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Message: <blockquote data-quote="frank" data-source="post: 249767" data-attributes="member: 4874">tomi doubt the stock valve springs would bounce with anything but the wildest cams ( the piper cam leaves only about 2.5mm before the stock spring is coilbound, which does,nt leave much room for stronger ones)if the oil pressure is ok, i would be tempted to leave the shells in because they are sized and graded to very tight tollerences, but a glazebusting and new rings is well worth it imo</blockquote>