For the record --- the Cummins 4BT weighs in right at 750 pounds. Available HP ranges are(stock) 80 to 130...(modified) up to over 800. They are known as "paintshakers" for a reason but it is not difficult to minimize with proper mounting (fluid mounts located above the crankshaft centerline).
And the one shown in the pair of pix does not have charge air cooling (intercooler) which makes installation a lot easier in an old, narrow nosed vehicle. I know because I'm in the process of stuffing an intercooled 4BTAA into a '46 Chevy 1.5 Ton school bus and fitting everything involved with cooling (radiator, intercooler, trans cooler & A/C) is a major issue.
Mine engine is a "two wire" motor (all mechanical) with 130hp and 355#'s of torque which is way more than originally pulled the vehicle. Paired with a new Allison, double OD 6-speed (2200MH) the calcs put my highway speed at about 65 with a stock rear end while running the engine at its' "sweet spot" of 1800rpm. Should easily get about 25+ mpg in that rpm range. All the calcs were run by Stewart & Stevenson based on several pages of input data.
Great little motors, but only if you match them to your expectations. My plan was developed based on lots of long haul cruising with better than average mpg and minimal maintenance. But like everything else in life...we'll just have to see how well the "plan" and reality merge.
Onward!
