Cylinder needed milled, compression question

[DEADLY FORCE]

Kind of an advanced question, I bought some used Aluminator coyote cylinder heads and were boxed poorly when shipped and had some scratches on the gasket surface so I had a machine shop plane/mill it down -0.1 mm which equals to 0.004 inches. Does anyone roughly know how much of an increase in compression this would be if I used a stock head gasket? Thanks in advance.:rolling:

 

[grnenvy]

Only 4 thousands it's not much. U can buy the multi-layered head gaskets in different thicknesses so your ok.

 

[03Sssnake]

Doubtful that .004 thousands would result in much of a compression bump. The machine shop probably took off the minimum amount of material needed to true the heads.

However I am only getting back into the Ford side of things these days, so I am not sure with these castings. With my 243 GM castings, roughly every .0065 off = -1cc from the combustion chamber. I took .020 off to get to 11:1 up from 10.5:1. That was with GM MLS head gaskets being used.

 

[hopony]

3.14× bore radius in mm squared × .01 = volume of area removed. You can use cr calculator online and change head gasket thinkness by .1 mm it looks to be about .09 increase in compression. If I entered everything correctly.

 

[DEADLY FORCE]

Cool, thanks for the information guys!

 

[DEADLY FORCE]

I'll be at around 10.1 to 1 then with my new build.