yes. Most OEM bottom end builds dont have enough compression to push a good ported head. THats why a valve job will get you more power.Originally Posted by omar
Power is in the valve job. These theories and advice can be used with the H series as well. The H series are even more simple than B series. you can do stock Bottom ends with Cams, an a header an hit 200-210whp. Hell, Goinfasterthanu has a STOCK H22 with a DC Header that makes 193whp