Was driving to town the other day, been on the road maybe 10 miles and a quiet tick started coming from engine compartment. I thought it would work itself out like usual but this time the volume of the noise went up enough to make me pull over and get truck towed back home. It didn't overheat, I run Castrol high mileage cant remember if 10w-30 or 5w-30, pulled valve cover off and turned camshaft manually to check for stuck valve and all good, truck would start right up with ease but noise was there as soon as it fired and very loud. Have since pulled spark plugs and noticed the ends were dinged up/smashed upward a little bit on 1 or 2. Any info on this would be greatly appreciated, seems finding another motor that fits is gonna be harder than I thought.