Difference in Heads
After endless searches, I still find myself confused about some of the key difference.
What I'm fairly sure of:
1st gens are pretty much the same for 70mm long stroke.
2nd gen 88-89 DOT, 73mm bore, Larger valves yet smaller combustion chamber? What I am unsure of is if the DOT was used on other bikes such as Katanas. IF so, How do I distinguish the origin of a head and or Cams?
90-92 is where I am not so clear other than it is again for a long stroke. Apparently the 90 does not use Shims which some claim is an advantage. Are there other differences in the 90, 91, 92 heads and how do I distinguish those?
Some claim (including Kelly Roberts) the 92 best suited for builds? What is different on the 92 from the 91?
Some claim the DOT is Head of choice while others say 90?
I understand some of this is subjective and it has ALL likely been hashed and re-hashed over the years. But as I mentioned, searched till I'm blue. Perhaps there is a definitive "Head Guide" I haven't found?