kenf729

iTrader: (3)

ok, working on a tight budget, so I just bought this 89 RS with no engine or tranny, already had a 350 built stock and picked up a 6L40, now my question is this: there is an exhaust system in the car, what I need is exhaust manifolds that will bolt on the 350 and utilize the stock pipes...

can anybody tell me what I need to get?

also I think the car had a 305 in it...

later on maybe a year or two I may look into headers, but for now just going stock.

thank you,
Ken

Air_Adam

The 350 and 305 can both use the same manifolds. What you need to find are just any stock V8 F-body exhaust manifolds. The ones from the LG4 and L03 (the low HP V8s) used a smaller exhaust manifold, and the L69 and 5.7 TPI (high output V8s) used a manifold that looked the same, but had bigger passages inside and a bigger outlet.

The best thing to find would be some exhaust manifolds from an L69 (305 HO 4bbl) or a 5.7 TPI for your engine. They will bolt up to the stock exhaust system you have now, but breathe a little bit better than the other exhaust manifolds, although either set of manifolds will work.

kenf729

iTrader: (3)

Air_Adam thanks for the quick reply, I'm making the assumption that LG4 and LO3 are engine types, as the L69 and 5.7 TPI are a higher HP engine? So when going to a u-pull it, what should I look for? also note my 350 will be carb'd not that computerized stuff....

meridius

You can look at the vin of the car, the eighth digit to be exact, and you will want to see either a G which is for the 5.0 High Output (L69) or an 8 which is the code for the 5.7 TPI (L98).
While your there see if you can get a Y pipe from the same car as it will be your best bet at finding a good one.

Air_Adam

LG4 and LO3 are the engine codes for the lower HP engines.. the base V8s. The LG4 is a 150hp 4bbl 305, and the LO3 is the 170hp TBI 305.

The L69 is the 190hp "HO" 4bbl 305, and the 5.7 TPI is.. well... a 5.7 TPI. Most 5.0 TPI's also have the good exhaust manifolds. If you find any TPI engine, it will probably have the good manifolds.

It doesn't matter if your engine is computer controlled or not. If the manifolds you use have a spot for an oxygen sensor, just buy a plug for it. Just a basic pipe plug should work I think.

84L69TA

Those manifolds have a larger diameter outlet. They will not bolt up to an LG4, LU5 or L03 y-pipe.

kenf729

iTrader: (3)

So what you're saying...if I find a LG6 or 5.7 I would need the Y pipe? otherwise I'd need to get one out or a LG4 or LO3 using my Ypipe? So if I go to the yard and there is no engine and the vin (8th digit) isn't a G or 8. How do I tell if the car was a LG4 or LO3. is there any casting numbers on the manifolds? sorry for all the questions.

JamesC

iTrader: (5)

Yes. The following link shows the difference between the LG4 and L69 Y and demonstrates why you should RUN from the LG4.

https://www.thirdgen.org/forums/atta...tion-ypipe.jpg

I'd pick up the cat and intermediate pipe too if possible. These were larger than the catback that I purchased for my old LG4. If the dual snorkel air box is there grab that too (I have one. Should you be interested, please PM me).

By the way, the L69/5.7 manifolds are a bit different. The emissions hook-ups run in opposite directions, IIRC. The L69 driver's side manifold will have a heat-stove if you're running a carb (the TPI version won't, of course) and on the pass side, there'll be a butterfly valve (can't recall the name at the moment) between the manifold and Y. The TPI version will simply have a spacer.

JamesC

Air_Adam

Actually, the L69 and 5.7 manifolds are the same, its just the equipment that was attached to them after casting is different. The AIR lines are different and the L69 used an EFE valve (the butterfly valve he mentioned), whereas the 5.7 just used a spacer. The manifolds themselves are the same.

84ZMIKE

I have a set of L69 manifolds you can have if you pay shipping.
Good luck,
Mike

kenf729

iTrader: (3)

wanted to thank everyone for the coments, I ended up with the LO3 stock exhaust for now, once I get the car running (almost finished with engine rebuild) I'll start looking at the Hooker hearders with duel exhaust.

CrazyBear

i think you shouldve just gone with headers in the first place but that's just my opinion. Anyways glad to hear you got it working.

kenf729

iTrader: (3)

Unfortantly I still need to get the engine into the car, also I need to get it to pass DEQ, I thought the easy way to do this would be to utilize the current exhaust system, then depending on funds buy headers and new exhaust. but I do agree with you the best way would have been to put headers on and new pipes...