I think that look at 50,000 miles for a modest rebuild. A major overhaul would be in keeping with oil being burnt off or excess smoke coming out the pipes. I had the crank and pistons replaced at 22,000 miles and now have 55,000 miles total. This was just for the splines on the crank being twisted. I think it was just easier for S&S to replace the whole assembly rather than piecemeal. No smoke or excessive consumption of oil so far. If this beast was on a bike, I would probably look for a rebuild sooner as the number two cylinder "behind" number one will get hotter and take more of a beating just like a Harley would. Since both cylinders receive equal airflow that is not a problem. Adding an oil cooler would definitely add life to this motor.
