[flatheadmurre]

I´m not sure that many understand what low tension actually means...the only rings that has a tension spec is the oilrings...
Compression ring (first ring only) is forced against cylinderwall by compression and not by a set tension in it...
So if you go modern low tension you have to adress windage or oilcontrol will be the next issue in your new motor.
And if you go real narrow you need tight piston to ring fit...which means you need gasporting for the rings to work...
If resistance turning the engine over by hand would be reflected in horsepower gain it would be lovely...sadly that isn´t happening.