Exactly what the topic says. The heads are a set off of a '89 Corvette, fully rebuilt. Just want to know if I might run into any problems with interchangability.

 

no EGR. 4 center intake bolts at different angle. Not a big deal.

------------------
-Tas
'89 Formula WS-6

305, TBI, 700R4, P.A.W. 14x3 open element with K&N, Milodon 160* thermo, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips, Hooker 1-5/8" 50 state legal headers, Dynomax 3" I pipe (PN 44063 and 43248)
Super GRK_Taz World
F-Body Dual Exaust
EFI & Intake Options

 

Watch out for computer tuning issues. That's the big problem that I had. Depending on what throttle body/intake/cam/etc. you go with you might be able to get through the swap without running into that problem.

-Mark W.
'88 SC Camaro w/ 305 TBI

 

no EGR? i thought the vettes had EGR. Is there no EGR holes in the heads? I'm gonna use the stock TBI unit probably with an early '80s Vette aluminum quadrajet intake modded to fit the TBI. THe cam will be a 210/220 duration cam @.050 with .480/.480 lift. What kinda computer issues might i run into?

 

They have an external EGR system that is tapped into the exaust manifolds. they don't have EGR holes in the head. Why use an '80s Vette intake? Unless its free, aftermarket intakes are much better.

------------------
-Tas
'89 Formula WS-6 made in Van Nuys, CA, U.S.A.

305, TBI, 700R4, P.A.W. 14x3 open element with K&N, Milodon 160* thermo, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips, Hooker 1-5/8" 50 state legal headers, Dynomax 3" I pipe (PN 44063 and 43248)
Super GRK_Taz World
F-Body Dual Exaust
EFI & Intake Options

 

If you're installing thsoe heads on a 305 your compression is going to take a nosedive. 305 heads have a smaller combustion chamber volume. There's also a possibility of the valves of the 350 head not having enough clearance in the 305's bore.

 

.

 

no. The 89 Vette had the aluminums. He's not talking about the f-body L98 (why its the same engine number I'll never know)

 

The head cc should be the same between the aluminum and the iron heads though, and that's where the problem lies.

 

nope. The aluminum L98 heads are 58cc. The L98 irons are bigger 64cc. Edelbrock makes some 60cc 50 state legal heads that NJ speeder is using. They have EGR ports in the head.


[This message has been edited by Tas (edited December 09, 2001).]

 

Yeah the Corvette L98 heads have 58cc chambers, I know that for sure. Tas, how can i get around the EGR issue, I'm not really familiar with this external EGR setup. The vette intake i got for free my dad replaced the quad on his hotrod with a holley and gave me the intake.

 

I have had both. They are 58cc chambers. there is a "knucle" in the chamber that adds just enough material to drop it to a 58cc. If you remove the "knucle" it bumps the cc's to 64. The trick with the EGR lies in the ECM. The L98 aluminum heads DO NOT have the EGR passage. However, the intake did. All of my parts were off of an 89 or 90 vette. I sold the Heads to Patrick, Aka Rouges91T/ARagtop, and after installing them on his car with edelbrock intake, and with Egr he always threw a code 32 because there was no passage in the head. This was also a Tpi car an he used the SD 1227730 ECM. Im asuming the same with A TBI.

Ran Like a bat outta hell though!

------------------
1990 RS
V8/A4
White/Primer ....Project in the works

1998 Z28
M6/!cags
MTI lid w/k&n
Magnaflow catback
HPP
Underdrive pulley

78 Chevy Fullsize
355 11:0:1
Trickflows, 282/282 .580/.580,, supercomps,torquer, holley 700 DP
Big Bad Sleeper

**Previous Rides**
1990 RS
1985 Berlinetta

[This message has been edited by Rock90rs (edited December 10, 2001).]

 

As long as you dont go enlarging the valve size its not going to be a problem. I beleive they wre 194/??? no problems there.

------------------
1990 RS
V8/A4
White/Primer ....Project in the works

1998 Z28
M6/!cags
MTI lid w/k&n
Magnaflow catback
HPP
Underdrive pulley

78 Chevy Fullsize
355 11:0:1
Trickflows, 282/282 .580/.580,, supercomps,torquer, holley 700 DP
Big Bad Sleeper

**Previous Rides**
1990 RS
1985 Berlinetta

 

I've got 'em on my L03 and I will confirm that there are no mechanical problems. They bolt up and the valves don't hit the cylinder walls.

-Mark W.
'88 SC Camaro w/ 305 TBI

 

damn how do I get around this EGR issue.. I already have the heads so I need to know how to maybe retain the EGR or scrap it totally....The car needs to pass the sniffer test..Mark305TBI how is your setup working?

 

I never got the computer tuning figured out. I eventually got Ed Wright at FastChip to burn me a custom chip. That helped alot but it was still not tuned quite right (not Ed's fault, how was he supposed to know what the engine wanted on the chip without having ever even seen it?). The car's been sitting in the garage for a while now waiting on the 650 double pumper that just arrived yesterday.
Fortunatly for me emmissions were not a concern so I just got rid of my EGR. I don't have any insight into how to get the external EGR working, sorry.

-Mark W.
'88 SC Camaro w/ 305 TBI

 

So if I scrap the EGR will I get a code thrown every time I start the car?

 

It will throw a code 32 when the conditions are right and the ECU tries to open the EGR valve. I just pulled the SES bulb. If you want to get into chip programming, you can disable the EGR on the chip and then it won't throw the code 'cause it won't ever try to open the EGR.

-Mark W.
'88 SC Camaro w/ 305 TBI

 

https://www.thirdgen.org/messgboard/...ML/002571.html

 

Is there any way I could somehow use the vette EGR setup with the exhaust manifolds on my TBI car, or is it special to the TPI base?

 

Dont know what to tell you about the EGR, its gonna have to be a custom setup of some sort. I might suggest a port into the back of the manifold near the TB somewheres (if theres space, maybe the side would work better) and mount the EGR somewhere else. Look for an EGR setup off another model of car that has the EGR and tube setup, like a Fiero or something along those lines.

The heads will need to have a hole drilled and tapped in the front of the head for the accessory bracket on the passenger head. The 'knuckle' or bump in the combustion chamber wont add 6cc's to the volume, its only about 2 if you remove it. The heads usually are lower than 58cc's anyway so it will more than likely hit 58-59 if that bump is gone.

 

Can I maybe fool the ECM into thinking I have an EGR valve when in fact I don't? I know if i don't have an EGR valve the ECM will retard the timing right? What about emissions? Does the EGR system really remove that much oxides of nitrogen? These heads are beginning to sound like a big hassle. I'm a high school student right now and I don't have a lot of time between work and school to dink around with my car, but I really want to do this. Are there any other heads you guys suggest maybe? I make minimun wage and I dont have a money tree in my back yard so my options are minimal, thats why I wanted to go with the L98s. Ahhhhh this is pissin me off