I have a 351w that I just finshed up recently for my fox and am having some smoking issues. I just had it at the dyno getting tuned and the only time you could see any smoke (which was very faint at that) was when the engine was getting up around 6200-6500 rpm. When I drive it on the street if I get on it I leave a big cloud of white smoke behind. The engine feels like it runs fine (good power and did about 7 runs on the dyno ) just smokes if you lay into it. It has kieth black hypereutectic pistons so I went off there guide calculator for gapping the rings. I did the top ring at .030 because thats what it said to use if you were going to boost it. I dont have boost on it now but plan on it so thats why I gapped them that way. Is that why it smokes? If so is it doing anydamage to the walls not running boost for the rings and when I do boost it will that clear up the smoke and make the rings seal better due to everything getting hotter and expanding?