Got the motor out of the snowblower. Pulled the head off of it. Yeah, the head gasket was popped. What was amazing is that the inside of the head is clean. Bare metal. No carbon build up. Same for the piston top.
No signs of detonation. Cylinder walls look good too. Very little scoring. This motor is to run on 32:1 gas/oil mix. Between my dad and me. This motor has seen 20:1 to straight gas.