Lonnie taylor
New Member
I'm building 348 with 454 crank. Using new aluminum heads. I want it to run on pump gas so I need compression under 10 to 1. My block has 1 big notch in top of cyl. Icon makes a piston at 10.8. Show cars says they don't figure the notch into the compression ratio advertised. So how many different blocks are there? Need to know how to identify. Any help would be appreciated.