all your problems might not be the fuel,about 20 years ago i replaced a 250 6 cyl in a company van ran like a sewing machine until it made the first 60 mile trip the next day,came back had 2 pistons chattering,i caught the heat over that one even though i just swapped the covers and pan, engine was already built,next week i finished installing the head and remaining parts on a rd 403 ih truck engine put it in the truck started it up and watched the oil pressure fall,the racket started again two engine that i had installed both with problems, i told them that i didn't do the machine work nor the short block assy on either engine,when i pulled one of the rod and main bearings there were no under size marking on the shells but the boxes were stamped .020 on the rods and mains,there again i didn't know what i was talking about, so i took the shell halves back to the machinist along with the pistons,upon measuring the bearing they were standard no wander it had no oil pressure .020 oil clearance,as for the pistons when i questioned him on them binding on the wrist pins he told me he fitted them himself and they were correct at the time he installed them on the rods,he walked to a shelf and picked up a trw piston and showed it to me then turned an opened a box that had a trw complete rebuild kit in it,then ask if i could see any difference in the pistons , my reply was a blind man could see the difference, then he pointed to the made in mexico on the box,only thing he could suggest was the cheap grade piston were an inferior grade of aluminum and shrunk after getting hot
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