18° Aluminum Cylinder Head

• Low-port 18° aluminum cylinder head for maximum-effort competition engines

• Offers significant improvements over conventional head designs with 18° valve angles (vs. older 23° angles) and 43cc combustion chambers

• Spark plug holes are centrally located and valve centerlines are relocated

• Exhaust ports are high-flow

• Head face has an extra 0.080" of material for 9.1:1 compression, and up to 2.20" intake valves can be used

• Shallow wedge-shaped combustion chambers allow builders to achieve high compression ratios with small piston domes

• Heads do not include valve seats or guides

• Aftermarket shaft-mounted rocker arm assemblies and pushrods are required

• Piston domes and valve pockets must be matched to the revised combustion chamber design