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The only drawback to the rev kits for the motors that they are available for--is that you can't change cams quickly between qualifying periods or heat races/rounds---anything that you can do to eliminate some of the force from the valve tip/keeper/retainer is vital and keeping the roller on the base circle of the cam is minor compared to being able to eliminate that shear force up top--
of course , I probably only have 8 to 10 bushels of used valve springs
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