Ok, I just got an eagle stroker crank to bring the disp to 1.8L 3.335" stroke and I will be doing the darton solid deck pro kit sleeves with 85mm JE 9:1 pistons. I have a t3/t04 setup with the new crower race core turbo cams and will be running nos this summer, for 20+psi boost what size stainless valves would be best? Std, .5mm or 1mm over?

 

A lot of people running high boost will tell you to keep the valves OEM size. I would suggest the same, unless an expierienced head builder can convince you otherwise.