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

    From: $63.98

    To: $1,294.98

    These superb valves are one-piece forged from a racing grade stainless steel alloy with a hard black finish and a bearing quality hardened tip at the end of the stem to prevent premature wear with high-lift applications.
  3. Be the first to review this product

    From: $10.49

    To: $63.41

    AV&V’s valve seals are made from a special Viton compound that can resist higher temperatures than standard Viton seals. Manufactured to fit tighter on the guide – stays put! For this reason we recommend AV&V’s Valve Seal Driver tools for installation.
  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: $65.90

    To: $345.34

    These superb valves are one-piece forged from a racing grade stainless steel alloy with a hard black finish and a bearing quality hardened tip at the end of the stem to prevent premature wear with high-lift applications.
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