Holley Power Valve Experimentation

RustyRatRod said

I wonder about removing the discs and putting some washer(s) between the spring and disc?

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If adding washer(s) I’d use a soft copper washer and make a straight cut, give it a tweak to work it over the stud, and bend it back to flat and put the spring on. I’m pretty sure shimming the spring would only add preload.