Is it possible on start stand 1st fire up at 10 to 1 compression on a 312 mild cam stock valve springs, that the starter is to weak? New battery, New cables, good ground. Will only crank very weakly for a second then moan to a stop like dead battery. With plugs out of hole you can turn crank with about 20-30 lbs of torque pressure. I pulled starter and spun very fast on bench. Any ideas welcome thank you.

Gary