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  • 2 weeks later...
Do you mean from the factory or just jacking out the rack?

Glen I was sent this by mackcl96 Don't no how true it is cause I never seen one.

Hello,

Mack did a E6-400 in 89

Mack also had E7-400 90

Mack always said 350 tops on E6 but they wanted to see what would happen at 400HP before they stop using the E6 altogether. It was a probably a inside bet with the tech guys at Mack.

I don't know how they made out but if it was not going to work they would have a E7 to save the customer.

If your like me you never seen one but dosent make it so.

They were few and far between if it did happen.

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https://www.bigmacktrucks.com/topic/7842-hybrid-engines/#findComment-29148
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