- Speed And Science ® designed “FEROCITY 101” Billet Aluminum (6061-T6) Heads for the Harley-Davidson™ Twin Cam models.
- This is a fully assembled, bolt-on set, suitable for all years of the 96-110CUI models with flat-top pistons.
- Set for up to .650″ valve lift.
- This system achieves very strong torque curve and very respectable HP that peaks exactly where needed. This makes a superb street engine that will keep going strong for a long time, not just a 1/4 Mile!! We went to great lengths to make sure that our product is user-friendly and easy to service down the road also. No special-order pistons, valves, guides, fasteners, etc. to worry about. Nobody offers that – there’s no hidden cost with our product!!!
- Fast, very efficient ports designed to make peak power/torque within the useful RPM range. This is where a lot of people get confused. Please remember, the right balance between flow and velocity makes a good port. 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 85CCM combustion chamber yields 9.25:1 (98CUI), 9.92:1 (103CUI) and 10.6:1 (110CUI) calculated compression ratio with flat-top pistons. Hi-octane (e.g. North American 94) pump gas recommended along with the proper tuning.
- Includes M12x1.25 threaded holes for automatic compression releases.
- ***The difference in surface finish between the Intake (coarser) and Exhaust (smoother) ports is intentional.
- Warranty details and conditions are listed in the Installation Manuals ( Manuals download page )