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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

    Available in flat-top for standard compression with factory 1200cc heads, and higher compression 10 degree dome-top for use with Thunderstorm® and factory 1200 XL heads (raises compression in factory 1200 heads to 10.5:1). 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: $649.00

    Add Torque and Power to any production Twin Cam® or Evolution® head with our WorkHorse blueprinting service. After cleaning and Step-Lock guide installation and fitment, proprietary seat and valve machining improves flow and ensures a positive seal by truing now heat-seasoned seats and removing typical production chatter that leads to leaks between the seat and valve. This process improves even new, low mileage heads on engines that are being upgraded with cams or big bore kits. Valves are upgraded to Baisley 1.840” intakes and 1.615” exhausts with Viton seals, while new valve springs are set up for cam selection provided. Head gasket surfaces are skimmed to ensure absolute flatness. This Stage I head delivers a true, high quality “budget upgrade” for any engine. In compliance with ARB emissions laws, this product is not sold or shipped to California.
  3. 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.
  4. Be the first to review this product

    As low as: $2.25

    Lightweight ‘Slipper’ Design! 1/8” oversize pistons feature ArmorGlide™ skirt coating, a high-tech lubricant that reduces friction and allows the piston to be fitted tighter within the bore allowing a better ring seal and reduced noise from piston rock. 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: $0.85

    Wrist pins from tool steel are lighter and stronger than the stock wrist pins used by Harley®. We recommend using these in any performance application. Pin diameter recommendations for .791/.792” pins - use .085” wall pins in street engines with 3-1/2” to 3-5/8” bore; heavy-duty .140” wall in engines with 3-13/16”+ bore or smaller bore engines that see severe use. Teflon® buttons can be used instead of wrist pin spiral lock clips to eliminate any chance of the clips coming loose and causing damage. Buttons lengths are designed for use in Axtell pistons. Wrist pin diameters have varied on H-D® engines over the years. .791” for Shovels & earlier EV XL’s, .792” for Ev Big Twins & late XL’s. Measure your stock ones if you’re unsure.
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