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Those are the lifter retainer parts. They prevent the roller lifters from spinning in their bores. If they broke, you'll need to replace the lifters, remove any metal from the head (or oil pan), and replace the cam ( I can promise that it's equally as mangled and useless now). People have broken them before for a few unexplained reasons. You should be able to find new retainers relatively easily since they were used on the CVH powered Escorts after the 1st gen.
 

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You are correct in your assumption...it's very likely the shop that did your head work didn't install the valves correctly, and the valve train geometry was off...and the lifters had to over compensate.

Be sure the donor is a roller cam, and you'll be fine. Grab the lifters, too..they'll be matched to the cam. They don't really wear much, but there is a little something, so just keep the stuff numbered properly and you'll be fine (lifter to lobe). If you can find a GT cam go for it and enjoy the extra little boost it gives. And be sure you get any geometry problems resolved before this happens again.
 
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