thanks tech!

i looked at those pistons. ran the KB calculator. ended up with numbers a little different than yours. if i add .005 to deck/gasket height i come down .1 in DCR and SCR. see below. the KB calc 7.6 DCR makes me feel alot better. How did you arrive at 8.1 ? piston face design doesn't seem to affect SCR or DCR, they are all about volumes, but i bet it effects spark and flame propagation. Am i getting too wrapped up in this? is a few tenths SCR or DCR really going to matter in my app? my main concern is detonation and the impact DCR and SCR have on it as well as trying to get a good quench. these three things aren't playing nice with each other. LOL.

ENTER YOUR DATA CALCULATED DATA
Cylinder Head Volume (cc) Cylinder Head Vol
(cubic in.) 03.904
Piston Head Volume (cc) Piston Head Vol
(cubic in.) 00.732
Gasket Thickness (in.) Swept Volume
(cubic in.) 44.389
Gasket Bore (in.) T.D.C. Volume
(cubic in.) 05.226
Cylinder Bore Diameter (in.) Gasket Volume
(cubic in.) 00.462
Deck Clearance (in.)
Note: Neg. nubmer above deck, Pos. number below deck Deck Volume
(cubic in.) 00.128
Stroke (in.) STATIC COMPRESSION RATIO 09.494

OPTIONAL DATA
Rod Length (in.) Adjusted Stroke (in.) 02.674
Intake Closing Point (degrees)
ABDC @ 0.050 lift plus 15 degrees DYNAMIC EFFECTIVE COMPRESSION RATIO 07.527