Will the exhaust manifolds from an 86 LG4 TPI IROC fit the y-pipe from an 84 L69?

Anyone have the casting numbers for the stock L69 exhaust manifolds?

JamesC

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No they will not. The LG4 manifold will practically fall into the hole in the L69 Y-pipe.

I'll see if I can remember to look at my old manifolds and get the #s...

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"So many Mustangs, so little time..."
ICON Motorsports

 

RB83L69,

As I understand it, the HO manifold outlets are 2 1/4 inches (vs the 2 inch non-HO LG4). The manifolds from an 86 IROC TPI are also 2 1/4. A trial fit, off car, looked promising. I'd certainly very much appreciate the numbers, however. I'm trying to get a bit more flow on the cheap--shoot the intermediate pipe at 2 3/4 is BIGGER than my aftermarket catback.

James

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I can't remember the whole PN's but the last 3 numbers for each are 063 and 064. They're the same for 350 TPI's, LB9 305/5-speed TPI's and the 305 HO L69's.

I got a set somewhere in my garage but they have the optional broken studs and plugged AIR fitting features.



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'89 Formula - Thunderchicken - 355 Vette L98/T-56/3.45 9-bolt/black/t-tops - the fun car!
'90 GTA - The GTA - 5.0 LB9/TH700/3.27 9-bolt/black/t-tops/tan leather - the cruiser.

 

Accdording to Camaro Performance Handbook, the TPI part #'s are 14094063 and 064. I quote, "These exhaust manifolds feature a 2-1/4" diameter outlet and can be used with 305 H.O. or 305 engines with throttle body injection. The TPI manifolds I have, however, are part #'s 14071200 RH and 14071188 LH; they do have the 2 1/4" outlet. Numbers from a L69 manifold would be great.

James

 

I have a set off my 90L98 and a set from an L69 car with the 4 bolt cat. I dont know what set goes to what car though it been so long sence i used them. The part numbers I have are 14094063 L.H. 14094064 R.H. The other set is 14071200 R.H., 1409463 L.H. I dont know why I have two of the 1409463, the matching number one should be 14071188 like you have.

If you have the 14071200 R.H. you have the better manifold of the two. It should flow alot better than the 14094064 R.H.

At the back of the manifold were it dumps into the exhuast pipe. The 14094064 necks down compared to the 14071200. Its a pretty big difference,Something like 3/4 of an inch. They both have the same opening size at the ports and head pipe. Its just right were the #8 port dumps into the end it necks down. I never noticed the difference till now.



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Black 90 IROC, L98, A4, 323 gear. SuperRamed 406 in the works!

 

I tried to use the set that I got from the L69 car on my 91 TBI car and they would not work with the stock LO3 exhaust. The LO3 manifolds were 1 3/4 inside diameter BTW.

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Black 90 IROC, L98, A4, 323 gear. SuperRamed 406 in the works!

 

Thanks, Mike,

Very helpful. I went to my GM dealership late this morning and had the parts man run the 14071200 RH #. I was told that that part # fit a 305, vin G, or 5.7. So apparently the manifolds in question, 14071200 RH / 14071188 LH, will work with an HO exhaust (different part # because of the neck?). Any comments or advice?

JamesC

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Hello, that's a trick question which can't be answered. What the hell is an '86 LG4 TPI!?!?!? LG4s are carb'ed, TPIs are LB9s, is that what you meant?

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George P. Lara
1984 Z28
2001 SS #0391
SCCA, SCFB, SC3GFB

 

Sounds like you have the right set. IM surprised to find out that the set from the 90 is the one that necks down. I dont have the 14071188 to compare too. But... I measured the 14094064 and the 14071200 they look identicle except for the part were the 064 necks down.

I think the two sets had slightly different air tubes. The bolt location and pattern is the same but the heights where the rubber part would connect is higher/lower.

Did you get the steel o ring gasket that goes with the R.H. manifold?

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Black 90 IROC, L98, A4, 323 gear. SuperRamed 406 in the works!

 

George, my mistake. The car is an LB9. Comments or advice?

Mike, no o ring, but the motor's still around. Is this something I should pick up?

James

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It goes between the manifold and the exhaust flange on the right side. The left one is cast into the manifold. Its a steel donut You will need it to seal the exhaust.

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Black 90 IROC, L98, A4, 323 gear. SuperRamed 406 in the works!

 

Hmmm.... my L69 has no such thing... it uses a flat surface on the manifold, and a flat surface on the top of the EFE valve, and the bottom of the EFE valve has a ball joint just like the left side manifold. Neither side uses any kind of gasket.

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"So many Mustangs, so little time..."
ICON Motorsports

 

Mike,

Gottcha. The manifold outlet is flat, but the the exhaust pipe has a flange, so I presume I'll need the donut. As you suggest, the left is cast.

James

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I wonder if the steel donut is used only on the EFI cars? It was like that on my 90 using basictly the same R.H. manifold as the L69. I bet the head pipes are longer on the EFI cars to reach the manifold and take up the slack when the EFE valve isnt used.

James..What are you working on a Carbed car?

The studs coming out of the L69 Manifold I have are 1/2 inch longer Than the one for the TPI. so that must be where the EFE valve would go.




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Black 90 IROC, L98, A4, 323 gear. SuperRamed 406 in the works!

 

Mike,

Yeah, carbed, 85 IROC LG4. The studs coming out of the TPI RH manifold is a bit over 3", the LH 2 1/2".

James

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One more question, guys,

Will the EFE from the LG4 swap to the L69?

James

By the way, I appreciate all the advice--where else but a board like this one could car guys help one another.

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OK... my 83 L69 RH manifold is 14071200, can't get to the casting # on the left because the heat stove is still on it. The right one doesn't have teh dimpled-in place, it's pretty flat all through there. Seems like LG4 manifolds in some applications also have that "feature".

The EFE valve is about ¾" tall or so.

OE EFE valves are different between the L69 and LG4. However I have been unable to find a L69-specific replacement one; they all say "305 all" which is damn near an ironclad guarantee that it won't be the right thing for a L69. However, the one that NAPA sells (I don't know offhand who actually makes it, maybe Dorman or somebody) has a very tall ball joint on it that is 2¼" near the body but necks down to 2". It also has the place where it fits between the studs made such that it will fit into the smaller space in the LG4 but will not fall out of the L69. So it will fit both systems, but is a restriction to the larger one.

I have taken mine and ground off the top ¼" or so of it, and ground out the inner diameter of the ball joint, to eliminate as much as possible the necked down area in there.

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"So many Mustangs, so little time..."
ICON Motorsports

 

RB83L69,

I did a bit of investigation at my dealership this morning. Apparently, there are two applications for the EFE: 1) LG4 and 2) F-body. If I've assembled all the info I've gathered correctly, F-body would include the HO, TPI, and throttle body cars (since all are supposed to have the same 2 1/4" manifold outlets and larger crossover pipes), and LG4 would be engine specific. Sounds plausible anyway.

JamesC

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By "ball joint", you mean the steel donut, right? Ha! I just ground down the inside of mine, too... the 2.8 V6's have those pieces between the manifold & y-pipe. A fellow V6'er told me there was nothing in the donut to grind; I'm glad someone else besides me found something.


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
---Think your car could be pic of the week? Visit http://www.f-body.net for details!

 

Tom,

The V8 cars don't use a "donut". The manifold flange (and the EFE valve as well) has a part of its casting that looks rather like half of a donut, and the pipes have a sort of flare and a loose flange that clamps the pipe to the cast "ball". But if the 6-cyl cars have donuts, and they're thicker than they need to be towards the center, then I can't see any reason not to hog them out!

James,

Sounds bellievable to me. Although, I didn't realize the TBI cars had the larger exhaust. I guess I never paid that part of them very much attention. So, maybe we should try to get EFE valves for later TPI cars, and that might actually be the larger one...

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"So many Mustangs, so little time..."
ICON Motorsports

 

Why didnt the 90 L98 TPI have the EFE valve on the right side? It came with just a steel half donut. Was the EFE valve used on the early EFI/carbed CARS only? Whats the EFE valve for?

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Black 90 IROC, L98, A4, 323 gear. SuperRamed 406 in the works!

 

Mike,

According to my 85 Camaro shop manual, "The EFE [eary fuel evaporation system] is used on "some" (my quotes) engines to provide a source of rapid heat to the engine induction system during cold driveaway. Rapid heating is desireable because it provides quick fuel evaportion and more uniform fuel distribution to aid cold driveability. It also reduces the length of time caburetor choking is required, so it reduces exhaust emissions."

James

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Oh, Okay...I found it in my chiltons also. So was that used only on the Carbed cars? Ive never see that used on the later TBI/TPI cars.

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Black 90 IROC, L98, A4, 323 gear. SuperRamed 406 in the works!

 

Man, get headers and a performance y-pipe plus a good cat-back. Have you looked at the stock GM y-pipes off of the L69 HO and the TPI cars....they are low performers at best.....I've had both types of cars and tossed both the stock manifolds and y-pipes as soon as I could and never looked back!

Sorry, just my .02 cents worth, I'll shut up now!

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Phil87IROC
Blue '87 IROC, 383 Crate Motor, KB pistons, AFR 190 heads, TPIS ZZ-9 cam, Edelbrock RPM intake, 1" TD spacer, Hooker SC/LT headers w/ Mufflex Y-pipe, Edelbrock 750 cfm Carb (#1411), Stock T-5, GM 3.42 gears w/Auburn posi.
Ohio Valley Dragstrip (KY) Trophy Bracket WINNER - 8.39 ET on a 1.82 sec. - 60'. Best MPH = 84.44. Still Tuning Carb!
Red '89 IROC L98, TES w/Flowmaster, 1LE DS, 700R4, T-Tops, K&Ns w/open air boxes, 160 T-stat, Hypertech Chip, gutted MAF & CAT, Jacobs Ign., 53kv coil, MSD wires.

[This message has been edited by Phil87IROC (edited August 09, 2001).]

[This message has been edited by Phil87IROC (edited August 09, 2001).]

 

Phil87IROC,

This swap is on the cheap. I'm not entirely sure, however, that this exhaust is low performance--I've heard of the L69 knocking off some 350s. At any rate, I already have an aftermarket high-flow cat and catback. I was surprise to find that the L69 intermediate pipe is 2 3/4" compared to my aftermarket 2 1/2". Moreover, the L69 manifolds and y-pipe offer much more flow than my stock LG4. All in all, I'm convinced that this set-up is considerably better than what I currently have and is probably better than 'some' aftermarket products.

James

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James,

If cost is a major concern then you are absolutely right on with your strategy and I commend you for wanting this upgrade in parts over the stock LG4 parts. I too am very cost conscience since I have a family to support along with my hobbies.

I had a new '84 Z28 with the L69 HO motor and the exhaust manifolds and pipes you described so I know what your goal is for sure. All I can say is that once you have driven a 3rd gen with long tubed tuned headers, a free flow exhaust, a five speed, and T-tops off, you'll never go back to anything close to stock, HO, 2-3/4", 064, 063 or not.

Good luck!

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Phil87IROC
Blue '87 IROC, 383 Crate Motor, KB pistons, AFR 190 heads, TPIS ZZ-9 cam, Edelbrock RPM intake, 1" TD spacer, Hooker SC/LT headers w/ Mufflex Y-pipe, Edelbrock 750 cfm Carb (#1411), Stock T-5, GM 3.42 gears w/Auburn posi.
Ohio Valley Dragstrip (KY) Trophy Bracket WINNER - 8.39 ET on a 1.82 sec. - 60'. Best MPH = 84.44. Still Tuning Carb!
Red '89 IROC L98, TES w/Flowmaster, 1LE DS, 700R4, T-Tops, K&Ns w/open air boxes, 160 T-stat, Hypertech Chip, gutted MAF & CAT, Jacobs Ign., 53kv coil, MSD wires.

[This message has been edited by Phil87IROC (edited August 09, 2001).]

 

Phil,

No doubt you're right. My old guy's come a long way already, however, on the cheap: L69 Dual snorkel with KN filter, tweeked air valve tension, bumped timing, AH secondary metering rods with G hanger, Summit cam, double roller timing chain, Edelbrock intake, 1LE drive shaft, 1LE 36mm hollow front and 24 mm solid rear stablizer bars, Global West SFCs, Spohn LCAs and panhard, high-flow cat and catback, and oh well hell, you get the idea. Much of this is on the salvage yard, secondhand cheap--which for me is much of the fun. Considering everything, would a high-performance exhaust really provide that much more zoom for the money? I don't know, maybe. Am I will to sink more money into an LG4. No. Down the road though a ZZ4 350 conversion is lurking.

James

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James I think you are right on target. I have
gone 14.2 with a near stock L69 through those
factory manifolds and exhaust. With the ZZ4
in mind your mods should be confined to either very cheap or transferable.......

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Tom K.
84 Z-28 M5 305 L69 HO
pulleys,coil,3:73(stock)
Jet chip, fan switch,
Al dshaft,1.6 rockers,
LCAs and brackets,BFG DRs
14.20 @ 96.74 2.02 60ft

 

Im a little confused about your exact question. A little FYI I think is in order:

No TPI cars had an EFE valve, there was just an empty cast iron housing identical to the EFE but no plate no holes nothing else.

The TPI manifolds and the L69 manifolds are the same deal size wise. If you are looking for some sort of power increase, a swap like that is a waste of time and money.

 

Madmax,

I'm considering swapping the L69/LB9 manifold (same part #) and exhaust system into an LG4 where I think I'll see some benefits over stock--and since, it's on the cheap ($68), why not? The EFE did, according to my 85 Camaro shop manual, come on the L69.

James

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[This message has been edited by JamesC (edited August 10, 2001).]

 

I see... well from what I hear and have read, you would need to use the L69 y-pipe. The manifolds alone wont help much with a tiny y-pipe anyway.

The L69 cars did have the EFE valve, and knowing GM there are no major differences in design.

 

Madmax,

As part of my $68 'deal,' I got the LB9 manifolds, the L69 y pipe, and the intermediary pipe (which is new looking).

JamesC

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I'll bet that there are many on this board that have a set of the manifolds you want just lyin' around somewhere, seein' as how so many have ditched theirs in favor of headers. You could save big bucks by buying a used set off someone -- they might even give 'em to ya!

Pursue that before buying new from GM.

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'87 IROC 5.7l TPI - original owner!

[This message has been edited by P J Moran (edited August 10, 2001).]

 

RB83L69, MikeH, and Madmax,

I thought I'd share this info for whatever it's worth. According the Alldata system, both carbed cars and EFI cars had EFE from 85-87. The carbed part # is 5234845 (LG4); the EFI part # is 5234840. I 'believe' the latter part # is also used on the L69 since the manifold outlet and y-pipe are the same size as the EFI manifold and y). No EFE is shown in 88.

James

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[This message has been edited by JamesC (edited August 11, 2001).]

 

Alldata is wrong then. I owned an 85 TPI car, and I own an 86, and I have worked on too many of them to count and believe me, there is no EFE valve on them.

 

Madmax,

I wouldn't presume to know if Alldata is correct or not. I did call my GM dealership with both parts #, and as I posted above, one was for carbed cars (LG4) and the other was simply listed as "F-body" (Alldata called it EFI) again, as I recall, through 87. When I do the swap down the road a bit, I'll order in the F-body/EFI version and see if Alldata is indeed incorrect--stranger things have happened! I'll let you know how it goes when the time comes.

JamesC

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[This message has been edited by JamesC (edited August 11, 2001).]

 

Guys,

The EFE GM part number for the L69 is 5234840. The number was listed under "F" body, which listed the "G" vin, 1983-1986.

JamesC

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And since this post has resurfaced i'll throw in my gains. As some of you may know, the speed density TPI 305s came w/ the small outlet TBI manifolds and Y pipe w/ 2.25" cat. Thats why they are rated at 205hp vs. the 230 of the N10 cars.
I went ahead and swapped to the bigger outlet manifolds and dual cats and picked up 2 tenths and 2.5mph (14.8 @ 93.1 now).
Granted, dual cats are better than the L69 or single 3" cat Y pipes, but still, there are gains even staying w/ stock pieces. Also, more might be had if you ported/polished the manifolds as well.

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Ed Maher - Moderator @ The TPI & Carb Boards
92 Z28 Convertible - Quasar blue / Tan top
305 TPI A4 2.73 - 14.8 @ 93.1
Stock except ported plenum and dual cats
-=ICON Motorsports=-

- Definitely prototypes, high powered mutants of some kind. Too weird to live, too cool to die