This is why I refuse to build any engines with flat tappet cams. You can do everything right and still end up with a lobe/lifter failure... No thanks....
IMO everything was not done right on this build because the pre load was not set correctly or even checked. That does not make all flat tappet cams bad, IMO.
They are not bad. I personally will not build a engine with a flat tappet cam for someone who is paying me. You can check everything till your purple and still have a lobe/lifter fail. Not worth it... Big block Chrysler engines do not grow on trees like small block Chevys and the aftermarket could care less about Mopar because the dollars are not there. So why on earth would I risk sending metal shavings or worst case, metal chunks throughout a freshly rebuilt stock engine block because a lifter fails or a cam lobe or both
Go roller or continue to play in the sandbox
