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Olds valve train is not ajustable like Chevy. If you are just replacing one set, you should be OK. But if you had a valve job done and new cam, you need to check the lifter pre load. You make the addjustments buy shimming the pivots, or getting the correct push rods. It is not that hard, just not as easy as a Chevy. You can buy a adjustable rocker system, aftermarket for Olds
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