[zimmy]

Thanks for the info, Clois. I added a Weber manifold and system to my 427 FE and at the same time changed the cam for a more "Weber Friendly" cam. Ever since then, I have been plagued with severe backfiring on decelleration. Originally, I was told about it being from exhaust leaks. I have fixed all of those to the best of any detection. I spoke to my cam guy yesterday and he suggested that it could be that the exhaust valves may be sticking a bit and closing slowly. To fix that I would have to take the heads off anyway. Since I am running the original 1964/1965 cast heads, I thought this might be a good time to improve on them. Did you buy the complete heads?

Thanks.

Corey