Star Racing M8 Performance Cam Shaft - Full Race Milwaukee M8 Cam .615 Billetron Big Air carbs It can be activated by

It can be activated by a posistive 12v signal or a ground signal

For racers who cannot afford to have cam timing variations

Travel (White Ring): 36 mm

Cometic Big Bore

Star Racing M8 Performance Cam Shaft - Full Race Milwaukee M8 Cam .615 Billetron Big Air carbs It can be activated byFull Race M8 Cam . 615 Most Powerful Designed for Maximum Performance 3000 to 7000 RPM Range . 615 Lift, Intake Closes at 52 ABDC Must Use High Perf Springs use Star #STC 640SK Made for Big Engines 131 150 or High Revving 124 133 Sounds Like a Racing Cam Experienced installer needs to check Spring capabilities, coil bind, installed heights, piston to valve clearances, etc