Made a couple more pump gas pulls tonite. The belt was slipping (Gatorback) but it still mustered 550/490 @ only 6000rpms. We will try again in a week or 2 with a gates belt, and a RR Ultra Grip pully. It should make over 600 at 6000-6500rpms on pump gas. The power was still climbing but the load was tapering and the belt started dusting at 6k.