C5 cast iron headers
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Teching In
Joined: Aug 2008
Posts: 5
Likes: 0
From: Oakland, MI
C5 cast iron headers Can anyone help me find the mating flanges for the Corvette 12561255/12561256 exhaust maifolds (with one offset hole @ 3.75" on each)?
I am building a 1937 Chevy and I may have to make them, does any one have the correct hole dimensions?
I am building a 1937 Chevy and I may have to make them, does any one have the correct hole dimensions?
Bill,
Try Stainless Works, they are a sponsor. I know they make exhaust systems for the C5 Corvettes, so they might have something that bolts to the factory manifold.
If you don't have any luck, consider buying a set of the early C5 Corvette manifolds. I think they were '97-'98 only. They were a 2-ply steel design, created to insulate the engine compartment from heat. The manifolds didn't even come with heat shield. If you get a set of those, you can easily cut the flange off and weld on whatever you want because they are steel and not cast iron. I am pretty sure the v-8 Fiero guys do this and it works for them.
PM if you are looking for a set... I think I have some nice clean ones in storage.
-Dave
Try Stainless Works, they are a sponsor. I know they make exhaust systems for the C5 Corvettes, so they might have something that bolts to the factory manifold.
If you don't have any luck, consider buying a set of the early C5 Corvette manifolds. I think they were '97-'98 only. They were a 2-ply steel design, created to insulate the engine compartment from heat. The manifolds didn't even come with heat shield. If you get a set of those, you can easily cut the flange off and weld on whatever you want because they are steel and not cast iron. I am pretty sure the v-8 Fiero guys do this and it works for them.
PM if you are looking for a set... I think I have some nice clean ones in storage.
-Dave
Joined: Sep 2004
Posts: 3,148
Likes: 12
From: Downers Grove, IL
How about making flanges out of some 1/2" steel plate? Thats what I`m going to do for my brothers f-body manifolds. You don`t really need a lot of tools to do it, if your really on the thin side you could do it with a drill, hacksaw and a file. Would be a lot easier with a bandsaw, a angle grinder and a die grinder but not essential.
Not sure if this will work:
http://www.stainlessworks.net/cart/p...4b5a1c54ddb73b
I've got the same manifolds and I might try to make a couple out of steel plate.
Oh yeah, dont forget the donut inserts to seal them. Ecklers has them.
http://www.ecklers.com/product.asp?p...5&dept_id=1332
http://www.stainlessworks.net/cart/p...4b5a1c54ddb73b
I've got the same manifolds and I might try to make a couple out of steel plate.
Oh yeah, dont forget the donut inserts to seal them. Ecklers has them.
http://www.ecklers.com/product.asp?p...5&dept_id=1332
I'm doing the same thing. The original C3 exhaust was set up similarly, so I'm modeling my flanges after those.
I got sone 1/8" steel and I'll bend the outside edge around it for support. I figured that would be easier than making them out of 3/8" steel.
I got sone 1/8" steel and I'll bend the outside edge around it for support. I figured that would be easier than making them out of 3/8" steel.
