I had this same kit installed in my Rincon. After 200 miles the facing of the cam was worn off and bits of metal ground up in the oil and filter. I have since installed the factory 680 kit and used the original cam. The cam was a Web cam unit. I was suprised to find such a sorry job done on facing and regrinding the cam. Everything looked good when we installed it. I'm glad I didn't send in my core. Just for your info I don't recomend this mod. The power was really nice. Also the machinist cut the top of the cylinder liner recess a thousandth or two too deep and the liner broke seal with the head gasket. That's what lead to the discovery of the cam facing. Also the cylinder liner sticks excessively down into the cases which just doesn't look right. I haven't talked to Highlifter, the supplier of the kit. It's took me a while to be able to discuss this with out cussing and swearing. I really want to keep things positive. Let us know how things turn out.