Quote: I see alot of people throwing around head and piston combos. With an open chamber head, aren't you suppose to use a stepped or domed piston to get complete combustion whereas a closed chamber head uses a flat top?
I plan on re-using the 906's with minimal headwork, so is a flat top with a zero deck better or a KB 400 with the dome better?
Yes... to get "quench" with open chamber heads a stepped or dome piston is needed. Quench means the piston almost touches the head... .040" clearance is desired. The KB400 piston could probably support this and would need machined to fit the head for each cylinder. Its time consuming but supports higher CR and better combustion on pump fuel. Worth it? you decide. If you want the best running engine with stock displacement and heads yes.
