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Re: Comp Hyd. Flat Tappets
Can you post a photo of the failed lifters?
If I'm not mistaken your saying the circlip that holds the internal parts of the lifter has popped out of 2 of the lifters?
If so that indicates poor machining of the groove the circlip resides in, a mis-match of circlip and groove sizing, or just plain cheap circlips. Personally I would replace all the lifters since 2 of the16 have failed. I would also contact Oregon Cam Grinding and see if they can put a break in finish on your cam before installing the new lifters.
Good luck
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. 
RIP Bob Parks.
1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377
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