VTX1800N1

I found the following calculator online:

http://www.csgnetwork.com/compcalc.html

For my son's engine build, I entered the following parameters:

Cylinder bore: 3.572" (his is .020 overbore)
Piston stroke: 3.543" (stock stroke 4.6L)
Head gasket bore diameter: 3.630" (found this as listed for the Fel-Pro MLS gaskets we are using)
Compressed head gasket thickness: .036" (listed for the Fel-Pro MLS)
Combustion chamber volume 38 or 44cc. We haven't decided which TFS head we are going to use yet.
Piston volume: -11cc for the dished Manley pistons
Piston deck clearance: .002". The stock 4.6L Modular deck clearance is .008", and the machine shop said they decked the block .006" to square it up. This is the only measurement I'm not absolutely positive of.

The results are:
38cc chamber: 11.4957:1
44cc chamber: 10.4706:1

I think we will go with the 44cc heads, as this leaves open the possibility of forced induction later on. The high compression with the 38cc heads pretty much makes that impossible.

Hope this calculator helps someone else out there when it comes time to build their motor.