i am building a built for boost block. ls block, darton sleeves, cp (8.5-1) compression pistons, crower pro-billet rods. i am going to be running 15 pounds daily and about 25 to 30 on the track. with the 8.5-1 pistons is this gonna be safe to run daily w/91 octain without losing a lot of power? thanks

 

i used to run 17psi daily on 8.5:1 compression on 93, never had a problem. 91 octane is a little on the low side i but it should not be a problem for 15psi but for 25-30 i would find it a problem... i personally wouldn't do it but that's just me...