302 heads

The heart shape chamber has a point that should be smoothed to prevent detonation. I have some pics but are probably to large for here.

You will find them in 318 powered New Yorkers, Diplomats etc. They are a dime a dozen around here. I heard they are crack prone. The set I own have a raised "J" on the outside near the spark plug holes. Mag them before investing any work in them!

Another alternative head is a 273 head that I just bought. I think it was only made for 1 or 2 years. They are closed chamber. Maybe 68-69?