Piston Failure

I'm running 32 because I was having problems with detonation under load and that was the most I felt safe with running. I think it was a combination of the cam, compression, and iron heads. The plugs are autolite 5224. The Fast ignition is a CD box, same as the msd stuff but made by comp/Fast. I work at comp cams so I got a pretty decent discount. I was still working on mixture tune, a wideband was gonna be the next purchase so I could dial it in. I'll try to pull all of the plugs tomorrow and take a better look and rerun the compression test and possibly a leak down. Definitely a lot of blow-by though.View attachment 1715359563


Ok, Fast. You said F3 or something and I didn't connect the dots.

What cam are you running? The plugs you posted don't show signs of detonation. But, it can be hard to see in pictures.