410 LA small block will not rev past 6000

Here’s a 416 bracket race combo with mild ported RPMs(270-ish).
Longer duration old school Chevy lifter SFT cam(easy on parts), and higher CR.
Notice how the power just tapers off at the top end.
That’s what running out of air looks like…….. as the VE numbers are falling pretty quickly.

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Gradual up, plateau, gradual down. Can’t beat that.