Intermittent crankcase pressure issues

Mystery solved then. Definitely think I grabbed those rings when I looked up Keith Black 3.940 rings because I remember the plasma-moly coating and I definitely used KB167s. That would mean I'm running a 1/16" ring in a 5/64" groove.

I think I'm up to 4-5 dumbass mistakes on this engine build now. At least this one was my own. Might just ditch this block all together and start over with the 360 block I just inherited.