410 LA small block will not rev past 6000

Newbomb Turk said

Yeah, I originally said head limits but that was before I figured out it's a hydraulic lifter.

I haven't messed with any hydraulic stuff since the early 2000's but back then, to get any RPM out of them we went to 20w50 oil and bigger pushrods and that was good for some RPM.

At this point I think they started going the other way...lighter oils. I don't pay much attention to hydraulic anything any more.

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Maybe At the end there above 112 mph (around 6000 rpms),

But the engine hp is peaking at 94 mph (around 4800 rpms and 2nd peak around 101 mph (5200 ish) and pretty flat to 110-112 mph. Isn't that an issue that this engine hp peaks so low, and would it be an hydraulic issue at those low rpms?

To me it looks like their just letting off the gas around 112 mph maybe there's a slight issue just before they do.