Hi, I have a 8hp motor that I just rebuilt. Well I have the short block finished. Before I started I did some investigating and come across a little section in a briggs and stratton repair manual, and in this section it stated that a gas flat head with a few madifications can be started and warmed with gasoline and then be switch to run on Koresene. It also said that I would only lose 10% hp and saze about 15% fuel. I want to do this. What Sould I do to break this engine in? What oil should I use to break this engine in? How often should I change the oil? And what good oil should I use after break-in? Thanks for the replies and help.