Hello. I just pulled the heads off the truck. The pistons are marked with 0.30 and the bore for the truck is standard.

any thoughts.

 

Well folks. If you have to EVER sleeve these motors. Trash it and get a new. I pulled my motor apart and found that the motor was sleeved and who eve did it was drunk as a mother. One side was sleeved for 30 over and the other side was sleeved for 40 over and had 30 over pistons. NEVER NEVER NEVER.