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    Bad Heads?! Any advice on the Castech head issue?

    I'm a relative newbie to the forum... just joined when we bought our 2004 Tahoe Z71 with the 5.3. I've been snooping around the forum looking for mods, etc. About two months ago we got a low coolant message. It took about one gal. of coolant to fill it back up. Since then it has eaten...

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