I would have preferred if they tested a Hy-Lift Johnson lifter rather then relying on speculation that the other brand lifters were in fact using the Hy-Lift Johnson body. Suppliers over the years frequently change suppliers depending on price and availability. Why didn't they test Comp lifters? It would have been nice to know when these lifter were manufactured but nothing in the study to indicate if it was 1995 or 2020? They all had hardness within spec but many speculate failures are due to soft lifters. I saw another video recently and tests indicated the lifters had hardness within spec but crown was an issue. Another factor, the surface anomalies in the photos, would they be considered within limits by the manufacturer? Would they actually contribute to Lifter/cam lobe failure? I would not use them based on the photos but I don't know if that condition would contribute to a failure if the hardness and crown was correct. Nevertheless interesting information.
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Tim Corcoran
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