Quote:
Originally Posted by FUNFER2
I'll add this also. Some people are concerned about the needle bearings of a roller cam falling apart and causing problems but, the hydraulics,... also have bearings, unlike a solid flat tappet.
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You have to remember that the needle bearings in a solid lifter are going to experience much higher impact loads because of the lash inherent to a solid. The hydraulic lifters are always in contact with the cam lobe so that is much less of an issue, hence the documented difference in survivability of the solid vs. hydraulic lifters during extended operation.
Steve