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They were suggested by Chrysler fot the 426 race engines , back in the day, "IF" u had a big cam. 5/16 valve stems needed them with a huge cam. We had dick landy re grind the rocker arm pads to go w/ it, just to make sure they were correct. I suspect they were from the factory tho. Hemi`s were "right" , not like chevy stuff !
