Just an FYI, the twin cams can and do sump. They just don't run out of oil and blow up.
Most people never notice since the power isn't effected till about 4500 rpm. Usually it shows up on a dyno pull, or after a high pressure spring is installed with an oem pump. I've seen a few that wouldn't dead rev past 4000 rpm.
Yes I have actually heard of this but have never seen it myself. But again maybe never noticed one that did like you say. Might try and check a few more of them to see what I find.
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