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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: $739.00

    Want to increase the size of your Milwaukee-Eight® engine? Zipper's offers precisely machined H-D® cylinders fitted with big bore pistons using expert processes we have developed since 1981 that guarantee a perfect seal. Starting with a "seasoned" H-D® cylinder casting, we ensure that the MLS gaskets we supply will adhere and seal by removing the dowels and turning the cylinder tops on a specially tooled lathe for flatness, surface finish and perpendicularity. The bores are machined for larger pistons, then diamond honed on torque plates to a clearance dimension determined by carefully measuring each piston for accuracy. Our final finish process speeds break-in and provides a superior ring seal. These kits are supplied with our proprietary CP forged piston kits that include standard tension 3mm oil rings for excellent oil control and longevity. Cometic head and base gaskets are supplied for assembly. This service is provided to your cylinder cores; in most cases a refundable core deposit can be charged to ship finished parts ahead of your parts arriving. If you're interested in purchasing cylinder cores outright (no exchange), please contact our sales department. 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: $374.95

    California based CP Pistons are produced using the latest computer designed forgings for strength and minimum weight. Their detailed machining processes ensure that these pistons can run tighter clearances with less noise, have better ring seal and make more power while providing the highest durability. Zipper’s stocks a wide variety of CP pistons in different compression ratios to satisfy nearly all performance applications. 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

    Co-designed by Zipper's/Wiseco, these forged pistons have superior design features. See below for more details. 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: $5.35

    Stroker flat-top pistons with wrist pin bore raised .125” (wrist pin centerline to piston deck height of 1.140”). Use with stroker crankshaft and appropriate length 4-1/8” bore cylinders for the stroke you’re using. 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: $5.35

    These 4-1/8” bore forged piston kits come complete with rings, wrist pins and circlips, and require 4-1/8” bore cylinders (case machining required). In compliance with ARB emissions laws, this product is not sold or shipped to California.
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