Zipper’s Stage 4 CNC for 06+ TC w/ACR

The largest port we can machine into these O.E castings is what
you get with Stage 4. O.S. 2.00” Valves, Step Lock Guides, special valve seats,
5/16” valve springs allow up to .750” of cam lift. Max flow design for big
displacement engines with large airflow demand. The larger valves are completely
un-shrouded in the fully machined chambers. Combustion Chambers are 98 cc.

*Not Available for Twin Cooled models.

Not legal for sale or use in California on any pollution controlled motor vehicle.

Not legal for sale or use on any EPA pollution controlled motor vehicle.

Click here for Zipper’s Job Order Sheet

Weight 27 lbs
Dimensions 1 × 1 × 1 in
Engine Type

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