Quote:
Originally Posted by lovehamr
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
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Not only the valve lash, but the higher spring forces as well produce much higher impact loads.