[Billy Nees]

Cast rings are so soft that they don't much care about wall finish. If your combo has a 4" bore, look into "claimer rings".
Understand that there's all sorts of ring packages that will pick your combo up but to get started you can't beat them. And these ain't no "50 runs and done" rings either. If you're just starting on a combo or just building a car that will need a lot of testing laps OR if you're going to (heaven forbid) Bracket Race the car also then check them out.