Kb399 questions

The compression height places the nominally flat part of the piston at the specified height relative to the specified deck. So the nominal compression height with a standard 3.31" stroke and 6.123" rod will be .010" above 9.578" from the crank center line, or at 9.588". If you deck is at 9.600", then the compression height will be .012" below the deck.

The -6.2 cc is the net dome volume above the compression height. KB uses a negative number for a net eyebrow and dome volume that subtracts from the volume above the compression height (raises compression). KB uses a + number for a net eyebrow and dome volume that adds to the volume above the compression height (lowers compression). These numbers, CH and net dome and eyebrow volume, are entered into standard spreadsheets or other computation programs for figuring out static compression ratio.

Hope that is clear! What SCR are you wanting to achieve? I'll be happy to run numbers on this end to see if we agree.