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]

That 2110cc type 1 engine was built by Sid Collins of Troysport of Orlando. He is retired now, but he was the MAN in this area for 40 years. He also kicked ass at Sebring in a little red 356 for decades. I had that engine built back in 1997 and it’s still sitting on my shelf in the garage filled to the brim with oil. I built the engine originally in 1989 but could never get the turbo to come on early enough to make it drivable. It would bog down horribly and then come on too hard to control around 2800 rpm’s. It went to a couple local shops in Indiana where it sat for over 2 years with no success. I then moved to Florida in 1992 and brought it with me because it was my first car and love. I was hit by a truck on my GSXR in 95 and it pretty much totaled me. I was bed ridden for over a year and then it took me 5 years to learn how to walk. In that time I used to go to my friend Scott’s cylinder head shop where he did custom porting work for Sid on his 356 race car. Over time Sid and I became friends and he offered to get the big engine sorted out for me. He told me it wouldn’t be done in a hurry but it would be right. 2 years later he called me and told me to come hear it run on the water dyno. It sounded so good and came on smoothly through the power range. He laughed and said, it might run for years, or it might grenade on the first pass down the track…lol. It has never made it back into the car. The superbettle body was perfect when I brought it to Fl but sitting in 100% humidity in a field for 10 years rotted it out badly. I have replace all floors and lower sheet metal in the past few years and it’s coming along slowly because as I said ….project disease!!!
As far as I remember…. Forged internals SCAT ( only thing that existed back then)
Rajay turbo feed by progressive 2 barrel
And then whatever Sid the guru did after he tore it all apart and
did his magic. I know he made custom pushrods because he said
my geometry was off. I didn’t understand any of that back in the
early days. I’ll try to find some picture in the next few days and
post them. I’ll uncover the engine as well and snap a few pics.