Did GM make a small block manifold (other than the 62) which had a flat surface at the outlet. I'm trying to mate a heat riser from my 62 to a 67 exhaust manifold. Can this be done?
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Re: C1 Correct Heat Riser Installation
Richard------
Unless I'm misunderstanding what you are referring to by a flat surface, I can't think of any small block exhaust manifold that isn't "flat" at the outlet. Heat riser valves for 1957-74 Corvette small blocks are essentially the same and functionally interchangeable.In Appreciation of John Hinckley -
Re: C1 Correct Heat Riser Installation
Thank you for the quick reply, Joe. Really appreciate it. And sorry for the question being so vague.
So, let's try this again.....
The 67 manifold has a machined taper at the outlet for a donut type gasket rendering it not completely flat. The 62, however, has no taper and is completely flat at the outlet making it a perfect mate to the flat side of the heat riser. So how can you mate the flat side of the heat riser to the tapered outlet of the 67 manifold? It seems like this would leak. Should there be a gasket between the heat riser and the manifold outlet? I hope I haven't confused you too much, and appreciate any assistance you can provide me. You are a walking corvette technical manual and we do appreciate your expertise!Comment
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Re: C1 Correct Heat Riser Installation
Richard------
The correct right side manifold for a 1967 small block, except AIR is GM casting #3747042. All that I have seen of this manifold have no bevel on the flange for the "donut" packing.
However, even if you happen to have one that does have the bevel or a non-original casting number with the bevel, it should be no problem. There is always a gasket between the manifold flange and the heat riser valve. It's a "triangular" gasket currently known as GM #12522753. You can also get one under Fel-Pro #60083.In Appreciation of John HinckleyComment
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