Ok, finally got a little time to pull out the piston ring and try these measurements. Put the ring at the top, just under the ridge:
[img]https://www.stovebolt.com/ubbthread...umber/22229/filename/20200905_134539.jpg[/img]

Stacking up the gap blades gives me this:
[img]https://www.stovebolt.com/ubbthread...umber/22230/filename/20200905_134919.jpg[/img]

Then rotated piston down to here:
[img]https://www.stovebolt.com/ubbthread...umber/22231/filename/20200905_135046.jpg[/img]

And gap showed:
[img]https://www.stovebolt.com/ubbthread...umber/22232/filename/20200905_135550.jpg[/img]

So the top gap measures out to 0.096" and the bottom to 0.085". which leaves a difference of 0.011"

Divided by PI that gives me 0.00367. From the tech articles, it looks like up to 0.005 is acceptable without reboring and new rings. I was going to try and do this with a caliper as well, but this seems to be pretty accurate in itself.

So now, I'm assuming I need to do this to all cylinders and if they all check out, then perhaps move on to the bottom end?

I also picked up one of these:
[img]https://www.stovebolt.com/ubbthread...umber/22233/filename/20200905_133735.jpg[/img]

Sorry, I ask a lot of questions, when it's something I've never done before. eek

1948 Chevy Thriftmaster 3/4-Ton
Poncho "farming" in Ontario
Starting in the DITY
Continuing in the Project Journals
More images

There are only 10 types of people in this world, those who can read binary and those who can't.