Racers sometimes will prefer to run without a power valve. In these cases a power valve plug must be used to block the power valve circuit. Furthermore, jet sizes must be increased to compensate for loss of the fuel enrichment provided by the power valve. An increase of 6 to 8 jet sizes will, in most cases, be enough compensation. It is advisable, however, to read the spark plugs and verify proper jetting.
- One Plug and Gasket
- 1/2-28 Thread
Holley Performance Emission Code 5: This part is legal for sale or use on Emissions Controlled Vehicles; Uncontrolled (Non-Emissions Controlled) Vehicles; and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations
Main jetting will need to be increased 6 to 8 sizes when plug is used.
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Holley Power Valve Plug & Gasket 26-36: