How much horsepower does a stock 45 produce, year is 1947? How much can I get out of it with modifications such as head work, valve work, porting and polishing, performance cams and pop-up pistons? I don't wind it out much nor do I want to. I want to produce the most torque between 2500 and 3000 RPM. I am not really interested in lightning up the flywheels, my experience in doing this results in being harder to kick start and doesn't idle very well. What does polishing the rods do? Is it worth the work required to do it? I ordered Panic's book on "45 Performance", but it has gotten here yet, so I thought I would get some opinions first, I am sure it will help me digest the material when it gets here.