Glad you posted this, i beleive we had a thread like this years ago, my 455 in my bird smoked pretty heavy, so when i had the head off on one side, i found the cylinders were slick as glass, so bought bon ami, poured it in my hand and i rubbed it around in those cylinders, what the hell right? well sure enough its not smoking on that side now, hey im not promoting it as can of overhaul powder, and this is a on the trailer off the trailer down the track car, but i did see a noticable improvement.
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