I got a call to come over to my friend's house tonight because he couldn't get his new motor to run right. The motor in question is a 1972 351W that was rebuilt by an "engine builder". After doing the basic messing around with carb and timing, I knew something was up. It was back firing through the pipes with any initial timing under 20 degrees, and when it idled for prolong periods the headers started glowing. I had him pull the covers and found this; Every single rocker was cranked down all the way, and smashing into the valves. He had regular 3/8'' washes stacked on top of the pivot nuts because he ran out of threads and the rockers were STILL loose. It scuffed up the top of the retainers a bit. What is wrong here? I know a part is miss-matched, but I'm not a ford expert. The pushrods measure out at about 8 3/16, which appears to be the stock size for that year motor. I'm assuming the valve springs have a higher installed height than stock, and will require longer pushrods. Just checking before we got that route. Here are the rocker arms that were on the car.