i have a 427 bored 60 with speed pro L2308AF pistons. heads are merlin 119 cc alm. cam specs are 255/260 @ 50 688 lift lobe sep 107 degreed at 103. compression is susposed to be 11.53 to 1 but checking it with the gauge it only has 140-148 psi on all cyl. whats the problem?