Posted By: Cape
Hemi piston ID - 10/02/22 12:58 AM
Hey every! I’m trying to figure out what pistons I have in my Hemi. Sounds stupid as you’d think I would know after having the engine built. So they were suppose to be CP 12.5:1 pistons but I think the builder put the wrong ones in. I pulled the oil pan off to see if I could see a part number and all I found was the CP logo and 426H-C, I can’t find any info on these pistons. The motors a 4.28 bore and 4.15 stroke with a 6.86 rod. The motor made 827@8000 and didn’t really perform like it should have that’s why I pulled the pan, and I have a buddy with the same short block but with Ross 13.5:1 piston which is completely different. Any help would be appreciated