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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

    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.
  2. Be the first to review this product

    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.
  3. Be the first to review this product

    From: $15.00

    To: $433.94

    These spring kits are designed to give proper pressure when used with cams in the .550" - .675” lift range.
  4. Be the first to review this product

    From: $41.95

    To: $451.65

    When it comes to high performance valves, Pro-Street out shines the competition. One-piece stainless impregnated by a special German process (.002 deep and .0002 surface build-up) to improve wear performance in cast iron or nickel-bronze guides.
  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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