PISTONS: Flattop or Dish for stoker....

going from say 8:1cr to 10:1cr will prolly get you a 60hp increase. from 10:1cr to 11.5:1 cr mabey 10-12hp.
worth it? mabey in a all out drag car. but for the street IMO not worth it.and yes, generally a 11:1 aluminum head
is equivilent to a 10:1 iron cylinder head engine. duration does not bleed off cylinder pressure, VO (valve overlap)
does, allbeit at lower rpms. upstairs there's not enough time to bleed off. but to answer your question. careful planning
and you can prolly get away with 12.5:1cr on 93 octane. now theres the dilemma of which piston design is better,
FT or dished. IMO, dished pistons make a more stable uniformed flame travel, with way less chance of detonation.
combine that with very good quench (around .040") and you'll get one hellava happy running street engine.
KB sell a "quench" dome dished piston for open/closed chamber heads in case your wondering. one other point,
for anything higher then 10:1 and pump gas.. you should go no further then 33degrees total timing.