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I don't really have an opinion as to whether or not the umbrella seal is as effective as the "normal" seals -- but I sure have seen a lot of umbrella seals hardened like a rock--or missing altogether (having long since been pounded to dust). A hint might be--Volvo switched. That being said, it would really depend on the price of machining. If this isn't your long term motor I'd skip that part--but shaving the head a fair amount will get you a real seat of the pants increase in performance. -- Dave
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