Mikel Becks Heads

Rumble,
I left the guide boss alone as it really only makes the hi lift flows better and from previously ported heads it showed a flow loss below .400 lift as the port would be too large, and with a cam that only has .500 lift it was very important to keep the port as small as possiable so velocity would stay as high as it could. With cams in the .550 lift and less range port velocity is king, a port really doesn't come into effect until after .550 lift. The bowl and the valve job is most important under .500 lift, and you want to have peak flow at least .050 before max lift and realisticly .075-.100 as you have to pass this point twice in the valve motion and your only at peak for a short time. This is where small cams with lots of duration work best, because your holding the valve in the peak flow for along time.