Skunk2’s professional line of high-lift and duration racing camshafts, dubbed "BMF" produce up to 100 hp gains in the Honda K20A, K20A2, K20Z1, K20Z3, and K24A2 engines or engines using those VTEC cylinder heads. BMF camshafts are designed to optimize top-end horsepower and torque, with peak power moved up the RPM band. No other line of racing camshafts even comes close to Skunk2’s BMF camshafts. The go to camshafts for an all-out racing effort! Pair with Skunk2 Rocker Arms (P/N 348-05-0100) and raise the bar on your engine program!Roller rockers must be used … mainly for race use !!!