Improved acceleration, more bottom end horsepower and tourque increase, with NO top end loss. Uses stock valve springs and rockers. Sold individually for single cam engines and in sets, with front and rear cams, for dual cam engines. Note: Image is for display purposes only, actual part may vary based on fitment. Detailed Specifications: Mudbuster: single cam motor. Exhaust duration (degrees at 1 mm): 243.00. Exhaust lift (mm): 8.60. Exhaust lobe center (degrees): 102.00. Exhaust valve lash (mm): 0.18. Intake duration (degrees at 1 mm): 253.50. Intake lift (mm): 9.60. Intake lobe center (degrees): 111.75. Intake valve lash (mm): 0.10. Note: Uses stock valve springs, rockers, and auto decompression mechanism.