640 Cam

S&S Cams are tested on the dyno, street and track before being offered to the publicWith hundreds of hours of testing on each cam, you know you are getting the best cam S&S can produceFor large displacement engines (110"+) with 10.5 to 11.5:1 compression and smaller engines (96-107") with 11 to 12:1 compressionRequires high-lift springsLess overlap and fast ramps build higher cylinder pressureLower TDC lift makes installation easierDesigned for use with hydraulic tappetsInstaller must check coil bind, valve-to-valve clearance, valve-to-piston clearance and cam lobe to case clearance.Made in the U.S.A.