How to rebuild automotive carburetors
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| + | ===Power valve=== | ||
| + | The Holley carb uses a power valve to supply additional fuel when the engine vacuum drops (and presumably the engine load increases). The amount of fuel it supplies is equal to about 7-8 jet numbers. If the rear power valve (if present) is removed, the threaded hole it was in has to be plugged. The jets have to be enlarged 7-8 jet sizes to compensate for the loss of fuel flow it provided. | ||
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| + | [[File:Holley pv stamping1 id.jpg|thumb|left|400px| Holley power valve vacuum rating]] <br style="clear:both"/> | ||
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===Transfer slot=== | ===Transfer slot=== | ||
Baseline the throttle blades to give a transfer slot to look like the image below. | Baseline the throttle blades to give a transfer slot to look like the image below. | ||
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