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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

    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.
  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: $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: $141.49

    To: $569.96

    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. Development testing has shown AV&V’s retaining components to be over 50% stronger in destructive tests than stock.
  5. 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.
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