There are various valves used in different heads - The tabel below tries to make sense of the variations i have found to date.
|
Ref |
Head ID |
Notes |
Inlet Valve ID |
Exhaust Valve ID |
|
A |
65F Ribbed |
Turbo Head with VCT |
E72 - Single Cut 6mm |
J3 - Single Cut 7mm |
|
E |
65F Smooth |
Non Turbo Head with VCT |
53J - Back Cut 6 mm |
64Y - Back Cut 6 mm |