SixSpeed

Do you know what the numbers should be? I am trying to find out. Here are a few more things I found on the engine. Most dates I could find on cast items were 80-82. There's a pile of numbers hand stamped on the passenger side of the block towards the rear on a flat machine surface. I'll have to clean it up and have a look at them

Interesting information and much appreciated! Here is a closeup shot of the gearcase. And a few more photos I hadn't uploaded. The motor I think has definitely been out of the truck. Rebuilt/Reman'd or straight out swapped I am not sure. I tried to read through all the old threads I could find before I bought this truck for the Maxidyne. I thought it LOOKED like a Maxidyne and he said it had the Maxidyne tag so I was surprised when ai got home and the case said 673! there is definitely a lot of knowledge around, hopefully I can track one of them down. Thanks again!

Hello, I purchased a truck to use for a motor for my Mack and I am looking for clarification on what it is/specs. The Engine # says its a T673C, but the tag says Maxidyne and it looks like a 675 (237) to me. The motor has been rebuilt at some point. The Turbo is an AiResearch unit "Remanufactured for Mack" and painted in the same coat. Few questions: 1.) Is is possible for this T673C to be rebuilt to Maxidyne specifications? 2.) Would there be any difference in this vs. a 675 then? 3.) How would i figure out what horsepower this engine is set at? 4.) Are exhaust/Intake manifolds interchangable between 673, 675 etc? I need to switch to a side/bottom mount turbo rether than top. Thanks!