12480009
18° Aluminum Cylinder Head

• Low-port 18° aluminum cylinder head for competition engines
• Identical to P/N 10134359, except that it has a new design intake port for the Daytona Dash Racing Series

10134359
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 2.200" 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