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0.020" shouldn't hurt, but I'm not sure it'll help. And you really can't go any tighter than factory spec. More lash will cause the intakes to close earlier, trapping more fresh charge in at lower RPM, wwhich should help if your cruise RPM is too low. Likewise on the exhaust, the extra lash will help low RPM torque there again.
But if your cruise RPM is too high, then the tight end of factory spec would be better.
As you improve the aero of the car, it'll like less cruise RPM, or less lash.
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