I've now had my project on the road for about 3 weeks. The 617 is a perfect match to the truck. It has plenty of pep, isn't quite as loud as I expected in the cab and fuel economy looks to be what I expected. When I filled the tank, I had been 254 miles and it held 10.1 gallons for an average of 25.1 MPG. I am using the 126 speedo mounted into the original gauge cluster and it is within 1 MPH at 60, so the odometer should be very close.We have been to 2 local car shows with it and people love it, the concept of a MB diesel in an effie just blows them away. Looks like I'll drive it this summer and then decide this fall whether to keep it as is or tear it back apart for final body work and paint.
This was an unexpected surprise yesterday, we won a 3rd place trophy out of 6 trucks in the class.

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1971 R600 Mack toterhome (SuperDawg)
99 NU-WA Snowbird 34+2 SE 102 5er
If it's not diesel, it's not in my stable!
53 F100 617.951/auto
95 Dodge 3500 Cummins/5 speed service truck