CXtypeR

is it possible to have high compression with flat pistons (no dome)???

92TypeR

Yes, but not on a Honda.

The domes are present more or less to accomodate the valves. It could be possible to weld up a head and use dish style turbo pistons (no dome) and cut deep valve reliefs, but that would be a lot of work for improving combustion efficiency a couple %.

WHITFIELD-TUNED

or you could have a huge stroke with flat pistons good burn