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HE451VE Questions

So I was looking at a parts warehouse looking for a HE451VE. I found lots of 15.0L ISX motors but none had the 451 most had 551's and HX60's.

Was there a particular set-up that the 451 was utilized for? Also, is the 451 only electronically controlled or are some air actuated. I noticed all of the 551's were air actuated.

Thanks, Jason
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