Unlock the hidden potential of your engine with powerful Top End upgrades from Zipper’s Performance Products. Zipper’s Performance keeps specially CNC-machined heads in stock for super-quick turnaround (on an exchange basis) for Milwaukee-Eight®, Twin Cam® and Sportster® engines. Big Bore conversion kits for Milwaukee-Eight®, Twin Cam® fitted with forged pistons in many different compression ratios for fast turnaround or exchange. Zipper’s Performance also stocks pistons, valves, guides, valve spring kits, and other critical top end parts from the industry’s most renowned manufacturers.
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.
Flat top pistons increase displacement in ’99-’06 88” Twin Cam® engines to 97”; from 96” to 106” in ’07-up engines. Special head gaskets and cylinder machining required.
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.
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.
*Please select the radio button next to item of your choice from the options below, then click add to cart*
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.
***Please select the radio button next to item of your choice from the options below, then click add to cart*