Thanks Guys.
D15beater, I tore it down last night and it (b20b) had two burnt ex valves in 1-2. But I did notice that the B20b head looked to have bigger intake ports..? And I read through another link that the 20b needs to "breath well"
From experience, The older Hondas like to have HIGH VELOCITY to the intake valve so I'm kinda stuck thinking that I should use a 20b intake welded to the last portion of the B18 or just cut apart, hog out, port match,and weld back together the b18 intake. (I sure wish that Extrude honing wasn't that expensive!)
The exhaust ports look to be the same.. HHhhmmm, Maybe a good porting of the exhaust would help. It looked that one could use bigger Ex valves too. But that would add up $$.
About the pistons, I think I remember reading that even the B20Z pistons were .030 in the hole.. ( wonder if it would be worth it to mill the block down .02+ or Zero even and take it up with adjustable gears..?)
Boy, one could really make the engine think its got lots more compression by milling to zero, advancing the intake by 8+ or so, retarding the ex by 6 or so, and claying the vlaves.
I wonder how much movement the gears will let you get away with.
It could be a pain to dial in the dizzy though.
Thanks again E