Ah, yeah, see where I posted, pretty much the same comments as I did on this thread. Guess my mind isn't as bad as I though it is! Heheh!
I say if you go to the 1st step or more above standard, you don't need to make the 2nd bigger, just make it the same. It's enough of a gap to prevent butting if it does see more heat.
So the block is .030 over? Since the rings are .020 over, that leaves an extra .010 for filing. And that explains why the oil rings are tight.
I thought they would box the file fit rings with the oil rings for the correct bore, and not leave additional for requiring to file them. Maybe that fact isn't correct, and my mem IS as bad I as thought! Heheh!
I have a small screw driver with a V cut into the tip, that I use to install spiral locks. I do the same with my thumb, open up the lock kind of in a spring fashion like you, then use the screw driver on the inside edge and follow it around to seat it. But really, whatever works for you is fine, as long as you don't stretch the lock out in a spring direction.
Technically, many don't do a 'true' zero deck, and shoot for .005-.007 (or more) in the hole. The tolerance allows for additional clearance in the even a rod bearing goes, expansion, or if the bore has a slight chamfer.
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