E7 370 No power

You're gonna have to do a few mods to make it run. That's not a normal E-7 like the old ones. What year is first off? 04-07 by chance? If it's those years it's an AI E-7. It has an extra lobe on the cam for internal EGR. A very restricted exhaust manifold and crappy low end torque.

Give me a bit to find a thread on big Mack trucks that will be very helpful to you. You can essentially convert it back to a regular ETech E-7. The guy gives part numbers and everything. It turned his 370 into a beast

 

The vocational trucks like the granite used internal EGR with an extra lobe on the cam. It was called AI motors. The ASET with regular EGR was in the otr trucks like the ch and vision

 

Mack AI460 AI427 AMI low torque low horsepower poor fuel mileage granite , dead dog , remediation

All the info you need is here.

One guy dyno'd his after all the mods and got 497 to the wheels

 

Did you read that thread?