Eldyn

I have a 455 rebuilt about 15 yrs ago with flat top Pistons now with gas available I have to much compression. Could I replace head gaskets with thicker gaskets to eliminate this problem thanks Eldyn

Gary M

Can't see gaskets making or braking compression numbers enough. You may need more changes.

Tedd Thompson

Do you mean NOT AVAILABLE? Did it run well when you had the old type gas and what is your compression ratio ? What are your symptoms now... Maybe ping problems?... We need a little more info to be able to help much.... Tedd

Eldyn

Fun71

I agree. Need more info in order to give any meaningful advice.

Eldyn

I don't know the exact compression ratio but i would say 11:1. It pings bad. I was thinking the thing the thing to do would be a set of smog Pistons. Also has a small cam headers rpm intake hei ignition. I will find out the exact heads. Thanks Eldyn

Fun71

11:1 compression ratio and a small cam = ping like crazy.

Perhaps you could install a cam with later intake closing to bleed off some cylinder pressure?

Tedd Thompson

11-1 with iron heads is going to be a problem,As mentioned above different cam and have you done anything with the timing?..... Tedd