at the min i have a 2.l black top head but have read
sum were that the st170 head will fit on and
has bigger vales as std

im asking this because i wonna build a 500bhp zetec turbo lump
so any one with any info on this will help me thanks

 

The ST170 head should fit as they are built around the same block. However the st170 head is actually quite different. You will need the ST170 ECU to run the variable intake cam. I dont know if the exhaust cams are interchangable either, but you may be as cheap to get bigger valves put into your standard head