Zipper’s Stage III CNC Ported Evolution® Heads

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As low as: $799.95

Price as configured: $0.00

Overview

Owners of Evolution® powered Big Twins can increase their engine’s output with a set of our CNC-ported EV heads! The factory casting is CNC-machined to our proven high torque, high power port shapes and the valve sizes are increased to 1.900” intake and 1.630” exhaust. Ductile iron Step-Lock guides are fitted and topped off with high quality Viton® seals and a performance spring kit. The head gasket surface is decked for flatness before final assembly.

In compliance with ARB emissions laws, this product is not sold or shipped to California.

Price as configured: $0.00

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