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I have a single pair of 340 heads, they are the same in every way however their casting is different, one is a "b" and the other is a "g", the B appears a little nicer but should perform no different. They have been hot tanked at one point but that may have been a while ago as their is some...

I have a pair of 308 heads, both intake, exhaust, and some of the chamber has been ported. The heads include a pair of 273 adjustable rocker arms off of a 1967 formula S cuda. I do not know the specifics of the port job or the CFM it flows, the head was my grandfathers and I wound up with it...