S&S Cycle Camshaft - 640 Series - Evolution Big Twin '84-'99425263858 Product Description For large displacement engines 110" and larger with 10. 5: 1 to 11. 5: 1 compression and smaller engines, 96" 107" with 11. 0: 1 to 12. 0: 1 compression Less overlap and fast ramps build higher cylinder pressure Lower TDC lift makes installation easier Designed for use with hydraulic tappets Made in the USA Notes Installer must check coil bind, valve to valve clearance, valve to piston clearance and cam lobe to case
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