Asking for Advice Fix 273 or Replace

If I remember right you do a standard compression check. Then to check the rings shoot a couple pumps of motor oil in the cylinder and do the test again if the readings improve much that would indicate the rings are bad. If they don't improve after doing the oil trick probably the valves. Think thats how we did it in high school shop class. I think!

No smoke and blowby sounds like rings to me.