28861-07A Automatic Compression Release (ACR) valves reduce the strain of starting your high performance motor by reducing cylinder compression - automatically! The engine is easier to turn over resulting in less wear on your starter and battery. After start , the ACR valves close to restore full compression.•ACR can be installed on stock or Screamin' Eagle Performance cylinder heads for all '07-later Twin Cam equipped models • Install requires machining to be performed by a competent machinist using the Screamin' Eagle Automatic Compression Release Fixture Kit P/N 94648-08 (sold separately) • Installation requires separate purchase of model specific ACR Wiring Harness FITMENT INFORMATIONFits '07-'17 Twin Cam-equipped models. Can be used with Original Equipment or Screamin' Eagle Cylinder Heads. Does not fit with Twin-Cooled engines.• Sold In Units: Each • In the Box: Valve onlyThese Screamin' Eagle products are 50-State U.S. EPA compliant for sale and use on all applicable vehicles , including those that are pollution controlled. See Genuine Motor Parts and Accessories or Screamin' Eagle Accessories catalog for fitment information. Screamin' Eagle Performance products are intended for the experienced rider only.
