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. Provides best power in low to mid-range 1000 to 4500 rpm. Works well in 80"- 96" motors up to 10:1 compression. Works with hydraulic tappets. Requires high-lift springs. Made in the USA. Installer must check coil bind, valve-to-valve clearance, valve-to-piston clearance and camshaft lobe to case clearance..