Hey stock49,
my pistons were not rated for 12:1,they were approx 10:1 flat tops,but I see what your saying.;-)
That explains why my combo made so--------much torque !15:1!!!! LOL
HMMMMMMMMMMMMMMMM torque!

Twisted6 has used the 12:1 pop-up pistons,but,,do not know what his cranking compression was.

MBHD


12 port SDS EFI