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Old 04-14-2019, 09:56 PM   #2
40 Deluxe
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Join Date: May 2010
Location: now Kuna, Idaho
Posts: 3,031
Default Re: Model 59 Holley Carburetor - Is it an Economizer Valve or a Power Valve?

I don't have pictures, but if you're refering to the external valve, that is a spark control valve. Although it appears similar in appearance to a power/economizer valve, it has an entirely different function and will not interchange. the power (or economizer) valve is internal.
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