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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

    Piston kits include rings, wrist pins and circlips. In compliance with ARB emissions laws, this product is not sold or shipped to California.
  2. 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.
  3. Be the first to review this product

    $67.99
    Replace your factory powdered-metal retainers and stamped keys with these highly durable, high quality chrome moly forged spring retainers and steel keys. Don’t risk a catastrophic failure with substandard stock parts in your performance application!
  4. Be the first to review this product

    As low as: $5.23

    These 4-1/8” bore forged piston kits come complete with rings, wrist pins and circlips, and require 4-1/8” bore cylinders (case machining required). 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: $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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