harley-davidson twin cam cnc ported heads

Stem protrusion and resultant spring installed height. Next, new bronze manganese guides are carefully pressed-in and sized followedīy an exclusive radius valve job on the seats, paying special attention to the target Process is then applied to the ports and bowls which basically compensates for variances in Open up the seat diameters and rough in the valve job. The ports for maximum torque over a wide rpm range. Through our exclusive 4-Axis CNC porting process which sizes and shapes Them thoroughly, and inspecting them for any defects. We start by stripping down your heads, cleaning Running engine, with the reliability and longevity you demand. Street type exhaust systems, giving a wide powerband and a smooth Impact - $650: Make a Big Impact on your Bike's Performance! Are you converting an 883? Click here to read all about successfully converting your bike to a 1212 or 1250 and what can be accomplished.Unlike Big Twin heads, HD has produced a variety of different heads for XL and Buell models.Ĭlick Here for a brief description of all the different Evo XL heads and their interchangeability.The pictures below show some of the steps that ALL levels of head porting service include. These heads make the best foundation for our porting service. We offer brand new factory high performance Please Contact Us for more information.ĭo you need cylinder head castings as well? Hammer Performance can set you up. XL heads to utilize extra large 1.900' stainless steel intake valves, while keeping costs down.īigger valves (with a seat change if needed), plus a portĬonfiguration custom sized to your specific engine and intended usage,Īs well as any optional special services such as angled squish bands or The Crush service is a special service that takes advantage of the large valve seats in certain Stainless steel valves and a spring/retainer pack that allows more lift The Smash service adds to that our premium quality high flow oversized Heads to get a perfectly flat gasket surface.

Our exclusive and proven 5-Axis CNC port treatment, followed by hand finishing,īronze manganese valve guides, a custom radius valve job, sizing of theĬhambers to achieve your desired compression ratio, and decking your We offer four levels of CNC porting service for Sportster & Buell Heads: Heads through our proprietary process over the years! Click here to read all the details on our advanced CNC process. We have many years of experience preparing XL/Buell heads for both We Specialize in Preparing Sportster and Buell Heads

Harley-davidson twin cam cnc ported heads