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Top End Components

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 Twin Cam® and Sportster® engines. Twin Cam® big bore cylinder conversions for 88 to 95” and 98" plus 96 to 103” and 107" 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.
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  1. As low as: $695.00

    KITS FOR 1999-2006 TWIN CAM® ENGINES Factory 1999-2006 Twin Cam® engines are equipped with 4” stroke crankshafts. The factory cylinder bore size of 3-3/4” yields the 88” displacement. We can turn your 88” engine into either a 95 or a 98”, simply by resizing the factory cylinders. In compliance with ARB emissions laws, this product is not sold or shipped to California.
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    As low as: $2.25

    Forged pistons specifically designed for use with XL & Buell 883/1200 engines converting to 3-13/16” bore. In compliance with ARB emissions laws, this product is not sold or shipped to California.
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    As low as: $2.25

    Piston kits include rings, wrist pins and circlips. In compliance with ARB emissions laws, this product is not sold or shipped to California.
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    As low as: $1.97

    Flat top pistons for use with stock style heads. In compliance with ARB emissions laws, this product is not sold or shipped to California.
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    As low as: $5.65

    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. In compliance with ARB emissions laws, this product is not sold or shipped to California.
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    As low as: $1.97

    Flat top pistons for S&S® Super Stock® 4” heads. In compliance with ARB emissions laws, this product is not sold or shipped to California.
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    As low as: $5.65

    Flat top pistons for S&S® 124” SSW+ engines. In compliance with ARB emissions laws, this product is not sold or shipped to California.
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    As low as: $0.85

    Wrist pins from tool steel are lighter and stronger than the stock wrist pins used by Harley®. We recommend using these in any performance application. Pin diameter recommendations for .791/.792” pins - use .085” wall pins in street engines with 3-1/2” to 3-5/8” bore; heavy-duty .140” wall in engines with 3-13/16”+ bore or smaller bore engines that see severe use. Teflon® buttons can be used instead of wrist pin spiral lock clips to eliminate any chance of the clips coming loose and causing damage. Buttons lengths are designed for use in Axtell pistons. Wrist pin diameters have varied on H-D® engines over the years. .791” for Shovels & earlier EV XL’s, .792” for Ev Big Twins & late XL’s. Measure your stock ones if you’re unsure.
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