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Be careful if pushrods are to short the rocker arm could be hitting retainer and crack it thus drop a value.if to long they could cause the bottom of spring retainer to hit the vale guide boss where the value seals sit.was something changed? like head gaskets,heads shaued etc etc because these could change rocker geometry alse the guide boss has to be milled down with some of the aftermarket retainers or when adding lift.i am sure i missed something but you should get the point be careful. post us up some pics
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