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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.
  1. Be the first to review this product

    From: $4.95

    To: $982.75

    Manley valve spring kits contain proven parts made from the finest materials to ensure reliable, durable performance in a demanding environment.
  2. Be the first to review this product

    From: $72.70

    To: $741.56

    The standard of the industry for years, Manley stainless steel valves are manufactured from high temperature materials and feature swirl polished, performance oriented shapes and durable chrome plated stems. Up to 30% weight reduction over stock insures a stable valve train, even at high rpm’s. Sold each.
  3. Be the first to review this product

    From: $30.79

    To: $184.74

    The standard of the industry for years, Manley stainless steel valves are manufactured from high temperature materials and feature swirl polished, performance oriented shapes and durable chrome plated stems. Up to 30% weight reduction over stock insures a stable valve train, even at high rpm’s. Sold each.
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