Milwaukee-Eight® Center-Cooled Models

The Zipper’s Gen2 Stage 3 cylinder head package features +1mm valves on both intake and exhaust, and a full CNC port job for optimum flow. The unique intake port shape of the Gen2 cylinder head is port-matched to the new S.E. 68mm throttle body and manifold system. Zipper’s Gen2 Stage 3 head upgrade begins with an inspection of the cylinder head as received; seats, guides and valves are all inspected for unusual wear or issues. After the inspection is completed, new intake seats are installed, and the cylinder head is CNC ported. The valves and seats are then professionally machined and blended to provide maximum flow in an un-ported head to achieve power and concentricity without the cost of ported heads. This process offers superior flow and sealing over the OE or a SE head. Heads are decked and fully assembled, ready for installation. Before decking approximate cc volume is 93-94 cc, which can be decked & paired with multiple different compression pistons for various outputs.

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.

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