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MY 350 JUST WIPED A LOBE. UPON INSPECTION I NOTICED THAT THE SWIRL MARKS WERE STILL NOTICABLE ON TWO OF THE LIFTERS. THIS TELLS ME THEY WERE NOT SPINNING LIKE THEY'RE SUPPOSED TO AND THE CAUSE FOR THE LOBE AND LIFTER FAILURE. WHAT ARE SOME CAUSES FOR THE LIFTER NOT TO ROTATE. THEY SPIN FREELY BY HAND WHEN I PUT THEM BACK IN TO SEE IF THERE WERE ANY BURRS.
 

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They are made convex { curved out at the bottom} to make them spin, when they wear they get flat or even convex and stop spinning.instant flat cam
 
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