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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: $5.35

    Stroker flat-top pistons with wrist pin bore raised .125” (wrist pin centerline to piston deck height of 1.140”). Use with stroker crankshaft and appropriate length 4-1/8” bore cylinders for the stroke you’re using. 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: $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.
  3. Be the first to review this product

    From: $49.95

    To: $906.75

    To make big power, you run an aggressive cam profile with high lift.To maintain control of the valve train, the valve spring needs to provide adequate seat and nose pressure, and be able to last a reasonable life cycle in a sometimes brutal environment. In today’s performance engines, this is one of the most highly stressed components; for this reason, you should only consider the highest quality spring you can buy.
  4. Be the first to review this product

    From: $12.25

    To: $1,044.00

    AV&V’s CNC-machined valve guides are made from Manganese bronze alloy which allows tighter clearances for improved heat dissipation, quiet operation and long life.
  5. Be the first to review this product

    As low as: $5.65

    Flat top pistons increase displacement in ’99-’06 88” Twin Cam® engines to 97”; from 96” to 106” in ’07-up engines. Special head gaskets and cylinder machining required. In compliance with ARB emissions laws, this product is not sold or shipped to California.
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