Exhaust manifold needed

[linas9]

Looking for a exhaust manifold LH casting 384895 "S" or 393233 "S" olds.If you have it,let me know.Thanx

[Guest]

How about telling us what they are supposed to fit.

[linas9]

they fit small block olds for dual exhaust and were made 65-70,there supossed to be a big "S" casted on top of the first port.

[Guest]

Sorry, I have no obnoxious comment to offer like Mr. anon, but there is a guy on the 442.com classifieds (look under "cars for sale") who is selling a 1970 Delta88 and says he will throw in this exact manifold...I think he was planning on converting the car to duals, and lost interest before doing so. May be a longshot to ask him, but maybe you could ask him if he would sell just the manifold.

[linas9]

thanx Scott,already send him an email....you never know <img src="/ubbthreads/images/icons/smile.gif" alt="" /> any ideas what it might be worth ?

[Guest]

Well, I have a habit of over-paying when it comes to rare items...its not that I LIKE overpaying, but if I am looking for something that doesn't come down the pike that often, I will pay what it takes to get it. Money is only dirty green paper. I'm thinking as much as $400 for the manifold if you really want/need it.

I am currently looking for another hard to find part for the big cars...a factory rear swaybar, apparently it is made out of unobtainium. I'd pay $400 bucks (must be some kind of magic number) for one if I could find it. Which is crazy, but that's how bad I want it.

[rocketraider]

Nope, nope, nope- this is not a small block manifold. Those are identified with numbers instead of letters. "S" casting is 1965-70 425-455 LH dual exhaust manifold in 88-98 chassis. There are two different versions of this manifold. 65-69 have a heat riser flap, 70 does not. They kick up at the rear and are radiused to clear the steering gear.

$250-300 is high reasonable price for one of these manifolds. Of course if you can get it cheaper...

[Guest]

Rocketraider, there was another thread wherein you said this exhaust manifold would work on a small-block-equipped big car:

http://www.aaca.org/ubbthreads/showflat....amp;amp;fpart=1

So its possible Linas took that to mean the manifold was made for his car/engine setup. I was thinking, though, that if Linas indeed has a big car equipped with a small-block, the manifold might not even be necessary...I'm thinking with the smaller outer dimensions of the small block, the steering box might not be a prob. A friend of mine swears he once saw a dual-exhaust-equipped 1965 Jetstar 88 with a 330...wonder what they would have used?

[linas9]

Ok guys,I do have a 1968 olds 98 with stock 403 in it for now,the exhaust manifold on it looks like from a 403 with crossover pipe to right side.Us I understand that a big block manifold (LH "S") will bolt up to small block and then I can run dual exhaust to the back,since it was designed for a big car like mine anyways,or am I missing something here?

p.s. Scott,that guy from 442.com with delta 88 is willing to part with that manifold for only 800.00 usd <img src="/ubbthreads/images/icons/smile.gif" alt="" />

[rocketraider]

And he's out of his mind. Of course, there's a cat on e-bay right now who was trying to open bidding on a NOS 68-70 big car chrome remote mirror at $499.95 too. He's dropped it to $250, but that's a $100 part tops anywhere. For $800 he'll probably sit on that manifold till it rusts to his arse.

Anyhoo- back to what manifolds fit what- yes, you can use a big block manifold on a small block engine though the BB ports are larger. Using a SB manifold on a BB will choke it down a bit. Bolt pattern is the same on all.

Now- on a dual exhaust Jetstar 88. Parts books show only a single RH system for series 5200 J88, but the shop manual shows a diagram and clearances for dual exhaust series 5200 thru 8600, and shows the crossover block plate installation for the RH smallblock manifold. However- the diagram shows the LH manifold exit at the rear instead of center. So who knows what the factory may have done? All J88 I've ever seen were single exhaust cars, but it is possible for a good exhaust man to make it look like a dual system belongs there.

Linas, with the small block in there you can try using SB manifolds and having pipes bent for them. The 403 may be just narrower enough that everything bolts up neat and no mickey-mouse bends.

[twjoyce]

Hey guys, it is my experience that although the big block exhaust manifolds have the same bolt pattern as the small block heads, they hit the motor mounts on a small block engine and can't be tightened down. Better try it before spending the kinds of megabucks you are talking about spending here.

[rocketraider]

Good point, Tom- I know that will happen in an A or X body car, but there may be enough room in a big car that it won't. Linas- maybe your best bet is to sacrifice a little power and use small block manifolds.