What thread is used on series III head studs?

[zeaphod]

Hi all. My 1985 90 has a series III head. I need to know the pitch of the threads on the exhaust manifold/injector studs/pedestal bolts, as I want to make something "special" - not that special, just longer rocker pedestal bolts.

 

[jamesmartin]

unf if not metric 1980 onwards
https://www.google.co.uk/url?sa=t&r...d5xbLVd4i7xj-Blvg&sig2=tnH3i74YD-HVXN4tMt4Guw

 

[zeaphod]

Brilliant James - thanks again!