Old autoshop teacher explained why almost 50 years ago. The reasons mentioned above are why. Don't fill the cavity between the inner and out bearings completely and don't forget to put a coating on the inside of the dust cap to prevent rust there too.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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