Is it possible to drop a 2008 Duramax engine into a 2003 to replace an existing Duramax? Will it drop right in or does it take major modification? Thank you!

I'm not positive but I think there is going to be some modification involved. What do you have a line on a Duramax LMM?
2008 GMC Sierra 2500HD Ex. Cab, Fire Red, 6.6L Duramax LMM Equipped with UTG Rocker Pods
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