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Carburetor 2 Stage Power Valve

Carburetor 2 Stage Power Valve

Your Price:$28.95
In Stock
Part Number:70-1000

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2 Stage Power Valves
Included
Gasket
Holley 4 barrel and Motorcraft two stage power enrichment valve. Please be aware that you cannot replace a 1 stage valve with a 2 stage without replacing the valve cover with a larger one.

Price includes 1 power valve only.

When the engine is at idle the vacuum is at the highest and the power valve (enrichment valve) is closed. As the engine speeds up vacuum drops and the power valve opens allowing more fuel into the carburetor.

On a 2 stage power valve such as these, the 1st stage opens up at a certain vacuum, i.e. 7,0 HG. This is at partial power. At close to full power the vacuum drops to very low HG, i.e. .5. This is where the 2nd stage opens allowing even more fuel to get to the main circuit.

The carburetor kits that include a 2 stage power valve are using OE specifications.

For other applications you will need to test the HG by hooking a vacuum meter to the engine and operate the engine at power and full power.

Changing from a 1 stage power valve on a carburetor that requires a 1 stage, to a 2 stage power valve is not recommended. If you aren't sure of what you are doing, you could cause too much fuel to be dumped into the carburetor.
5 Stars
DIYer
Product and service are excellent. I submitted a question about which valve was needed for my application and received a prompt answer. Part was shipped and arrived promptly. Installed the part and it worked great. Thanks.
Did you find this helpful?  1 of 1 Found Helpful
Reviewed by:  from loveland. on 4/23/2017
5/5
5 Stars
Power valve
Great parts and suppliers
Did you find this helpful?  1 of 1 Found Helpful
Reviewed by:  from Texas. on 9/7/2016
5/5
5 Stars
PV use.
Mikes was helpful and very fast with shipping. From what I have found their prices and range of PV's is excellent. Thanks, C~
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Reviewed by:  from Colorado. on 1/23/2018
5/5
3 Stars
Adjustment Procedure Not Available
I purchased a user-adjustable power valve for my Holley carb, but was unsure how to make the adjustment. I called and spoke to someone on the phone, but they were unable to explain how to make the adjustment. I used another valve, but I'll keep this one if I need to make changes for altitude or ? Instructions should have been included. If I didn't have the other valve, I'd be figuring out how to do it somehow. Meanwhile, the motor is running fine, so I'm going with it.
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Reviewed by:  from San Diego. on 11/26/2017
3/5
5 Stars
2-stage power valve
This is what the factory recommends for a Motorcraft 2-barrel carb. for my 1977 CJ-7. I've had the Jeep 36 years, and like to keep it to factory spec's, it runs and preforms like new.
Did you find this helpful?  0 of 1 Found Helpful
Reviewed by:  from Kingman, AZ. on 10/14/2013
5/5
5 Stars
Purchaser
Mike, Thanks for getting me the correct power valve for my 1979 Jeep 304 v-8. Installed it and everything worked fine. Ed Young
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Reviewed by:  from Gardnerville, Nevada. on 9/14/2013
5/5

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