Originally Posted by Magus2727
Not sure on that calculation. C-F-M has a calculator to use when you are looking at their Cometic's head gasket. not sure what all the numbers should be for a stock block and or head. Stock compression is 10.2:1. 0.50 is a large (think most are 20-30 thousandths) but not sure if you would get a full extra number on the left side.
I think at 0.050 you also are making the Zetec an interference type motor. I have asked before but dont recall ever getting an actual hard number of if you remove X material.
I think you will want a tune with that large of a change of compression also.
10.2:1 is the SVT's Compression ratio. The normal zetec's is 9.5:1 wish I could remember the how much to shave but I can't