Originally Posted by JCLawn and more
One. Penisular marine makes them 300 hp stock and has made a 600hp 6.5 boat motor. If do everything heath has you should would be at 450hp-500hp without water / meth injection. Water meth is 100hp-250hp increase depending on the system and lowers your egts drastically.
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If you're starting with a completely different motor and lotsa $$ I suppose it's possible. I figured you were starting with a factory GM 6.5 motor that would have came in either of the trucks you have.