Deck height clearance issues?

[akinswonder]

Hey guys, I'm in the middle of rebuilding my m20. So far I've had my eta block bored & honed to 85mm. I recently installed my s52 crank, s52 rods and CP forged m50 pistons 85mm 8.5:1 CR. What I discovered is that the piston sticks out of the block 5mm. Does any body know what the ideal clearance height should be. I'm gonna run a mls gasket but idk how thick I should get it, any help is appreciated, thanx in advance.

[akinswonder]

I did some research and I found that clearance b/w the block and the head should be about .045in or 1.14mm. So I did some math 5mm-1.14mm= 3.86mm or .155in. So I will have to get a mls gasket w/a custom thickness of about .155in. Now how can I calculate CR and figure where my numbers will be. By the way this motor will have a turbo so I want the compression to be as low as is possible with this set up. Thanx