I think it can help
Head milled vs compression
Head milled .025-.030" (43cc) w/stock .060" = 8.55 cr
" " " " " 1000 Fel Pro .0375" = 8.86 cr
" " " " " 2 steel shim .036" = 8.95 cr
" " " " " 1 steel shim .018" = 9.31 cr
Stock (48cc) with stock gasket .060" = 8.122cr
Stock " with P/N 1000 Fel Pro .0375" = 8.40 cr
Stock " with 2 steel shim .036" = 8.48 cr
Stock " with 1 steel shim .018" = 8.79 cr
Claude