Originally posted by nicelysedated
I just bought a set of heads for $150. The casting numbers are 3917291 and 3890462. Does anyone know all the details on these heads. They were in great shape and are ready to bolt on.
You have 2 different kind of heads there.
3917291 came on 67-69 302s with 2.02/1.60 valves.
67-69 327 '' '' '' "
They also came on 68-69 350 with 1.94/1.50 valves.


3890462 came on 67 302-327 with 2.02/1.60 valves.

I feel sure the heads are vere simular, Hopefully you have same size valves in both heads.