Originally Posted by Rick
Originally Posted by JimmyBoy
Why is headwork on a zetec so expensive ?
Because the head is designed for economy & emissions- which is actually why it has 16 valves. The cosworth head is obviously a peformance head as std, and takes a hell of a lot of beating. The cvh hemi head as used on the RST, has HUGE valves as std, and mainly needs work round the valve seats - and shaping of ports. The zetec head has to be totally reworked to convert it from emissions to peformance. It takes twice as long as a cossie head to port - which should give u some idea on price!
Why are there so many disputes on this conversion? I spoke to Ian howell the other day and he said 260-270bhp on stock rods with arp rod bolts will be fine and standard head good for 300bhp.. Standard crank is also fine for well over 300bhp... This guy knows about his engines so why do people say you cant do this or cant do that...
pub know alls