I would replace all of them if that many have given you trouble. Unfortunately lifters now are usually not the best quality. I would try to source some Johnson’s or even NOS GM lifters if I could. Rhoads would be good as well, just a bit noisy. Get some big block Chevy rocker studs and nuts when you put it back together. If you haven’t converted the stock studs to these, it would be worth your time and money to do so.
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