My 1st decent drive of Model A and discussion

[M2M]

Originally Posted by Synchro909

I think just about all of the four cylinder, 3 main bearing engines of the day were weak at the middle main bearing. They were simply under done for the way we drive them today. To improve its longevity, I feel a counter balanced crank is the best (though expensive) option. Prfessure feeding oil to it helps. That puts more oil through the bearing, helping to prevent it getting too warm. Probably the easiest way to look after it is to keep the speed down.
I'm sure others who have played with this longer than I will have more thoughts.

Give me some figures. How many miles have you done on a rebuilt engine you have installed? Did any of the rebuild engines you fitted to your cars fail? If so, what happened?