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Old 12-26-2020, 01:02 PM
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Cobra Make, Engine: Unique Motorcars 289 USRRC, 1964 289 stroked to 331, toploader
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Question

Quote:
Originally Posted by eschaider View Post
With Hydraulic roller tappets we can have access to the same breathing enhancements without the danger of premature tappet failure that plagues solid roller tappets when they are placed into day to day service as opposed to weekend race duty.

Ed
Does a solid roller have a lower life span due to some inherent design issue in the lifter itself, or is this due to other factors like higher spring pressures for running at increased rpm levels? I would not think that the solid roller would fail any quicker given an identical set up. What am I missing?
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Unique Motorcars 289 USRRC
1964 289 5-bolt block
Toploader and 3.31 rear
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