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Is there a way to tell whether my engine is the older 305HP or the newer 317HP version?

I recently had the engine replaced as the cat failed and destroyed the engine. My original engine was the 305HP one since its an '06. I would guess they put in the 305 but don't know how to tell.
 

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The intake manifolds are different between the old motors and the new ones. So maybe that can tell you???
 

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ummmm I dont know. I know a few people have switched intake manifolds though. Maybe someone will chime in. Ask gweasel I think he might know.
 

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He does have an 08 intake manifold, and i know his truck is an 06. So he probably knows.
 
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