Re: Schubeck lifters
If the ceramic foot lifter always stays in contact with the cam the lobe, then the ceramic foot is a lot less likely to shatter. Issue (as far as I'm concerned) is that the optimal performing stocker camshaft will incorporate some amount of loft (cam/lifter separation for increased dynamic lift) incorporated into the design, therefore I'd only consider a steel/DLC coated flat lifter for a stocker application. Some of you may even be lofting and don't know it, or might find out when you have a failure.
In addition to the Precision steel lifters mentioned, I've used the Ferrea lightweight steel SBC flat lifters with the foots polished, successfully in a 8200 rpm SBC on a nitrided cam core.
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