I doesn’t make much sense to me that the variations in lifter cause issues in quality control versus a OEM making millions of something and having better quality control. JMHO… That sounds like bean counters limiting the time to finish machine to a std to produce XXXX / hr of product. Probably why better lifters cost more. Lots of GM lifters are just SBC bodies, not exactly one or two of something. My guess is cartridge is likely a different metal than the lifter body, easier and more precise to machine during mfg for closer tolerances and less time to machine. Win win for comp, hopefully better on our end too.
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