Originally Posted by Pupsvette76
cylinder head casting numbers are 462624 turns out its a 1.94 int valve with 1.5 exhaust valve....small valves!
No surprise to me. Just by your discripion and complaint of lame power
I know those are the heads you had.
They are the worst of the worst crap GM ever stuck on a SBC.
No amount of boost and good wishes will fix these dogs.
A 64cc head will require a piston change. A thich gasket will not work.
There are plenty good 72+++ cc chamber aftermarket high perf heads to choose from.
Not that hard to take any of these heads and open op the chamber larger to 78-80cc to get a low compression ratio.
Low cr is your friend if you want to run big boost on pump gas.