The most technologically advanced heads on the market. Mike Roland's designs carefully balance the production of awesome horsepower and torque with the important qualities of a good street motor - starts as easy as a stock bike, runs on pump gas without any detonation, runs cooler than stock, and is as tractable as a stock bike.
Features:
- Efficient bathtub combustion chambers
- Proprietary valves designed on the flow bench to match Wild Things® ports
- Heads come completely assembled with High-strength stainless steel valves and high-performance valve springs with titanium top retainers
- Intake Ports - 3/8" raised high flow and high velocity with 1.980" stainless intake valves
- Exhaust Ports - High velocity constant radius "D" shaped high flow ports with 1.630" stainless exhaust valves
- Fits all '99-'09 Twin CamÑIncluding '08-'09 Touring
- Set up to take up to .640" lift cam
- Utilizes equal length head bolts to minimize cylinder distortion and promote consistent head gasket squish. Requires purchase of four long OEM headbolts, sold separately. (H-D P/N 16478-85A)
- Extra cooling fin area, more than any other heads on the market
- Larger and improved breather passages, requires crankcase breather kit with 1/2"-13 breather bolts
- Larger and relocated oil drains get the oil down out of the heads
- All stock parts will mount to head
- '06-'09 with Wild Things Throttle Body require P/N 457 Flanges (If using stock Throttle Body, must use '05-earlier stock flanges)