440 info

Is the block stamped 440-3 somewhere on the right side of the block? This would be another way of designating a 440 MH motor. These motors are fairly similar to a 440 lookswise,however, there is some differences. The heads on the -3 contain peanut shaped cooling passages around the sparkplug holes for extra cooling. I am not totally sure if all of these motors had sodium filled exhaust valves. Depending on who you ask, these motors did come with roller timing chains with steel gears. They are just built in mind for a heavier duty, most of the geometry is the same. Horsepower is fairly close to a regular truck 440 with power ranging between 225 to 255 net horsepower, depending on year, from my recollection. The most important spec would be the low end torque that these mills put out, somewhere in the range of 335 to 365 ft-lbs net, depending on year. These are iron tough motors, probably the best MH engine ever made, next to diesils. Mine has 99,000 miles. I've been working on it with my dad since I was 5. Now im 21 and I still drive it now. Runs awesome,with some add-ons, plus its in a smaller 19ft. '81 Dodge Brougham van conversion. Hope this helps.