Thread: compression issues

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hey guys I have 2 sets of castiron heads with the same casting number 14102193.
My book lists them as for 350 1987-up. There is no more info.

One set of heads has GM17 cast into it under the valve cover and the chamber is 76cc's.

The second set has GM23 cast in the same place and is 64cc. Can anyone fill in the gaps here?
I used one to mock up while the other was at the shop and now I have 11:1 using the fresh heads and .125 dome pistons.
I really wasn't looking for that much in my truck and the 76cc's are in questionable condition following a recent implosion. HELP? I was shooting for 10:1 but I don't think a thicker head gasket is going to fix this one.........
I have retarded the cam to bleed off cylinder pressure but that is really a bandaid fix.....unless I can better understand why it will work for sure.

I am running a 4.030" bore on speed pro pistons 0.125 dome (3.5cc) with hastings moly rings .020" gap. piston to deck is 0.020". cast steel crank 3.48". Cam is 214/224 @ 0.050 installed at 105 centerline. Intake closes 34*ABDC

Time and money are both issues. The pistons have been installed but not run, maybe the shop will exchange? I really wasn't planning on building at this time and funds are nonexistent due to the kids just going back to school and the holidays coming. ANY USEFUL IDEAS TO PUT ME BACK INTO THE PUMP GAS ARENA?