Typically, it is because the oil pump has sucked up some debris which
made it's way past the pick up screen, momentarily locking up the
pump gears. Usually, it's the umbrella seals that have disintegrated.
Might be a good idea to drop the pan and clean it out. BTW, the 351M/400
(later 351C's too I think) has a better pick up screen that won't let as
much stuff past:
http://www.bacomatic.org/gallery2/v/hidden/dan/dan-cars...g2_imageViewsIndex=1
Dan Jones
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