ProComp/Speedmaster aluminum heads

Just my two cents and I'll get my licks in hitting this dead horse. I put on a set of Pro Comp heads on my 340 4 years ago as cast heads. I did have problems with one Helicoil on a manifold bolt. I used 50 thousandths steel shim head gaskets with a KB243 piston I measured 18 thousand out of the hole on the piston . after expansion and Rock I figured my squish to be 30 thousandths my cranking compression ended up being 165 I would have liked it a little higher, but my camshaft comes in at at 241 at fifty on intake and exhaust. Overall I have been very happy with the performance of these heads. I have plans to take them off this winter and open them up