When good is not enough, Camshaft time again.

Having run a 246/252 solid on 110 with .550 lift and 240 CFM heads, in a 360 ci with 10.6:1 that failed to pull past 5600

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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?