NEW!!! EVOLUTION Performance Heads, OEM Bore


EVOLUTION Heads – Billet Aluminum Headset for the Harley-Davidson™  EVOLUTION models (3-1/2″ bore dia).

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*** NEW!!! (Estimated shipping late Summer 2022) ***

  • EVOLUTION Performance Heads – 3-1/2″ Bore Billet Aluminum (6061-T6) Heads/Intake system for the Harley-Davidson™ EVOLUTION models (3-1/2″ bore dia).
  • Top-breathing (OEM venting ports location)
  • Bolt-on installation for all ’85-’99 80CUI models, designed to match OEM flat-top pistons (not supplied) – including all available overbore sizes.
  • This headset achieves very strong torque / power curves (in excess of 90HP, with proper setup/tuning) that peaks exactly where needed, providing you with the fantastic passing power, yet not straining when cruising at your leisure.
  • Our product is user-friendly and easy to service down the road also. No custom pistons, valves, guides, fasteners, etc. to worry about.
  • Fast, very efficient ports designed to make peak power/torque within the useful RPM range. Your bike will pull hard from the get-go all the way up to the redline. The longevity and fuel mileage won’t suffer either.
  • Proprietary, super-fast design of the 75CC combustion chamber yields 9.4:1 calculated compression ratio with flat pistons (@ 80CUI).
  • Valvetrain (AV&V and/or KPMI) components accept up to .635” valve lift, with almost .200” lift before valve-to-valve contact. Using tall camshafts may require an additional machining to provide necessary clearances.
  • Increased cooling area drops the head’s operating temperature up to 35F.
  • ***The Intake and Exhaust ports surface finish is intentional.
  • Warranty details and conditions are listed in the Installation Manuals ( Manuals download page )


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