You can get a lot more mileage out of your engine if you use aluminum pistons when you rebuild your engine. The main reason the babbit goes bad is the inertial forces caused by the heavy pistons. I talked with a 39 owner who uses babbeted rods and drives 70 mph regularly with no damage because he put in aluminum pistons. I bought a set of .030 over aluminum pistons that I'm going to use when it's time to rebuild my 38.

Save a life, adopt a senior shelter pet.
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Name your dog Naked so you can walk Naked in the park.