Those pistons are not going to sit .005 in the hole unless you get the black decked. The last set I had installed were more like .026 ITH. That's going to bring your compression down to low 8s I would guess. Great for a blower or turbo motor but will most likely not get out of its own way. Plus if by chance it ever does detonate they will probably break into several pieces. I'm not a fan of cast Pistons( can you tell?).