Head gasket bore size VS compressor ratio

[Fordman]

How much difference to the compression ratio would there be between a steel.shim head gasket that has a 4.400 bore size and .024 compressed thickness  versus a cometic. 027 compressed thickness but 4.0975 bore size have on a .030 over 390 (4.08). Thanks

[blykins]

If the head gasket bores are perfectly round on both, then it will only change about .01 of a point. 

[Fordman]

Thank you Brent!👍