Are you planning on keeping the St head ? The St head will offer no advantage with a budget turbo but there are disadvantages. Sure it has bigger valves and flows more but a Zetec head will flow more than the pistons and rods can take so it’s not the limiting factor.

With the St head The inlet ports are higher so most manifolds need work.


If your going the thicker head gasket route then you want the thickest you can lay your hands on.