Here is an example of near disaster I experienced. "Stock class" style cam with .474" lift but with very fast opening rates. Spring pressures were about 160-180 seat/360-380 open with Schubeck/Smith composite puck hydraulic lifters. Other retainers were intact, but pretty beat up. I upped the spring pressures to about 200/400 and the problem went away and valve adjustment remained more consistent between adjustments.
As for aluminum retainers.....put them in the aluminum recycling bin!
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