a built h22a1 sleeved with rods/pistons and stock head with cut-down duration psi for psi will make more power than an equally modified h23a1.

i am a firm supporter of the h22a1
probably because i have seen 3 blown h23a1's in the last 12 months (spun #2 CR bearing on all 3 motors)

and i believe its the crank not the bearings themselves

while the h22a1 crank is good to nearly 1000 HP and revs much much higher with no mods, on the order of 8500 no problem, at that rpm the head is the weaklink anyway

~boomer