When good is not enough, Camshaft time again.

PRH said
Could you clarify the part about won’t go past 5600?

Is it that it peaked at 5600 and then the power started falling off after that?
Or the motor protested strongly when trying to exceed 5600?
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Car stopped pulling at 5500-5600 with a 750 CFM. I flogged the **** out of it, but the power production wasn’t there. It got up there in a hurry! 32/12.5/15 with 4.57 gear 3200#.