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 have a disease…..
Project mania…lol
Love to build stuff and can’t say no when I see something in my reach. I have some of them done, but most are still works in progress.
1) my daily driver, she is my true love. 15 years of daily driver flawless service! 2004 4Runner.
2) My first car from 1986 that I still have. Building it for my now 17 years old daughter. It’s a 74 Sun Super Bettle. Has 2110 turbo, 220 hp on water dyno
3) 1979 911sc Max Moritz German born import. Finished painting about a year ago, but this is how she still sits.
4) 1969 beetle with 2.5L turbo STI forged stuffed into it. Crazy amount of fab work. Done with everything but body and paint.
5) 1998 C5 naturally aspirated 470rwhp on the dyno….so much fun!
6) 1972 CJ5 lifted on 39.5’s with hydraulic assisted steering and 4 wheel disk brakes. First V8 that Jeep made AMC 304.
7) My daughters go kart
8) Dads go kart with forged internals of course..lol
9) 2006 Buell 1250 scg
10) 2006 Screamin’ Eagle V-rod
11-12) YSR 50 and the yellow one is a YSR with a IT 175 2 stroke 6 speed with custom frame and reinforced swing arm. Clocked at 87 mph in a 25 speed limit by local policemen in my neighborhood. He let me go (IMG:style_emoticons/default/first.gif)
13) 1991 FZR 400 with 632 big bore Wiseco motor stuffed into it. Also very fun little corner ripper that I take to the Dragon in Tennessee every couple of years.
I do all my own work on everything and nothing has stickers on them…all paint.
Oh yeah…and last but not least the 74 2.0 Olympic blue 914 that I’m currently building a 2056 for.

Actually, just the math was bad. The rest of the posts were fine.

I do not like to make simple mistakes. "In front of me" I'd have been fine.

Sometimes "over the keyboard" can create confusion.

In the "show us what you've got thread" Chad911sc posted this tidbit

"2) My first car from 1986 that I still have. Building it for my now 17 years old daughter. It’s a 74 Sun Super Bettle. Has 2110 turbo, 220 hp on water dyno"

He's got a bunch of nice stuff but that caught my eye as it is the most Type4 like.

I'd like to know how that was done, how long it's run, and what problems he's had along the way.

I'd stay Type4 on my 75 if I could make that type of power without spending 20K...