procomp speedmaster heads revisited

Hi Y'all,

I bought a pair of the procomp speedmaster SBM heads off ebay bare for $380 each. They use std length 11/32" Shivvy valves. The castings look real good. Basic machining is done on these, bronse guides installed, but not sized.

I have messed with mopar 2.2 turbo engines, and to be frankly honest with y'all those stock mopar aluminum castings were really crappy. And they were factory stuff.

These speedmasters look like an LA casting but have heart shaped combustion chambers, magnum style runners, ports, and bowls. These use 2.02 / 1.60 valves.

I am unsure of the CC on the chambers i think procomp stated 65cc. If i use these on my 318 with true KB 167 flattops even with a .050" headgasket i have a bad feeling this things gonna be at or near 11 to 1. Too much for the street. Can anybody verify this?

If i run these with the stock 318 slugs. 74 model 318, about what would i be looking at compression wise?

Eventually i would like to swsp this top end to a 360, but for now i want to run what i got. I know with a 2.02 intake i will have to unshroud and relieve the cylinder bores on the intake side, and run a 360 ,headgasket because of this.

Anybody good at engine math that can tell me? Stock bore x stroke 318, stock 318 slugs, .050" thick 4.00" bore 360 head gasket, 65 cc heads.