should be machined off the top of a 1.8 zetec pistion when doing a ze-vh conversion ???

me and a couple of the lads have been talking about this and cant seem to find a definative answer ?

motor in question is a rs1800 bottom end if theres any difference

not asking u to post on wether i should do this and the relaibility
issues , cos in a perfect world we would all have new coswrth pistons to drop in


so just looking for how much to machine off ???

thanks peeps

rant over lol