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Good question. Im not sure, I'll ask them next time I'm out there. They may not tell me alot about the motors, that's one thing they keep kinda secret about.
Who knows with those guys. I do know that they said the motors in those 2 trucks a marine diesels. I guess you can pump a ton more HP out of them. I'm posting a pic of the green trucks old motor after it was pulled for the new cat. It's being rebuilt right now to go into my other friends truck I mentioned earlier.