Camshaft - Stage 1 Exhaust. 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. The Hot Cams Exhaust Camshaft - Stage 1 and the Hot Cams Intake Camshaft - Stage 1 (sold separately) are intended to be used as a set. Excellent mid-range to top-end power increase. Great top-end gain and over-rev. Note: Intake and exhaust cams sold separately. Detailed Specifications: Exhaust Cam: Dual cam engine. Exhaust duration (degrees at 1 mm): N/A. Exhaust lift (mm): N/A. Exhaust lobe center (degrees): N/A. Exhaust valve lash (mm): N/A. Shim kit: N/A. Notes: For use with both Stage 1 and Stage 2 intake cams. Uses stock valve springs.