Rebuild a Holley Carburetor
Remove the power valve from the primary metering block with a 1-inch box-end wrench. Also unscrew both small idle-mixture screws from the metering block. The primary and secondary metering blocks and float bowls often look the same. Usually, the primary metering block has a power valve while the secondary block doesn’t. On vacuum-secondary Holleys, the primary float bowl incorporates an accelerator pump, but the secondary bowl does not. Remove the jets with a wide-blade screwdriver to prevent damage.
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