273 Commando Slugs

hi, I couldn't let the comment about cast rings versus moly rings slide. a cast ring is all metal it will rust to a bore, moly will not!! plus a moly ring is self lubricated, it will seal under wide open throttle, a cast ring will not!! thats why a moly ring seals better. and race motors with moly rings do not need to be rebuilt every season. I have done a motor that had cast rings in it, the guy raced it, ran at the middle of the pack, , rerung with moly rings, now runs at the front easily, and picked up 400 RPM down the back stretch. way faster. the rings lasted way longer too, without loosing seal and power. just food for thought!!