Maybe. I never heard of that, but then again this is my first roller cam for my car too. Done 7 other flattappet cams and never any trouble.
I always run a 1/2" HD drill to get the oil thru the motor pressureized, and this seems to work nice before even turning th motor over.
Maybe the lifters do have an air bubble, and need to get pumped/bled, pumped/bled, with several restarts of longer running time like you suggest.
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