1957 Holley 4000 Power Valve upgrade

[Shawnski]

I’m interested in changing the stock power valve in my 1956 to a 4.0hg. Does anyone know where this power valve can be obtained?

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[biddle]

Put the model year in the subject on future posts as prompted. Added for you.

 

[74 Harley]

Have you tried Summit racing?

 

[Shawnski]

I've looked and the power valves they sell look similar, but different t if that makes any sense... The ones in the original Holley 4000 don't have the exposed spring and I think they are a little shorter. I bought a complete rebuild kit and the hg isn't stamped on it. I believe the originals are 6.0 he which is a bit too high of a vacuum pull for these motors.

 

[cokefirst]

Contact Mike's Carburetor parts. He will have one.

 

[74 Harley]

Good luck in your search, are you having a lean burn issue? Problem may not be the power valve...