which I did those measurements. Though I didn't get the parts back between the bore job and the milling of the block face, dry assemble and send back for them to finish. The 30-thou mill on the block deck was a wild guess on my part as to what I was gonna need milled off of the block, to get where I wanted this engine to be, and I tried to compensate once I had the block assembled and measured for piston position/ and then had the machine shop CC the head after the valve job, but before telling them how much I wanted it milled..... then I CCd the head once I had it back in my hands. The machine shop came back with 60cc chambers unmilled, and when they called me I did a quick calc in my head as I was driving when they called and that's how I came up with 70 thou off the head. The chambers came out (1) at 48cc, (1) at 49cc, and the rest at 50cc after that 70 thou "head shave".