Hi,

I did some research on Grant and they are of course still in business as the OP is buying some from his parts house.
I never heard of them either!
I made a post To place questions about the condition of the cylinder bores of which brought up the question of rings to run in those slightly oversized bores. I was concerned that the rings and oil film support the pistons.
Ring tension is important, of course, but its the type of material and thoughtfulness of design that gets more of my consideration.

His response was that .... he left it up to his parts man.
In his case he is not going to have the material to get normal tension to hold the rings against a cross hatch pattern.
To help wear in his rings to seating status he might want to consider not using a chrome alloy.
There are coated piston rings they are made to scuff in differently.
I don’t claim a great knowledge in that area.
Like him I leave it up to the ring manufacturers.
The link below and others are correct is stressing the use of ring expanders on the upper compression rings and which side goes up!

https://www.youtube.com/user/HastingsPistonRings

Like a Volvo you got to let it Roll.
You may want to get a tall mug of drinking fluid if you go out TOO far on the YouTube!
There is somewhat of an education out there ... if you can wait OR wade through some long winded presentations.
Mostly its those that read or fake what they don’t know that bothers me! (:)

https://www.waynet.org/waynet/spotlight/2003/030521-perfectcircle.htm

When I was growing up “Perfect Circle” had training films in our vocational machine shop classes.
They are now out of business and Dana now owns their brand name! It’s popularity now, is unknown to me?

Hastings is another piston ring company, along with Cooper Tires. When I taught Machine Shop for about three years I used video to make my students realize the processes and their economic impacts of mass production.
https://www.youtube.com/user/HastingsPistonRings

Like a Volvo you got to let it Roll a Ways to learn about the details of good stuff or whatever is lame!
The truth be told I haven’t ever purchased any of these products but it has affected my thinking about them over the years with other products. I appreciate training materials!
So consequently, I might be prejudiced towards some brands, but I have learned better to use loyalties in decisions all the time!

In the machining world “perfect” doesn’t exist as It comes down to how close you want to look!

Phil