Valve Clearance on Larger Camshaft and Flat Top Pistons

Newbomb Turk said
Because ALL rockers worth a **** are not built to the nominal ratio.
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This and
mopowers said
How is that? Do checking springs add additional valve movement? I'm having a hard time picturing that in my head.
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Light springs can't duplicate deflection and load the valvetrain experiences with stiffer springs