I am rebuilding a friends P15 218, he wants to keep it stock but I am really tempted to up the compression ratio. Terrill has stock type pistons which are 6.6 :1, But sealed power has #37p 7.8:1
We have to bore it anyway so Drawbacks or advantages?? also the head will probably be surfaced also. max ratio with regular pump gas ??? Also if its already been covered please direct me, I must have missed it. Thanks in advance guys. By the way he engines all standard but 2 of the cylinders have trauma, looks like the cylinders will clean up at .030.probably had rings and gaskets late to mid 60s.