JV

I know this is a repost, but i figured i'd bring some tech back to this forum.

I was just browsing over the D series compression calculator. I noticed that it has no info regarding the combustion chamber volume + piston dome displacement of the D16Y7.

http://www.knology.net/~jediklc/D.htm

After doing a couple of calculations. I came up with a PDD of -10.42 for the P2E piston of the Y7. Am i even remotely close on this?

Also, what is the exact CCV of the Y7 head?
I have heard that the combustion chambers are similar in design to the D16Z6 head. Would that mean that they both share a CCV of 34.6?

If take the variables of a Y8 block, Z6 head, Z6/Y8 head gasket, Y8 piston to deck height, and add in the PPV of -10.42 for the P2E which i'm only assuming to be close since it has a dish of 3.32, as compared to the P28's 3.00 dish (-10.10 PPV) .

The compression only ends up being 8.6:1!?

What am i missing here?

Everybody loves pics so here you go: