S&S Cams are tested on the dyno, street and track before being offered to the public, With hundreds of hours of testing on each cam, you know you are getting the best cam S&S can produce, Works well in all size motors up to 10:1 compression, Provides best power in low to mid-range, Bolt in cam, Quiet valve train, Made in the USA, Installer must check coil bind, valve-to-valve clearance, valve-to-piston clearance and cam lobe to case clearance.