Notes: 4.1" bore; 0.041" compressed; 9.2cc volume;

Notes: 4.5" bore; 0.038" compressed; 12.5cc volume;

Notes: 4.520" bore; 0.038" compressed; 10.05cc volume;

Notes: 4.500" bore; .048" compressed; 13.0cc volume;

Notes: 4.45" bore; 0.038" compressed; 9.69cc volume;

Notes: 4.100" bore; .052" compressed; 11.50cc volume;

Notes: For high performance engines only. Steel core laminate. Pre flattened steel wire combustion seal. 4.180" bore. 0.039" thickness. Volume: 8.9cc. Minimal brinelling of aluminum head.

Notes: For high performance engines only. Steel core laminate. Pre flattened copper wire combustion seal. 4.166" bore. 0.039" thickness. Volume: 8.9cc. Can be used on 400 race engines. Up to 4.155" maximum bore with minimal chamfer. Can be used on aluminum blocks with liners. No brinelling of aluminum head.

Notes: Non street legal. Cast iron or aluminum head. Pre flattened steel wire combustion seal. Steel core laminate construction. Extra large bore. Extra thick to reduce compression and correct piston valve clearance problems. Can be used on aluminum blocks with liners. Minimal brinelling of aluminum head.

Notes: Non street legal. Cast iron or aluminum head. MLS bore bead combustion seal. PermaTorque MLS multi layer steel construction. Can be used on aluminum blocks with liners. Minimal brinelling of aluminum head.