The gasket failed between cylinders 3&4. I have a 7lb spring in there because I thought that would be a safe place to start then turn the controller up when I get a handle on the tune. My timing is 38 degrees, all in by 2000. My afr was close to 10.5 when she went. By the way turbo 6 thanks for the advice on the 4500 converter. That woke it right up.