Notes: 4.1" bore; 0.038" compressed; 8.22cc volume;

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

Notes: Non street legal. Stainless steel armor without wire ring combustion seal. Perforated core graphite construction.

Notes: Non street legal. Will also fit Yates cylinder head. MLS bore bead combustion seal. PermaTorque MLS multi layer steel construction. 3 active layers. 2 shim layers.

Notes: Non street legal. Left hand. Pre flattened steel wire combustion seal. Steel core laminate construction. Minimal brinelling of aluminum head.

Notes: Non street legal. For severe duty such as nitrous or turbos. Loc-Wire copper wire combustion seal. Steel core laminate construction. Requires precision machined receiver groove in head.

Notes: Non street legal. 4.150" bore. Left hand. Pre flattened steel wire combustion seal. Steel core laminate construction. Minimal brinelling of aluminum head.

Notes: Non street legal. 4.100" bore. Will also fit Yates cylinder head. MLS bore bead combustion seal. PermaTorque MLS multi layer steel construction. 3 active layers. 1 shim layer.

Notes: Non street legal. 4.100" bore. Pre flattened steel wire combustion seal. Steel core laminate construction. Minimal brinelling of aluminum head.

Notes: For high performance engines only. Steel core laminate. Pre flattened copper wire combustion seal. 4.100" bore. 0.039" thickness. Volume: 8.5cc. No brinelling of aluminum head.