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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
Note
Fits Harley-Davidson Twin Cam '07-'17. Can be used with Original Equipment or Screamin' Eagle Cylinder Heads. Installation requires machining to be performed by a competent machinist using the Screamin' Eagle Automatic Compression Release Fixture Kit P/N 94648-08.
