Search



Go Back   Third Generation F-Body Message Boards > Tech Boards > TPI
Register Forgot Password?

TPI Tuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.
Sponsored by South Bay Fuel Injectors
Click Here

Welcome to ThirdGen.org!
Welcome to ThirdGen.org.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join the ThirdGen.org community today!


Reply
 
Thread Tools Search this Thread
Old 12-05-2002, 12:20 PM   #1
Junior Member
 
Join Date: Aug 1999
Location: California City, CA, USA
Posts: 28

Classifieds Rating: (0)
LT1 heads on an L98

Is it possible to bolt a set of LT1 heads on an L98 motor? Anything special to know about before attempting this?
88 GTA is offline vBGarage Page   Reply With Quote
Old 12-05-2002, 12:25 PM   #2
Senior Member
 
Drkhrse89's Avatar
 
Join Date: Feb 2000
Location: Shakopee, Mn
Posts: 718
Car: 89 Iroc
Engine: 305TPI
Transmission: T5

Classifieds Rating: (1)

It wont work because the LT1 is reverse coolant flow if I remember rightly.
Drkhrse89 is offline vBGarage Page   Reply With Quote
Old 12-05-2002, 02:38 PM   #3
Senior Member
 
Join Date: Feb 2000
Location: Savannah, GA
Posts: 2,361
Car: 1997 Jeep Wrangler
Engine: 4.0L
Transmission: 5 speed
Axle/Gears: 8.8 rear, 4.56 gears, 4:1 transfer

Classifieds Rating: (1)

Yes, it's possible but not without modifications. It has to be machined to fit. Here's an article I got from a fellow member.

http://www.lt1intake.com/LT1_retrofit.htm
__________________
  • 1997 Jeep Wrangler
  • 1991 Honda TRX300
John Millican is offline vBGarage Page   Reply With Quote
Old 12-05-2002, 06:43 PM   #4
Senior Member
 
Join Date: May 2001
Location: FL
Posts: 784
Car: 1991 Z28 - 2000 Z28
Engine: L98 - LS4
Transmission: 700R4 - 4L60E
Axle/Gears: 3.23's - 3.73's

Classifieds Rating: (3)

It can & will work. I found a clean set of 95' LT1 heads for a song. Armed w/ only that article John has posted a link to - I had a local machinist friend do the conversion. It set me back a whopping $125. While some may argue that the ends might not justify the means... these heads went on a mild 357" motor w/ an LT1 intake. I have about $500 total in the heads... where can you get a practically "new" set of aluminum heads for $500?

This is what I invested as follows:
Used LT1 heads - $100
Conversion work - $125
3 angle valve job, mild bowl work, new seals - $303
__________________
1972 SS 454 4 spd Chevelle - F/S build in progress.
1991 Formula 350
1972 Monte Carlo - for sale
1991 Z28 5.7L - Sold, and missed.
2000 Z28 A4 - 10.777 @ 124.94 MPH - 1.511 60' - 10 second street car. SOLD
2001 Camaro SS - M6 #4948 473RWHP/437RWTQ - SOLD
86 IROC is offline vBGarage Page   Reply With Quote
Old 12-05-2002, 07:47 PM   #5
Junior Member
 
Join Date: Sep 2000
Location: Tampa, FL USA
Posts: 91
Car: 91 Camaro Z28
Engine: 5.7 TPI
Transmission: T-56

Classifieds Rating: (0)
Send a message via AIM to m23haz
John if you can put LT1 heads on pre-93 blocks then would the intake still have to be modified to fit?
__________________
1991 Z28 5.7L, T-56 w/ SLP clutch and LT4 PP, Eaton posi, 4.10's, Spohn Torque arm and crossmember, Edelbrock headers, SLP cat back exhaust, Eldebrock intake base, SLP runners, GMPP 1.6 roller rockers, , Accel 300+ race wires w/sleeve, MSD coil, relocated MAT, TB bypass, K&N's in gutted airbox
m23haz is offline vBGarage Page   Reply With Quote
Old 12-05-2002, 07:54 PM   #6
Supreme Member
 
Join Date: Nov 2001
Location: Ocean, NJ
Posts: 4,446
Car: Check The Sig

Classifieds Rating: (0)

Send a message via AIM to bigals87z28
i would think that they would have to be at least drilled for the dist. ..
__________________
[size="1"]87 Camaro Z28 LS1/4L60E Swap with a lot of other stuff
www.GMInsidenews.com
www.NJFBOA.org
bigals87z28 is offline vBGarage Page   Reply With Quote
Old 12-05-2002, 07:55 PM   #7
Senior Member
 
Join Date: May 2001
Location: FL
Posts: 784
Car: 1991 Z28 - 2000 Z28
Engine: L98 - LS4
Transmission: 700R4 - 4L60E
Axle/Gears: 3.23's - 3.73's

Classifieds Rating: (3)

You still need a hole for the distributor and outlets for water. Check the article out - they plug off the LT1 speciffic water passages and add a tube to route the water like a Pre-LT1 SBC head.
__________________
1972 SS 454 4 spd Chevelle - F/S build in progress.
1991 Formula 350
1972 Monte Carlo - for sale
1991 Z28 5.7L - Sold, and missed.
2000 Z28 A4 - 10.777 @ 124.94 MPH - 1.511 60' - 10 second street car. SOLD
2001 Camaro SS - M6 #4948 473RWHP/437RWTQ - SOLD
86 IROC is offline vBGarage Page   Reply With Quote
Old 12-05-2002, 08:31 PM   #8
Junior Member
 
Join Date: Sep 2000
Location: Tampa, FL USA
Posts: 91
Car: 91 Camaro Z28
Engine: 5.7 TPI
Transmission: T-56

Classifieds Rating: (0)
Send a message via AIM to m23haz
These heads make great power on the LT1 cars when ported. I think if I find a cheap set I might go for this.

86 Iroc: Did the heads increase power for you? Any track times or dyno or anything?
__________________
1991 Z28 5.7L, T-56 w/ SLP clutch and LT4 PP, Eaton posi, 4.10's, Spohn Torque arm and crossmember, Edelbrock headers, SLP cat back exhaust, Eldebrock intake base, SLP runners, GMPP 1.6 roller rockers, , Accel 300+ race wires w/sleeve, MSD coil, relocated MAT, TB bypass, K&N's in gutted airbox
m23haz is offline vBGarage Page   Reply With Quote
Old 12-05-2002, 08:44 PM   #9
Senior Member
 
Join Date: May 2001
Location: FL
Posts: 784
Car: 1991 Z28 - 2000 Z28
Engine: L98 - LS4
Transmission: 700R4 - 4L60E
Axle/Gears: 3.23's - 3.73's

Classifieds Rating: (3)

I don't have any results yet - the motor in question is in a state of limbo right now... I am selling the car that it was intended for. The heads & intake I bought came off of a good friend's 95' Z28 A4 car. W/ 245/50-16 Nitto DR's, a cut out, crank pulley, and a few free mods his car ran consistent 13.50's @ 101+. The motor I have has a bigger cam, roller rockers, 52mm TB, adj. FPR, & no doubt will blow through LT headers and true duals vs. LT1 manifolds & a stock exhaust. I chose these heads because I was able to do it on a budget, $100 here, another $125 there... you get the picture. It was either use the LT1's... or dump money into some iron L98 heads I have. The stock LT1's had an adequate valve spring for the cam I'm running, and to my fortune - they all tested out good when checked by the machine shop.
__________________
1972 SS 454 4 spd Chevelle - F/S build in progress.
1991 Formula 350
1972 Monte Carlo - for sale
1991 Z28 5.7L - Sold, and missed.
2000 Z28 A4 - 10.777 @ 124.94 MPH - 1.511 60' - 10 second street car. SOLD
2001 Camaro SS - M6 #4948 473RWHP/437RWTQ - SOLD
86 IROC is offline vBGarage Page   Reply With Quote
Old 12-05-2002, 10:45 PM   #10
Member
 
Join Date: Aug 2002
Location: Middle Georgia
Posts: 138

Classifieds Rating: (0)
John - do you have a machinist over near you that could modify a set of LT1 heads for me for about the same thing it cost 86 Iroc??

I just might be able to get a set from a friend off his blown motor for a song. (I just sold him a running LT1 for $700.00 so he owes me a deal.) I'd always heard this could be done, but figured it would cost a fortune, or that my local machinist either couldn't or wouldn't tackle it.
__________________
1989 Formula 350 / Dual Cats / Nine Bolt 3.27 Posi / 4 Wheel Discs
9.50 @74.5 mph in 1/8th at 73,000 miles - Bone Stock
9.50 @73.97 in 1/8th at 145,000 miles - Still Stock (except for K&N Filter)
9.44 @73.99 in 1/8th at 147,000 -Hooker 3" Cat Back Kit & Lakewood Lower Control Arms
9.24@75.44 in 1/8th @ 148,000 - char. cannister, smog pump, & MAF screens deleted - removed spare & jack, & junk (65 lbs.)
8.93 in 1/8th - - 13.89 @99.9 MPH in 1/4 @150,000k - cheap ($80) Summit headers, Flowmaster y-collector, Soon to Come - 1.6:1 roller-tip rockers
89Formula350WS6 is offline vBGarage Page   Reply With Quote
Old 12-06-2002, 09:41 AM   #11
Senior Member
 
mystikkal_69's Avatar
 
Join Date: Jul 2001
Location: San Antonio, TX
Posts: 1,823
Car: 1988 IROC-Z
Engine: L98 (350 TPI)
Transmission: MD8 (700 R4) + 3.42 LS1 Rear

Classifieds Rating: (2)

Send a message via Yahoo to mystikkal_69
LT1 Heads + LT1 Intake on a Gen 1 SBC = intresting.....


keep the ideas rolling.:hail:
mystikkal_69 is offline vBGarage Page   Reply With Quote
Old 12-06-2002, 09:56 AM   #12
Senior Member
 
Join Date: May 2001
Location: FL
Posts: 784
Car: 1991 Z28 - 2000 Z28
Engine: L98 - LS4
Transmission: 700R4 - 4L60E
Axle/Gears: 3.23's - 3.73's

Classifieds Rating: (3)

89Formula350WS6 - If you want, I will talk to Dan, the machinist. If he is interested in doing another set, I will privately email you his home # and the best times to reach him. Dan is the inventor of the C4 to flathead adapter, he created it while working for Challenger Equipment in California. As long as I've known Dan through my father - he's always had something off the wall being built in his shop. The guy is a whiz.
__________________
1972 SS 454 4 spd Chevelle - F/S build in progress.
1991 Formula 350
1972 Monte Carlo - for sale
1991 Z28 5.7L - Sold, and missed.
2000 Z28 A4 - 10.777 @ 124.94 MPH - 1.511 60' - 10 second street car. SOLD
2001 Camaro SS - M6 #4948 473RWHP/437RWTQ - SOLD
86 IROC is offline vBGarage Page   Reply With Quote
Old 12-06-2002, 09:57 AM   #13
Junior Member
 
Join Date: Aug 1999
Location: California City, CA, USA
Posts: 28

Classifieds Rating: (0)
Thanks for all the good info. What are the casting numbers on LT1 heads?
88 GTA is offline vBGarage Page   Reply With Quote
Old 12-06-2002, 11:24 AM   #14
Senior Member
 
Drkhrse89's Avatar
 
Join Date: Feb 2000
Location: Shakopee, Mn
Posts: 718
Car: 89 Iroc
Engine: 305TPI
Transmission: T5

Classifieds Rating: (1)

Well looks like I shot myself in the foot. This is great I am looking into a set of heads for my new motor and I think that I just found what I am going to be doing if I can find someone around here to do the conversion.
Drkhrse89 is offline vBGarage Page   Reply With Quote
Old 12-06-2002, 12:38 PM   #15
Junior Member
 
Join Date: Sep 2000
Location: Tampa, FL USA
Posts: 91
Car: 91 Camaro Z28
Engine: 5.7 TPI
Transmission: T-56

Classifieds Rating: (0)
Send a message via AIM to m23haz
Are all of the LT1 heads aluminum? I thought that some of them were iron.

Was that $125 price for the head conversion a "favor" to you or is that what others should expect as far as amount of time and work needed to do the conversion.
Thanks
__________________
1991 Z28 5.7L, T-56 w/ SLP clutch and LT4 PP, Eaton posi, 4.10's, Spohn Torque arm and crossmember, Edelbrock headers, SLP cat back exhaust, Eldebrock intake base, SLP runners, GMPP 1.6 roller rockers, , Accel 300+ race wires w/sleeve, MSD coil, relocated MAT, TB bypass, K&N's in gutted airbox
m23haz is offline vBGarage Page   Reply With Quote
Old 12-06-2002, 12:48 PM   #16
Junior Member
 
Join Date: Aug 1999
Location: California City, CA, USA
Posts: 28

Classifieds Rating: (0)
LT1 heads came in both aluminum and iron. I believe the Impala's, caprice's, etc came with the iron version.
88 GTA is offline vBGarage Page   Reply With Quote
Old 12-06-2002, 01:48 PM   #17
Senior Member
 
Join Date: May 2001
Location: FL
Posts: 784
Car: 1991 Z28 - 2000 Z28
Engine: L98 - LS4
Transmission: 700R4 - 4L60E
Axle/Gears: 3.23's - 3.73's

Classifieds Rating: (3)

That $125 price wasn't a favor - but I'm sure it helps that I have known him for almost 20 years. You are correct about the heads - B body's got cast LT1 heads, and Y & F cars got aluminum LT1's. I was told by a few LT1 guys that I should avoid 92' & 93 castings.
__________________
1972 SS 454 4 spd Chevelle - F/S build in progress.
1991 Formula 350
1972 Monte Carlo - for sale
1991 Z28 5.7L - Sold, and missed.
2000 Z28 A4 - 10.777 @ 124.94 MPH - 1.511 60' - 10 second street car. SOLD
2001 Camaro SS - M6 #4948 473RWHP/437RWTQ - SOLD
86 IROC is offline vBGarage Page   Reply With Quote
Old 12-06-2002, 04:39 PM   #18
Senior Member
 
Drkhrse89's Avatar
 
Join Date: Feb 2000
Location: Shakopee, Mn
Posts: 718
Car: 89 Iroc
Engine: 305TPI
Transmission: T5

Classifieds Rating: (1)

So would this work with a TPI intake or are you limited to running just a LT1 intake?
Drkhrse89 is offline vBGarage Page   Reply With Quote
Old 12-06-2002, 05:01 PM   #19
Junior Member
 
Join Date: Sep 2000
Location: Tampa, FL USA
Posts: 91
Car: 91 Camaro Z28
Engine: 5.7 TPI
Transmission: T-56

Classifieds Rating: (0)
Send a message via AIM to m23haz
Well since the LT1 intake ports line up to l98 heads I assume that you could use the TPI on LT1 heads that have been modified to the early style.
__________________
1991 Z28 5.7L, T-56 w/ SLP clutch and LT4 PP, Eaton posi, 4.10's, Spohn Torque arm and crossmember, Edelbrock headers, SLP cat back exhaust, Eldebrock intake base, SLP runners, GMPP 1.6 roller rockers, , Accel 300+ race wires w/sleeve, MSD coil, relocated MAT, TB bypass, K&N's in gutted airbox
m23haz is offline vBGarage Page   Reply With Quote
Old 12-06-2002, 05:50 PM   #20
Senior Member
 
Join Date: Feb 2000
Location: Savannah, GA
Posts: 2,361
Car: 1997 Jeep Wrangler
Engine: 4.0L
Transmission: 5 speed
Axle/Gears: 8.8 rear, 4.56 gears, 4:1 transfer

Classifieds Rating: (1)

Quote:
Originally posted by 89Formula350WS6
John - do you have a machinist over near you that could modify a set of LT1 heads for me for about the same thing it cost 86 Iroc??

,,,,,,,,.
Sorry, I don't know any machinest's around here where I am.
__________________
  • 1997 Jeep Wrangler
  • 1991 Honda TRX300
John Millican is offline vBGarage Page   Reply With Quote
Old 12-11-2002, 10:03 AM   #21
Supreme Member
 
Join Date: Aug 1999
Location: Northern NJ
Posts: 1,386
Car: 89 Formula / 09 G8
Engine: LS1 / LS3
Transmission: M6 / M6
Axle/Gears: 3:42 / 3:27

Classifieds Rating: (1)

Would someone like to post some flow numbers for the LT1 heads?
Omega is offline vBGarage Page   Reply With Quote
Old 12-16-2002, 11:58 PM   #22
Member
 
Join Date: Aug 2002
Location: Middle Georgia
Posts: 138

Classifieds Rating: (0)
Thanks for the reply John.

86 Iroc, I'd be interested in the conversion if you can get me some more info on the cost involved if I have a set of good used heads.

Omega, You can find those flow numbers at Chevy High Performance's web site under the "Flow To Go" article.
Maybe one of the most useful series of articles ever written. You've gotta love that they put the specs online for the world to see even if you aren't a subscriber.
__________________
1989 Formula 350 / Dual Cats / Nine Bolt 3.27 Posi / 4 Wheel Discs
9.50 @74.5 mph in 1/8th at 73,000 miles - Bone Stock
9.50 @73.97 in 1/8th at 145,000 miles - Still Stock (except for K&N Filter)
9.44 @73.99 in 1/8th at 147,000 -Hooker 3" Cat Back Kit & Lakewood Lower Control Arms
9.24@75.44 in 1/8th @ 148,000 - char. cannister, smog pump, & MAF screens deleted - removed spare & jack, & junk (65 lbs.)
8.93 in 1/8th - - 13.89 @99.9 MPH in 1/4 @150,000k - cheap ($80) Summit headers, Flowmaster y-collector, Soon to Come - 1.6:1 roller-tip rockers
89Formula350WS6 is offline vBGarage Page   Reply With Quote
Old 12-17-2002, 12:19 AM   #23
Senior Member
 
Join Date: May 2001
Location: FL
Posts: 784
Car: 1991 Z28 - 2000 Z28
Engine: L98 - LS4
Transmission: 700R4 - 4L60E
Axle/Gears: 3.23's - 3.73's

Classifieds Rating: (3)

89Formula350WS6 - I've got a call in to dan for m23haz. Dan said he'd have to get back to me in a few weeks because he is super busy w/ x-mas and his family. I don't want to push him or he won't want to do them. So, I'm going to let him take his time getting back to me about it and see what he says. I'm pretty sure he'll do them... but it's going to be on his terms and most likely not until next year when the holidays are over.
__________________
1972 SS 454 4 spd Chevelle - F/S build in progress.
1991 Formula 350
1972 Monte Carlo - for sale
1991 Z28 5.7L - Sold, and missed.
2000 Z28 A4 - 10.777 @ 124.94 MPH - 1.511 60' - 10 second street car. SOLD
2001 Camaro SS - M6 #4948 473RWHP/437RWTQ - SOLD
86 IROC is offline vBGarage Page   Reply With Quote
Old 12-17-2002, 08:12 AM   #24
TGO Supporter
 
89gta383's Avatar
 
Join Date: Feb 2000
Location: St. Augustine, FL
Posts: 1,600
Car: 89 GTA
Engine: 383
Transmission: 700R4
Axle/Gears: 9 bolt-3.73

Classifieds Rating: (5)

Head flow for LT1:

http://www.malcams.com/legacy/misc/headflow.htm
__________________
89 Trans Am GTA
89 Formula
89gta383 is offline vBGarage Page   Reply With Quote
Old 12-17-2002, 09:15 AM   #25
Member
 
Join Date: Aug 2002
Location: Middle Georgia
Posts: 138

Classifieds Rating: (0)
Thanks Iroc. I'm in no hurry at all.

89gta383: Thanks for posting those flow numbers. For the LT1 heads that's much more complete than the CHP listing.
__________________
1989 Formula 350 / Dual Cats / Nine Bolt 3.27 Posi / 4 Wheel Discs
9.50 @74.5 mph in 1/8th at 73,000 miles - Bone Stock
9.50 @73.97 in 1/8th at 145,000 miles - Still Stock (except for K&N Filter)
9.44 @73.99 in 1/8th at 147,000 -Hooker 3" Cat Back Kit & Lakewood Lower Control Arms
9.24@75.44 in 1/8th @ 148,000 - char. cannister, smog pump, & MAF screens deleted - removed spare & jack, & junk (65 lbs.)
8.93 in 1/8th - - 13.89 @99.9 MPH in 1/4 @150,000k - cheap ($80) Summit headers, Flowmaster y-collector, Soon to Come - 1.6:1 roller-tip rockers
89Formula350WS6 is offline vBGarage Page   Reply With Quote
Old 12-17-2002, 09:28 AM   #26
Moderator
 
Vader's Avatar
 
Join Date: Jan 2000
Posts: 17,911

Classifieds Rating: (0)

Not to confuse the issue even more, but the iron heads actually flow better in stock form (as cast) than the aluminum heads on the intake side, and are fairly close on the exhaust side. Iron heads are easier to work with (IMO) and can probably be acquired for less cash outlay than their aluminum counterparts.

I did some bowl, runner, and radius work on my '94 iron heads when the 2.02/1.60 valves were installed, and noticed an immediate increase in pull to a much higher RPM. The intake runners were increased from an average of 174cc to 196cc, and the exhust runners were opened from 68cc to 76cc. Compression was bumped to 10.6 from the larger valves being installed deeper by 0.010" (1.770" installed height). With a few little associated changes to enhance the package (cam, springs, exhaust, intake porting, etc.), the RW HP/TQ went from 256/328 to 378/455. Not bad for a little home porting and some "lame" iron heads, huh? Of course, the aluminum heads probably would have been a LOT better, or at least that's the standard assumption.
__________________
Later,
Vader
- - - - - - - - - - - - - - - - - -
"Everything should be made as simple as possible, and not one step simpler."
Vader is offline vBGarage Page   Reply With Quote
Old 12-17-2002, 10:16 AM   #27
Senior Member
 
quickL98's Avatar
 
Join Date: Jul 2000
Location: helldon, fl
Posts: 386
Car: 87 trans am GTA
Engine: tesla permanent magnet
Transmission: 93 T-56
Axle/Gears: moser 12bolt w/ 3.73

Classifieds Rating: (2)
Send a message via AIM to quickL98
i've got a set of ported '96 vette heads with gmpp springs guide plates and all sitting in a box in the dining room, i been sayung i'm going to put them on my '94Z but i still cant locate the motor when i pop the hood

picked them up for under 600 bones.... ot bad for a set of clean worked up heads.
__________________
87gta !modded!
oooold combo 12.94 @ 112 (ltr's and auto)
98 T/A corsa,SLPra,Fikse profil 5's 17x9,18x10's
09 G8 GXP 6m
06 "busa"
quickL98 is offline vBGarage Page   Reply With Quote
Old 12-18-2002, 02:20 AM   #28
jmd
Supreme Member
 
Join Date: Jul 2000
Location: Aridzona
Posts: 4,586
Car: `86 SS / `87 SS
Engine: L69 w/ TPI on top / 305 4bbl
Transmission: `95 T56 \ `88 200-4R

Classifieds Rating: (2)

Send a message via ICQ to jmd
Quote:
Originally posted by m23haz
Well since the LT1 intake ports line up to l98 heads
No they don't. Close, but mismatched. Go for the LT1 intake if you go with LT1 heads.
jmd is offline vBGarage Page   Reply With Quote
Old 12-19-2002, 08:46 AM   #29
Senior Member
 
Jekyll & Hyde's Avatar
 
Join Date: Sep 2002
Location: Dallas/Fort-Worth
Posts: 1,497
Car: 1988 Camaro IROC-Z
Engine: 350 TPI (L98)
Transmission: T56
Axle/Gears: 9-bolt 3.45

Classifieds Rating: (0)

That would mean that the LT1 intake would not match up with the head ports then right? Anyone absolutly sure that they will not line up? Maybe some work on the base manifold.
Jekyll & Hyde is offline vBGarage Page   Reply With Quote
Old 12-19-2002, 10:40 AM   #30
jmd
Supreme Member
 
Join Date: Jul 2000
Location: Aridzona
Posts: 4,586
Car: `86 SS / `87 SS
Engine: L69 w/ TPI on top / 305 4bbl
Transmission: `95 T56 \ `88 200-4R

Classifieds Rating: (2)

Send a message via ICQ to jmd
Quote:
Originally posted by Maroon-IROC-Z
That would mean that the LT1 intake would not match up with the head ports then right? Anyone absolutly sure that they will not line up? Maybe some work on the base manifold.
They kinda line up and all, it's just that there is port mismatch. There's just not much point of a TPI intake on LT1 heads.
jmd is offline vBGarage Page   Reply With Quote
Old 12-19-2002, 12:32 PM   #31
Senior Member
 
Join Date: Mar 2002
Location: Somewhere over the rainbow
Posts: 792

Classifieds Rating: (0)
I think I read that there is a problem with the accessory holes in
the ends of the heads. Like one of the holes is missing or in a
different location or something. Is there any truth to that?
Swapmaster is offline vBGarage Page   Reply With Quote
Old 12-19-2002, 12:43 PM   #32
jmd
Supreme Member
 
Join Date: Jul 2000
Location: Aridzona
Posts: 4,586
Car: `86 SS / `87 SS
Engine: L69 w/ TPI on top / 305 4bbl
Transmission: `95 T56 \ `88 200-4R

Classifieds Rating: (2)

Send a message via ICQ to jmd
Click the image to open in full size.

Click the image to open in full size.

Who wants to post 86-down & 87-92 heads?

Last edited by jmd; 12-19-2002 at 03:42 PM.
jmd is offline vBGarage Page   Reply With Quote
Old 12-19-2002, 03:36 PM   #33
Senior Member
 
Join Date: Mar 2002
Location: Somewhere over the rainbow
Posts: 792

Classifieds Rating: (0)
This is an 88 vette head.
Attached Images
File Type: jpg mvc-001s.jpg (18.5 KB, 999 views)
Swapmaster is offline vBGarage Page   Reply With Quote
Old 12-19-2002, 03:38 PM   #34
Senior Member
 
Join Date: Mar 2002
Location: Somewhere over the rainbow
Posts: 792

Classifieds Rating: (0)
Are those water outlets in the front of those heads and are they
threaded?
Swapmaster is offline vBGarage Page   Reply With Quote
Old 12-19-2002, 03:42 PM   #35
jmd
Supreme Member
 
Join Date: Jul 2000
Location: Aridzona
Posts: 4,586
Car: `86 SS / `87 SS
Engine: L69 w/ TPI on top / 305 4bbl
Transmission: `95 T56 \ `88 200-4R

Classifieds Rating: (2)

Send a message via ICQ to jmd
outlets no, not used as outlets if that's what you meant. threaded plugs to the water jackets yes.
jmd is offline vBGarage Page   Reply With Quote
Old 12-19-2002, 03:51 PM   #36
Senior Member
 
Join Date: Mar 2002
Location: Somewhere over the rainbow
Posts: 792

Classifieds Rating: (0)
Here is a shot of the 1989 head. The water passages at the ends
of the head appear to be about the same as the passages on the
LT1 heads that the guy in the article blocked off.

If this is the case then I would not worry about them.
Attached Images
File Type: jpg mvc-002s.jpg (32.9 KB, 1000 views)
Swapmaster is offline vBGarage Page   Reply With Quote
Old 12-19-2002, 04:09 PM   #37
Senior Member
 
Join Date: Mar 2002
Location: Somewhere over the rainbow
Posts: 792

Classifieds Rating: (0)
One thing I notice missing from the LT1 heads are the oil return
holes. How do they get the oil drained from the top of the head?

On the picture above they are the holes just below the water
passages on either end of the head.

Last edited by Swapmaster; 12-19-2002 at 04:36 PM.
Swapmaster is offline vBGarage Page   Reply With Quote
Old 12-19-2002, 04:41 PM   #38
Senior Member
 
Join Date: Mar 2002
Location: Somewhere over the rainbow
Posts: 792

Classifieds Rating: (0)
jmd, could you put up a pic of the bottom of your head so we can
see the water passages?
Swapmaster is offline vBGarage Page   Reply With Quote
Old 12-20-2002, 01:39 PM   #39
Senior Member
 
Join Date: Jun 2000
Location: the garage
Posts: 1,609
Car: 84 SVO
Engine: Volvo headed 2.3T
Transmission: WCT5
Axle/Gears: 8.8" 3.73

Classifieds Rating: (0)

Send a message via ICQ to SATURN5
courtsey of Ebay..

Click the image to open in full size.


It looks like the passage on the LT1 at the corners will need a sleeve to pass water to the intake, but other than that, it looks the same.

Last edited by SATURN5; 12-20-2002 at 01:53 PM.
SATURN5 is offline vBGarage Page   Reply With Quote
Old 12-20-2002, 02:51 PM   #40
Senior Member
 
Join Date: Mar 2002
Location: Somewhere over the rainbow
Posts: 792

Classifieds Rating: (0)
This is an LT1 gasket on an L98 block. Notice the overlap of the
water passages into the lifter valley.
Attached Images
File Type: jpg mvc-002s.jpg (27.9 KB, 941 views)
Swapmaster is offline vBGarage Page   Reply With Quote
Old 12-20-2002, 02:56 PM   #41
Senior Member
 
Join Date: Mar 2002
Location: Somewhere over the rainbow
Posts: 792

Classifieds Rating: (0)
Here is a closer shot. The opening above the water passage is
the oil drainback hole. This is the only mismatch I see. You could
either have the passages in the heads welded shut or have
material welded to the block in those corners to seal it up.
Attached Images
File Type: jpg mvc-004s.jpg (32.8 KB, 938 views)
Swapmaster is offline vBGarage Page   Reply With Quote
Old 12-20-2002, 03:25 PM   #42
Senior Member
 
Join Date: Mar 2002
Location: Somewhere over the rainbow
Posts: 792

Classifieds Rating: (0)
As far as getting coolant back out of the engine, I am thinking
instead of having coolant outlets put into the LT1 intake and
drilling and putting sleeves into the heads to match, why not
put our outlets in the back of the heads where they have the
plugs going into the water jackets. Just run your hoses from the
back of the heads to the remote thermostat housing. Then all
you would have to do is have the LT1 intake modified for the
distributor.
Swapmaster is offline vBGarage Page   Reply With Quote
Old 12-20-2002, 03:49 PM   #43
Senior Member
 
Join Date: Mar 2002
Location: Somewhere over the rainbow
Posts: 792

Classifieds Rating: (0)
I know the LT1 pulls coolant out through the water pump but
where does the coolant enter the engine at?
Swapmaster is offline vBGarage Page   Reply With Quote
Old 12-20-2002, 05:14 PM   #44
jmd
Supreme Member
 
Join Date: Jul 2000
Location: Aridzona
Posts: 4,586
Car: `86 SS / `87 SS
Engine: L69 w/ TPI on top / 305 4bbl
Transmission: `95 T56 \ `88 200-4R

Classifieds Rating: (2)

Send a message via ICQ to jmd
Quote:
Originally posted by Swapmaster
I know the LT1 pulls coolant out through the water pump but
where does the coolant enter the engine at?

The thermostat controls the incoming of water. The lower radiator hose goes from the PS tank in the radiator and flows water to the water pump in a normal position.

The upper radiator hose goes from the water pump to the DS tank in the radiator.

To answer your question, water goes into the engine at the block, and turns 90 degrees to go directly to the heads.

Matthew
jmd is offline vBGarage Page   Reply With Quote
Old 12-20-2002, 05:19 PM   #45
jmd
Supreme Member
 
Join Date: Jul 2000
Location: Aridzona
Posts: 4,586
Car: `86 SS / `87 SS
Engine: L69 w/ TPI on top / 305 4bbl
Transmission: `95 T56 \ `88 200-4R

Classifieds Rating: (2)

Send a message via ICQ to jmd
Quote:
Originally posted by Swapmaster
As far as getting coolant back out of the engine, I am thinking
instead of having coolant outlets put into the LT1 intake and
drilling and putting sleeves into the heads to match, why not
put our outlets in the back of the heads where they have the
plugs going into the water jackets. Just run your hoses from the
back of the heads to the remote thermostat housing. Then all
you would have to do is have the LT1 intake modified for the
distributor.

If you're talking about Gen II LT1 heads on a Gen I block, that would work. Accessories would have to be clear of it, which is obstacle numero uno. You'd have to thermostat control the water coming out of the heads, which is obstacle numero dos; not a big deal though.
jmd is offline vBGarage Page   Reply With Quote
Old 12-20-2002, 08:02 PM   #46
Junior Member
 
Join Date: Sep 2000
Location: Tampa, FL USA
Posts: 91
Car: 91 Camaro Z28
Engine: 5.7 TPI
Transmission: T-56

Classifieds Rating: (0)
Send a message via AIM to m23haz
So in addition to doing what the article says I would also have to fill those holes that overlap in the picture? What if those holes werent filled in, what would happen?
__________________
1991 Z28 5.7L, T-56 w/ SLP clutch and LT4 PP, Eaton posi, 4.10's, Spohn Torque arm and crossmember, Edelbrock headers, SLP cat back exhaust, Eldebrock intake base, SLP runners, GMPP 1.6 roller rockers, , Accel 300+ race wires w/sleeve, MSD coil, relocated MAT, TB bypass, K&N's in gutted airbox
m23haz is offline vBGarage Page   Reply With Quote
Old 12-20-2002, 09:21 PM   #47
Senior Member
 
Join Date: Jun 2000
Location: the garage
Posts: 1,609
Car: 84 SVO
Engine: Volvo headed 2.3T
Transmission: WCT5
Axle/Gears: 8.8" 3.73

Classifieds Rating: (0)

Send a message via ICQ to SATURN5
Quote:
Originally posted by m23haz
So in addition to doing what the article says I would also have to fill those holes that overlap in the picture? What if those holes werent filled in, what would happen?

The modifications in the article take care of the holes. The plugs that are pressed into the face of the head will cover the holes. The 3/16th hole thats drilled into the plug is the water passage. To use a standard intake the intake port side of the head will need modifed per the article. Using a LT1 intake may provide a different option.
__________________
Bob
84 SVO B234F 16V Volvo head conversion, RPE custom intake, header, FMIC, 38MM BOV, RPE modified diamond pistons, Crower rods, HE351 Holset, 44MM WG/dump, A1000/sumped tank, -8AN lines, T-tops
96 Mark VIII "The overstuffed Cobra" Black/grey, drilled/slotted brakes, FRPP built 4r70W, FRPP converter
RAW Performance Engineering
SATURN5 is offline vBGarage Page   Reply With Quote
Old 12-21-2002, 12:57 AM   #48
Senior Member
 
Join Date: Mar 2002
Location: Somewhere over the rainbow
Posts: 792

Classifieds Rating: (0)
The idea I have is to use the LT1 heads and intake together.
Weld the coolant passages in the heads and drill the new 3/16th
hole as the article states. Only do the distributor modification to
the intake manifold. This will bolt the heads and intake to the
L98 block and mount the distributor.

The next issue is creating a way to get the coolant out of the
engine and to a remote thermostat housing as with a standard
LT1 intake swap. I think the most logical way to do this is to use
the hole that is already provided in the end of the head which
has the plug in it. Drill and tap it for a 3/4" NPT nipple and screw
nipples into them to route 3/4" heater hoses to the remote
thermostat housing with the outles in the head at the back of the
engine of course.

Presto, you now have Gen II LT1 heads and intake on your L98
engine.

The cast iron version heads from a Caprice that Vader taked
about flow 230fm on the intake and 147cfm on the exhaust
at .500" lift. I don't know if these numbers are actual but are the
only numbers I could find on this head. The aluminum version from
a Camaro flow 213cfm on the intake and 142cfm on the exhaust.

So as Vader states, the cast version outflows the aluminum heads
quite a bit. The cast heads have a cast# of 10125320 and were
used on 94-96 Caprice, Roadmaster and Fleetwood cars.
I checked availability and found them all over the country in
salvage yards. I ordered a cast iron pair today from a yard in
Missouri for $150 to speculate with. I figure that if this works, it
will be a low cost head and intake setup that most anyone can
afford to do.

Does anyone see any problems with this idea?

Last edited by Swapmaster; 12-21-2002 at 01:10 AM.
Swapmaster is offline vBGarage Page   Reply With Quote
Old 12-21-2002, 01:48 AM   #49
Junior Member
 
Join Date: Sep 2000
Location: Tampa, FL USA
Posts: 91
Car: 91 Camaro Z28
Engine: 5.7 TPI
Transmission: T-56

Classifieds Rating: (0)
Send a message via AIM to m23haz
So when you do the swap you use L98 head gaskets not the LT1 right?

Swapmaster: Why not just modify the heads for that coolant sleeve like in the article and then get the Lt1 intake modified for the coolant passages like John does to save you the trouble of figuring out how to run stuff without the modifications? It would then match up perfectly and you dont have to worry about running the lines out of the back of the heads.
__________________
1991 Z28 5.7L, T-56 w/ SLP clutch and LT4 PP, Eaton posi, 4.10's, Spohn Torque arm and crossmember, Edelbrock headers, SLP cat back exhaust, Eldebrock intake base, SLP runners, GMPP 1.6 roller rockers, , Accel 300+ race wires w/sleeve, MSD coil, relocated MAT, TB bypass, K&N's in gutted airbox
m23haz is offline vBGarage Page   Reply With Quote
Old 12-21-2002, 11:33 AM   #50
Senior Member
 
Join Date: Mar 2002
Location: Somewhere over the rainbow
Posts: 792

Classifieds Rating: (0)
Yes, you would use the L98 head gaskets. I am looking for the
easiest way of doing this. The heads already have holes tapped
into the water jackets in the ends so why not use them. They may
already be big enough to screw a 90 degree nipple into them but
if not they can easily be drilled bigger for a 3/4" nipple. You could
even screw 90 degree 3/4" AN fittings onto them to use braided
lines so you would never have to worry about them.

Here is a pic of an LT1 intake gasket sitting on top of a Felpro
1205 gasket. The LT1 gasket will not support the use of a coolant
passage. The gasket is not wide enough to cover a coolant port if
one were added. So the outlets in the back of the heads are the
easiest way to go. Another note is the runner ports on the LT1
gasket match the Felpro 1205/Victor 95070 gasket perfectly.
Attached Images
File Type: jpg mvc-002s.jpg (25.3 KB, 871 views)
Swapmaster is offline vBGarage Page   Reply With Quote
Old 12-21-2002, 11:33 AM
ThirdGen
1992 Camaro




Paid Advertisement


Reply

Go Back   Third Generation F-Body Message Boards > Tech Boards > TPI

Tags
block, cool, coolant, engines, filling, first, head, heads, hose, install, l98, line, lt1, passages, water
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 


1982 Camaro '82 || 1983 Camaro '83 || 1984 Camaro '84 || 1985 Camaro '85 || 1986 Camaro '86 || 1987 Camaro '87 || 1988 Camaro '88 || 1989 Camaro '89 || 1990 Camaro '90 || 1991 Camaro '91 || 1992 Camaro '92


All times are GMT -5. The time now is 05:04 PM.


Powered by vBulletin® Version 3.7.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
All content copyright 1997 - 2014 ThirdGen.org. All rights reserved. No part of this website may be reproduced without the expressed, documented, and written consent of ThirdGen.org's Administrators.

Emails & Contact Details