Cliff, 5800rpms is nothing for a HR lifter. I don't find the weight of the lifter to near as important as the weight of the valve and retainer.
I have some BBC HR engines that turn well over 6500rpms. I have a foolish customer that regularly turns an engine over 7200. The only thing I have seen is some valve float indications from that engine. I increased the seat pressure to 145ex/150in and sent it back out.
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