Founded in 2001 as the first manufacturer of aftermarket, performance billet camshafts for the dirt bike and ATV market. Today Hot Cams manufacturers almost 250 unique camshaft profiles in its Urbandale, Iowa facility. Stage 3 exhaust: Dual-cam motor. Hot Cams Stage 3 camshaft is an incredible way to boost your top-end and provide great over-rev. Hot Cams designed the Stage 3 exhaust camshaft to use your motorcycle's stock valve springs and rockers for easy-to-install performance. Note: Intake and exhaust cams sold separately. Detailed Specifications: Exhaust duration (degrees at 1 mm): 253.50. Exhaust lift (mm): 8.74. Exhaust lobe center (degrees): 97.25. Exhaust valve lash (mm): 0.20. Shim kit: HCSHIM02. Notes: Uses stock valve springs. Includes auto-decompression mechanism.