Anything's possible...last 69 F250 with V8 that I bought, restored and drove for awhile had seven regulation Autolites torqued properly and one up front on the driver's side of the 360 motor jammed in tight...I PB Blastered it for a couple of days. Just before I pulled the engine I had the hood off, so I made a T-handle on the end of an ancient spark plug wrench in my old man's toolbox, leaned on both ends and it broke loose...turned out to be some bastard Champion, longer than stock with the gap almost closed from piston slap...black as coal, too. After that the 360 ran much better, hitting on 8 instead of 7...too bad the rings were toast.