Check my work-Chime in please

frosty_the_punk said

What numbers are we missing? We have calculated both the above deck volume and the below deck volume at the same time using the .500" method and come up with a final number of positive 2.4cc.

subtract that 2.4cc from the cylinder head chamber volume and you have the total chamber volume. 60.1cc.
factoring in gasket volume and cylinder's swept volume, all the numbers are there. right?

Having the advertised numbers, I also got a IVC at 56 degrees. bringing my calculated DCR to 8.15:1 at sea level.

Click to expand...

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.

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. 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. Focus on the things like piston-to-valve clearance and consistent piston deck heights and piston-to-deck clearances and such.