66 350 Exhaust manifold

[William L.]

I located what is supposed to be a pair of 66 exhaust manifolds however the number for the left is 3848668 and the right is 3747042 which I believe is correct. Doe's anyone know what the 3848668 fits or was it possibly used on a 66 as well as a 3846559???

Thanks,

Bill Lutter

[Joe L.]

Re: 66 350 Exhaust manifold

I located what is supposed to be a pair of 66 exhaust manifolds however the number for the left is 3848668 and the right is 3747042 which I believe is correct. Doe's anyone know what the 3848668 fits or was it possibly used on a 66 as well as a 3846559???

Thanks,

Bill Lutter

Bill------


I am not aware of and can find no record of any exhaust manifold of casting number 3848668. I think this is likely a case of casting number digits being difficult to discern and what it really is is a GM #3846559. If the manifold has a 2" straight outlet and has a forward-facing alternator mount when installed on the left side, then I feel pretty confident that it's a 3846559.

[Mike M.]

Re: 66 350 Exhaust manifold

Nope, only the 559 without AIR.
I cannot find any Straight Axle or M-Y appication for the 668.
HaND