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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. As low as: $695.00

    KITS FOR 1999-2006 TWIN CAM® ENGINES Factory 1999-2006 Twin Cam® engines are equipped with 4” stroke crankshafts. The factory cylinder bore size of 3-3/4” yields the 88” displacement. We can turn your 88” engine into either a 95 or a 98”, simply by resizing the factory cylinders. In compliance with ARB emissions laws, this product is not sold or shipped to California.
  2. Be the first to review this product

    From: $140.95

    To: $1,199.75

    From our northern friends in Canada come these excellent quality valve spring kits, utilizing ultra clean Kobe high silicon spring wire and precision-machined collars and steel keepers for improved valve control and long term durability.
  3. Be the first to review this product

    As low as: $1,367.00

    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 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.
  5. 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.
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