Best seller for the D15B VTEC and sohc ZC VTEC engines!! Offers a 15% improvement in power over factory with slightly lopey idle with emphasis on the 1700 to 5900 rpm range. Takes 7-10 business days to manufacture from pure billet castings. Aftermarket cam gears and our pro valve springs are highly recommended. 0.420 valve lift on the intake and exh; 247 deg duration on intake and 226 deg exhaust at 0.040 with optimized lobe separation angles.