There are various valves used in different heads - The tabel below tries to make sense of the variations i have found to date.


Head ID


Inlet Valve ID

Exhaust Valve ID


65F Ribbed

Turbo Head with VCT

E72 - Single Cut 6mm

J3 - Single Cut 7mm


65F Smooth 

Non Turbo Head with VCT

53J - Back Cut 6 mm

64Y - Back Cut 6 mm