So I built a 500" 400 block based stroker 10 years ago and finally got everything up and running earlier this year. The problem that I am having is the static compression ratio and pinging under heavy throttle. I have flat top pistons and 88cc heads which gives me a compression of 10.8. My engine builder told me that I should be fine with thicker head gaskets but nope. I have mix or use an octane as is. My question is, with very low milage(less than 100) and hours am I able to swap out for some dished pistons and use the same rings to bring the CR down without machining the block?