[TatII]

hmmm pushrods might be lighter and cheaper, but i wouldn't never go on saying its better for performance engines. you guys need displacement to make up the lack of flow from your 2 valve heads. one of teh best flowing push rod heads is the hemispherical heads, but its still a 2 valve design with one large intake valve and one small exhuast valve compare the surface area of the two valves combined and put it up agaisnt any average 4 valve per cylinder head of a similar size bore diameter and the 4 valve will always out flow the push rod's 2 valve heads. why do you think formula one doesn't use push rods in their 3-4 liter 800hp n/a engines? why do you think your 3.8 liter blown push rod v6 can't even make as much power as a n/a 3.5 liter dohc v6? or why do you think its so harsh to rev it to nears its redline compared to a silky smooth dohc v6?