harley-davidson twin cam cnc ported heads

The intake seats will allow 2.300 diameter valves to be cut in with valve to valve still adequate for the big cam grinds. The valve size is 2.200 on the intake and 1.800 on the exhaust. During a recent visit with Reggie, this writer witnessed this demonstrated with several R&R equipped bikes. The B2 comes CNC ported with plenty of room to enlarge for big cubes. One small but amazing benefit is that your bike with R&R heads and reasonably close jetting and timing, will require absolutely NO choke to start and idle smoothly when stone cold.

The result is unparalleled volumetric efficiency (MAJOR torque AND throttle response)-an engine that pulls hard and loves to rev! R&R heads are simply the best! Math told me that the exhaust port and valve on the Evolution heads were enough for 80'-96' engines used on the street and years of porting Evos have proven it. So every R&R head has the PERFECT match of port volume and shape to meet the SPECIFIC appetite of the engine it will feed. We offer three levels of CNC porting service for Twin Cam Heads: The Impact service treats your heads to our exclusive and proven 4-Axis CNC port treatment, followed by hand finishing, bronze manganese valve guides, a custom radius valve job, sizing of the chambers to achieve your desired compression ratio, and decking your heads to get a perfectly flat gasket surface. Twin Cam engines have the same intake valve as an Evolution engine, yet the exhaust valve on the Twin Cam is smaller than the Evos, and the Twin Cam is 88 cubic inch.

With 100 s of hours studying (and re-writing computer programs and code), 100s of hours flowbench testing, over 3,000 dyno runs, Reggie knows his stuff! Period! Every R&R head he produces is CNC ported to meet the specific requirements for a particular application utilizing Reggie’s proprietary Cross Sectional Flow Analysis. 99-05 models require separate purchase of (2) Intake Flanges P/N 26993-06.

is recognized by performance industry leaders as a top expert in engine performance theory specializing in port flow. Heads are assembled with high performance valve springs that support cams with lift up to 585' Note Fits Harley-Davidson 99-later Twin Cam-equipped models (except Twin- Cooled models). Keeping up with the Ronzellos is not for sissies! This family is nuclear powered! In a mere 5 years what began as a father-son hobby of souping up Jr.s’ Sporty, has evolved from Dynos in the garage and a machine shop in the basement, into a large, bustling business (R&R Cycle) with CNC milling stations cranking out 300+ cylinder heads a month! Reggie Sr.

Harley-davidson twin cam cnc ported heads