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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: $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.
  2. Be the first to review this product

    From: $15.00

    To: $433.94

    These spring kits are designed to give proper pressure when used with cams in the .550" - .675” lift range.
  3. Be the first to review this product

    From: $13.50

    To: $67.50

    We’ve never been big fans of the shoulderless valve guides used by the factory in EV & TC heads, so we designed our own. Our ductile cast iron Step-Lock guides have a shoulder that helps set the guide to the correct depth, and, in the event that the engine is severely overheated causing the guide to come loose in the head, allows the lower valve spring collar to capture it, keeping it in place. The top side of the guide is machined to accept larger .531" ID seals while the port side is tapered to enhance flow around the guide. Requires use of stepped lower valve spring collars (our Crane spring kit collars work fine without modification). We offer lower collars to fit the spring kits we sell for use with these guides. Sold each.
  4. Be the first to review this product

    As low as: $2.25

    Co-designed by Zipper's/Wiseco, these forged pistons have superior design features. See below for more details. 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: $23.95

    Zipper’s has developed 3-13/16” bore aluminum alloy cylinders for 883 and 1200 engines to increase the engine size to 88” with the stock stroke crankshaft. In compliance with ARB emissions laws, this product is not sold or shipped to California.
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