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Scoring a 4.8 or 5.3 with 243 factory heads tomorrow. It's out of a 2007 Tahoe. I've been told that 4.8s didn't come with 243s only the 5.3s? Can anybody verify? I'm only paying $150 for the whole thing so I'm pretty happy. Also, is there a way without the vehicle vin to identify what it is WITHOUT pulling it apart? I know of the pistons but not casting numbers.
 

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That would be the correct cylinder head for that model year engine. The GEN III (vin code V, LR4) never had 243s so that info is only partially correct. GEN IV 4.8s never had DOD or VVT provisions, and they will all be iron, so those are 2 clues as to what you're looking at.
 
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