This weekend I am putting the rcr stage 1 kit in and I just had the head shaved .020 and a new weisco piston bored .020 over in my 96 trailblazer. I have not insalled an oil block off yet so I am still using the stock injector. First question is should I go to pre mix gas and how do i figure out the ratio of gas to oil to use. Second question how should I go about breaking in the new piston. Thanks for the Help.