S&S Cycle - 106-4381
Type: 570C; Timing Open: Intake 20º/Exhaust 55º; Timing Closed: Intake 40º/Exhaust 20º; Duration at 0.053: Intake 240º/Exhaust 255º; Valve Lift : Intake 0.570"/Exhaust 0.570"; Lift at TDC: Intake 0.187"/Exhaust 0.179"
The 570 cam is designed for 88 to 96 inch engines with compression ratios between 9:1 and 10:1. Many riders are leery of the stock chain cam drive in late model big twins. While it is true that the early version introduced in 1999 was not well suited to high performance applications, the later version introduced in the 2006 Harley-Davidson® Dyna® model, and later incorporated in all big twins in the 2007 model year, was vastly improved. The new chain drive with hydraulic chain tensioners works well for all but the most demanding high performance applications. That's why S&S now offers our most popular grinds for 2007-'16 big twins in a chain drive version. The advantage to a chain drive cam set is the expense. When you replace the stock cams with an S&S chain drive cam set, you re-use the stock cam drive components so you save money on parts.