[Fot] 6 Cylinder Heads

[Larry Young]

I'm still working on the specs for my warmed up TR250. I have received 
conflicting opinions as to which head is better. The early US spec heads 
had smaller ports than the PI heads and the later carb heads.  Does 
anyone have any firm data, e.g. flow data or dyno data, to support the 
superiority of one head over the other?  Kas did the 128 mph 
demonstration using a mildly modified TR250 with small port head.
Larry Young