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The Wiseco forged pistons feature larger and deeper valve pockets (16cc dish volume) than normal, a desirable feature for Edelbrock heads, as the valves are moved out slightly. The piston design, combustion chamber volume, and Fel-Pro composite No. 8518 head gasket volume work together to provide a 10.3:1 compression ratio. Piston-to-deck height is zero and piston-to-wall clearance is 0.004 inch.