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Re: L59 fuel question
Pretty sure that 4.8's and 5.3's use the same head gasket, so the tag doesn't always match. The easiest way to find out if it's a 4.8 or 5.3 is to pull the heads, but you can pull a spark plug and shine a flashlight in the hole to see if the top of the piston is flat or dished. Flat is 5.3, dished is 4.8.
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