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

[Chad911sc]

Trust me! That was my first thought when purchasing a 914. Stick a turbo Subi engine into it, but when I seen this Olympic blue 914 on Craigslist, I loved it just as it was. I figured I would leave it original and possibly let my daughter, who just turned 17, have it as her second fun car to sport around on the weekends. I haven’t finished the bug yet, have all the fabrication work done but still have to finish the body work and paint. I can’t wait to drive it! The engine purrs like a kitten. I used the Cobb system to tune it and have it close, but I will go to the local Subaru dyno shop to get the perfect set up once it’s finished.
The 911sc engine is exactly like it came from Max Moritz, I had the local Porsche guru fit the new tensioners and Mahle pistons and cylinders when I purchased it over 20 years ago. I don’t think it had a bunch of extra hp, but when Sid Collins tore it apart to rebuild it, the case halves were polished internally and it’s fuel injectors were longer and different shape than the factory ones. Sid said it was done for better distribution of the fuel for efficiency in the burn. Never had it on the dyno, but it definitely scoots. I have only put about 10k miles on it in the past 23 years.
I bought the Corvette from a man down in Miami who had it stolen from his driveway and purchased a new one with the insurance money. They found it 3 months later in a shipping container bound for overseas. I picked it up for 7k and dropped 7k in the engine and suspension. It’s a Super fun car to drive….endless burnouts for days and Sooo much fun to power slide through long corners…lol.