John, In my other car I have a 440 block that I put in sixpack pistons and sixpack rods. I'm using 452 heads on this motor and I do have pinging at higher rpms. More noticable when I get on it. Would a different set of heads do better on this motor?Like 915s? I always hated hearing the pinging!!!

Going back to the 426, can you tell me what specs I would need to order custom pistons for this engine to make it right? Thanks, Alex