Can You Identify Two Exhaust Manifolds?

[Norm B.]

These are "As found" at the back of a shed. The one with the partial pipe still attached is a 2" but I cannot find anything that even resembles a discernible number on it. The other one is 2 1/2" and there is a stamped 3797901 on it, what appears to be an 801 cast at one end, and an 801 with a 942 under it cast at the other end. Sorry for the picture quality, I did not have a great camera to take the pictures with at the time.

[Gene M.]

Re: Can You Identify Two Exhaust Manifolds?

The 2 1/2" manifold is a good piece used on vette. The other 2" one is junk.

[Bob J.]

Re: Can You Identify Two Exhaust Manifolds?

Looks like the 2 1/2 inch manifold has the front ear hacked off.

[Joe L.]

Re: Can You Identify Two Exhaust Manifolds?

These are "As found" at the back of a shed. The one with the partial pipe still attached is a 2" but I cannot find anything that even resembles a discernible number on it. The other one is 2 1/2" and there is a stamped 3797901 on it, what appears to be an 801 cast at one end, and an 801 with a 942 under it cast at the other end. Sorry for the picture quality, I did not have a great camera to take the pictures with at the time.

Norm------


The 2" curved outlet manifold is likely a GM #3855163. This was used on most 1965-68 full size passenger cars with small blocks. No curved outlet exhaust manifold was ever used on any Corvette.

The other manifold looks like a GM #3797942. This manifold was a variation of the 3797901 except with the alternator boss deleted. It was used for many 62-65 Corvettes with HP and SHP engines for the non-alternator side. If the manifold is not drilled for a heat tube, it was intended for L-84 applications. I don't know why this manifold is crudely stamped 3797901. I've not seen that before.