how much to mill

[falconjack]

I have a 66" 200 head that I have cut off the log intake and build a my own intake. I am putting the head on a 250 and wouild like to know how much to mill the head to have 9.5 compression. I have cc'd the head and know it is 51cc's. I know to consider the thickness of new head gasket.

 

[bubba22349]

Allowing for the head gasket thickness you plan to use, also need to measure the piston top to block deck height and dish depth of piston.

 

[falconjack]

deck height is .100". and it has 7cc dish pistons.
What is the stock compression of a 1969 250? I know the 250 head had a 62 cc combustion chamber. So if my 200 head that has a 51 cc chamber and I put it on the 250 what would the compression ratio be? If I mill the head .030" to compensate for the new head gasket.

 

[JackFish]

Maybe this will help:
http://www.falcon6handbook.com/compcalculator.asp

 

[bubba22349]

The 1969 250 had a 9.1 c.r. They also used the steel shim head gasket that were about .025 thick.

 

[falconjack]

thanks, just what I needed. looks like .030"