I am curious how many cc reduction on a typical "G" head per cut of say .008?

That's what mine took to clean up(thanks to a previous shop cleaning them too agressively).

I think Ted said for each .0055 of milled head, 1cc off in Comb. chamber.  It is basically irrelevant, depending upon how far down the valve seats are.  Best to CC them to know for sure.

Mike, located in the Siskiyou mountains, Southern, OR 292 powered 1946 Ford 1/2 ton, '62 Mercury Meteor, '55 Country Squire (parting out), '64 Falcon, '54 Ford 600 tractor.

46,

True about the valves...

Out of curiosity, where did your's cc in @?

Did you end up having to cut the pistons?

The number I use for cutting ‘G’ heads is 0.0064” for each cc of combustion chamber reduction.  A 0.008” cut on the heads should be about 1¼ cc reduction.

Lorena, Texas (South of Waco)

The 113's ended up 66-67 cc.  With flat tops and stock rods the pistons were far down, so deck was milled .028.

If you dont have a setup to perform cc'ing, a very close approx. can be had with $5 worth of equipment.  A square piece of 1/4 in. plate glass, 1 60 cc syringe, and 1 30 cc syringe (both available at a farm supply).  You position the plate over the chamber, leaving the smallest possible reveal at one edge, just enough to be able to get the fluid in with syringe.  Another option short of buying a kit is to search on the net and find the 100 cc burette and stand at a surplus lab supply.  I priced one last year and think it was under $10.  Then only the chamber cover would be lacking. 

Mike, located in the Siskiyou mountains, Southern, OR 292 powered 1946 Ford 1/2 ton, '62 Mercury Meteor, '55 Country Squire (parting out), '64 Falcon, '54 Ford 600 tractor.