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Old 01-25-2013, 03:34 PM
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The Buick seals are a positive seal with a retaining ring. Look somewhat like the 87 and later SBC positive seal only for a 3/8 valve stem. The other seal, a black plastic umbrella, is only used on medium/heavy duty SBC powered pickup trucks and medium duty stake, bus, utility trucks. Any auto machine shop should have them in stock.
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