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 Intake Camshaft - Stage 1 and the Hot Cams Exhaust Camshaft - Stage 1 (sold separately) are intended to be used as a set. Excellent low-end to mid-range gains. Great top-end gain and over-rev. Note: Intake and exhaust cams sold separately. Detailed Specifications: Intake duration (degrees at 1 mm): 249.00. Intake lift (mm): 8.48. Intake lobe center (degrees): 106.00. Intake valve lash (mm): 0.15. Shim kit: HCSHIM01. Notes: Uses stock valve springs.