Setting deck height for 9:1 compression Options

[Chad911sc]

I have my short block built and I’m ready to set my deck height. It’s 96mm bore with stock 71mm factory crank. This is a 2.0 2056 build. I have a Web 86a cam calling for approx 9:1 compression. I have 60cc heads with 3cc valve reliefs on my flat top pistons. If I plug all this into the calculator, I get 8.3:1 for my compression ratio if I set the deck height to .040 inch
After I set up the piston on the rod and bolt down the cylinder to the block, I get .053 inch from the piston to the top of the cylinder.
My question is, what is the best way to proceed to get the 9:1 ratio with at least .040 inch total deck height.
I am thinking that if I take off 6 total cc’s from the head, that will leave me with 54cc heads with the 3cc valve pocket = total 57cc’s. Bringing me now to the correct 9:1 compression ratio with the .040 inch deck height.

If I am in the right ballpark, this means I need to have my heads fly cut….correct??
If this is correct, how do I go about calculating how many thousands of an inch do I need to have removed by the machine shop to remove 6cc from the head?

I obviously will need to remove at least .013 inch total deck height get to my .040 goal, and that’s with no shims or head gaskets being used.

Thanks for your time, Chad

[technicalninja]

I did do a deep dive into turbo T4s after seeing your turbo T1 notes.

There is also another old thread that re-surface showing a baby system on a 1.7 that seems to "work" but at low levels (7-8 psi)

Lenn Hoffman set me straight!

He suggested a single 1.7 head casting (Q?) was the way to go and high boost would make the combustion chamber besides/below the exhaust port "droop", loosen up the valve seat, and "The Reaper" would arrive shortly thereafter...

There was also a long discussion on using some very special T4 heads that had side exit exhaust (like a T1!). Looks like these critters were 4-5K for a pair a decade ago.
These REQUIRED the DTM cooling system (like a T1 as well).

I saw enough to answer my "Hey, maybe boost is The Way" thoughts.

Nope.
No "blowing" a T4 in my future!
Water boxer Porsche 6 or GM LGX will be my path...
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