where to measure 273 ring gap in cylinder bore

Professor Fate said
I'm not going to try to do the math to figure the circumferential difference in relation to end gap and taper at a given cylinder length- just measure the bore at top and bottom and see if it falls within spec. The number should be in the FSM. The machine shop should have given you the final dimensions after cylinder prep... Heck, it should have been matched to your pistons.

FSM says anything over .010 taper has to be bored. They did measured my new egge hp piston

Professor Fate said
Make SURE you're measuring your ring gap(s) with the ring square in the bore- generally you use the piston top (upside down piston) to locate the ring in your intended location in the bore- then measure the gap. The more out of square the ring is, the more inaccurate of a gap measurement you will get.

I did use a two barrel piston to locate ring, I will remeasure Monday just to make sure.