Like I told you j an ITR is 270 and you are running higher comp thus you should be above that hell mine is at 190. I told you when the block was bored to MAX spec you get blow-by w/out overbored rings. Your cylinders are probably out of round too. I will bring my crap to your house and check it when you get it apart. Then you can get the block bored over .5 and get oversized rings. No more smoke. End of story.