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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: $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.
  2. As low as: $799.95

    Our Stage III ThunderSport heads are the perfect choice for 3.875 - 3.937” bore Twin Cam® engines with all the highs - high compression, high flow throttle body, high flow exhaust and high output at all RPM’s! Our original design has been fully refined to fulfill the airflow needs of the highly modified Twin Cam® engine with displacement ranging from 95 to 107 cubic inches. 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: $1,265.00

    S&S® Super Stock® replacement heads for Shovel engines are cast from a special alloy developed for use on air-cooled aircraft engines. Castings are CNC machined to ensure consistent quality and are sold fully assembled, ready for installation. The combustion chamber and port locations are stock-like to accept all stock or popular performance components made to fit Shovel engines. 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: $2.25

    Available in stock 8.5:1 flat-top or 10:1 high dome compression. The domes in the high compression models are offset to work in stock EV combustion chambers without modification. Fits all 1984-1999 EV Big Twin engines. In compliance with ARB emissions laws, this product is not sold or shipped to California.
  5. Be the first to review this product

    From: $15.95

    To: $537.65

    Matching the correct valve spring kit to your cam is very important to maintain proper valve train control. Crane’s valve spring kits are an excellent choice for many performance applications.
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