RE: Numbers for ST G21/35 DDD head
GAZIMOTO When you get a chance go to the Davis diesel site and check the reviews part, Ridgeway and Pinnock did several., the MVVS 21,40,49, and OS 40LA looks like a power increase to me the real surprise is the OS LA40 which is a little weak on glow but really cranks out the power as a diesel conversion
There may be a few exceptions, the one that comes to mind is the TT07 which was not too swift on as glow and not much better as a conversion , in fact Davis pulled the head from production on this one, he only goes with the winners best regards martin