You are correct, sir,, and thanks for taking the time to lay it all out for everyone. I was trying to separate out the positive above-deck and negative below-deck displacements to enter separately in to a calculation. But, in the end, it does not matter if they are entered separately in 2 places, or combined in 1 place. The net effect is the same.
Good to know, thanks for clarifying. My motor books used the method I used and they are Mopar books.
Doing it both ways (with an estimate of the above deck dome volume at TDC), I ended up with 9.64 SCR and 8.14 DCR. If DR thinks that is a bit too much, a .039" head gasket yields a 9.34 SCR and a 7.89 DCR.
I can be happy with the 8.14 DCR and I already own the .028 head gaskets I want to use.This is using the advertised intake closing angle for the cam, which Lunati measures at .006" valve lift. So the only question is what calculator is better: using advertised closure angles or estimating off of .050" lift angles.
You could deck the block or heads at this point DR, or try to find steel shim head gaskets to get it up, but you're gonna find it to be pretty good at these numbers.
Somebody tell me this little motor is going to run like the 283 chebby I build when I was a kid with the Duntov cam and 10:1 pistons Focus on the things like piston-to-valve clearance and consistent piston deck heights and piston-to-deck clearances and such.