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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 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.
  2. Be the first to review this product

    As low as: $695.00

    KITS FOR 2007-UP TWIN CAM® ENGINES Factory 2007-up Twin Cam® engines are equipped with 4-3/8” stroke crankshafts. The factory cylinder bore size of 3-3/4” yields the 96” displacement, which was gradually increased to 3-7/8” starting in 2010 for 103” displacement. We can turn your 96” engine into either a 103 or a 107”, and your 103 into a 107” simply by resizing the factory cylinders. 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: $894.95

    The original big bore kit from Zipper’s! This kit increases Twin Cam® 88" displacement to 107” with the stock 1999-2006 4” stroke crankshaft. Re-balancing is not required as these special forged pistons weigh the same as stock. Engine height unchanged. Piston dome shape works with the factory head casting (best results with our 2” high output CNC ported head). Includes cylinders fitted with forged pistons, rings, wrist pins, circlips, head and base gaskets. Case boring instructions included. In compliance with ARB emissions laws, this product is not sold or shipped to California.
  4. Be the first to review this product

    As low as: $57.50

    These cylinders are designed to be used with a stock 96” (4-3/8” stroke) crankshaft to increase displacement from 96” to 117”. Can also be used in 1999-2006 engines as long as the crankshaft is changed to 4-3/8” stroke. Complete kits include cylinders, forged flat top piston kit, head and base gaskets. Requires case boring (instructions included) and stroker piston cooling jet kit. These cylinders are .045” longer than stock and require a slightly longer intake manifold or throttle body. 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: $57.50

    These cylinders, when used with our 4-1/2” stroker crankshaft, increase displacement to 120”. Complete kits include cylinders, forged flat top piston kit, head and base gaskets. Requires case boring (instructions included) and stroker piston cooling jet kit. These cylinders are .120” longer than stock and require a slightly longer intake manifold or throttle body. Modest height increase easily fits in all frames. In compliance with ARB emissions laws, this product is not sold or shipped to California.
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