Hello,

Im currently building a f22's head, to be swapped into my Datsun 510.

The following parts will be ordered to be put in:
- Crower stage 2 camshafts
- Crower Valvesprings and titanium seats
- Crower polished valves
- GSXR ITB
- Polish the head

Now my question is, BC offers differnt sized valves. Copied off of the site...

36.0mm Intake (standard head diameter)

31.0mm Exhaust (standard head diameter)

37.0mm Intake (+1mm head diameter)

32.0mm Exhaust (+1mm head diameter)

Im not sure what size to get for the valves. Im looking to build an all motor race car.

Thanks.