the problem with the 1.8 cvh is that its very low comp when used with a 1.6 head, so you need to fit 1.8 pistons to raise it back up.

you'd think that low comp would be good for turboing, but the pistons are shit and have very thin crowns, so anything over .5bar and the slightest hint of det will melt the fookers.

if you wanna go bigger capacity then a 1.8 zetec lump will drop straight in, if you use the 130 spec lump, or upgrade to 130 spec, itll go pretty well for not alot of dosh/hassle!