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I agree with mreid. It looks like a lifter check ball and spring if that ball is about 3/16". There should be a clip and and disc that the push rod sets in somewhere still in the engine. I have seen this twice before. One time it was on my truck with a new Sig Erson RV cam and lifter kit. It happend about 200 miles after the install. I lucked out and just had to put in one new lifter. Could be from over reving stock lifters, but who knows. It will be interesting to see where that push rod is setting to not be causing a lot of racket. If you pull the valve covers give us a picture before you take off the rockers.
In the worst case the push rod got push out of the way and the lifter got pushed out of the bore and is laying in the valley. From there it could get ugly with the push rod falling down the lifter hole and hitting the cam. Hope for the best.
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