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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. Be the first to review this product

    As low as: $2.25

    Available in flat-top for standard compression with factory 1200cc heads, and higher compression 10 degree dome-top for use with Thunderstorm® and factory 1200 XL heads (raises compression in factory 1200 heads to 10.5:1). In compliance with ARB emissions laws, this product is not sold or shipped to California.
  2. Be the first to review this product

    As low as: $2.25

    Lightweight ‘Slipper’ Design! 1/8” oversize pistons feature ArmorGlide™ skirt coating, a high-tech lubricant that reduces friction and allows the piston to be fitted tighter within the bore allowing a better ring seal and reduced noise from piston rock. In compliance with ARB emissions laws, this product is not sold or shipped to California.
  3. Be the first to review this product

    As low as: $2.25

    Available in three different reverse-dome (compression) configurations for 883-1200 conversions using stock 883 heads. In compliance with ARB emissions laws, this product is not sold or shipped to California.
  4. 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.
  5. Be the first to review this product

    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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