I have installed a 4.10 pumpkin in the rearend and I will be running 235/85 R16s. My motor is the original 216 which I rebuilt myself. I expect to do 50 mph at just under 2200 rpm. That is a high as I want to run the revs on the motor, on a constant basis. During the rebuild I installed aluminum pistons of similar design to the original iron ones and I converted the rods to inserts. The rods are very difficult to re-babbitt because they use a very thin layer unlike other babbitted rod motors.
