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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: $1.97

    Flat top pistons for S&S® Super Stock® 4” heads. 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

    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.
  4. Be the first to review this product

    As low as: $34.95

    These replacement ring sets by Hastings are the same as supplied in every new Harley-Davidson® motorcycle engine. The top ring is a barrel faced, moly filled design from which long life, proper lubrication & scuff free service can be expected. The 2nd ring is reverse torsion type; oil ring is the famous Hastings ‘Flex-Vent’ 3-piece design, which exerts uniform pressure on the cylinder wall while providing 200% more drainage capacity than conventional one-piece oil rings. Sold in sets for 2 pistons.
  5. Be the first to review this product

    As low as: $51.49

    These replacement ring sets by Hastings are the same as supplied in every new Harley-Davidson® motorcycle engine. The top ring is a barrel faced, moly filled design from which long life, proper lubrication & scuff free service can be expected. The 2nd ring is reverse torsion type; oil ring is the famous Hastings ‘Flex-Vent’ 3-piece design, which exerts uniform pressure on the cylinder wall while providing 200% more drainage capacity than conventional one-piece oil rings. Sold in sets for 2 pistons.
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