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

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

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

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

Notes: For high performance engines only. Cast iron or aluminum head. Steel core laminate. Pre flattened steel wire combustion seal. 4.166" bore. 0.041" thickness. Volume: 9.1cc. Can be used on 400 race engines. Up to 4.155" maximum bore with minimal chamfer. Can be used on aluminum blocks with liners. Minimal brinelling of aluminum head.

Notes: For high performance engines only. Left hand. PermaTorque MLS® multi layer steel. MLS bore bead combustion seal. 3.630" bore. 0.036" thickness. Volume: 6.1cc.

Notes: Non street legal. Cast iron or aluminum head. Pre flattened steel wire combustion seal. Steel core laminate construction. 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. 4.210" bore. 0.041" thickness. Will also fit Yates cylinder head. MLS bore bead combustion seal. PermaTorque MLS multi layer steel construction. 3 active layers. 1 shim layer.