PCV valve install question

[bigd1101]

So folks, I have this coming from JAMCO and got the install instructions down, I hope, but it says that this will raise the RPM's a tad....OK. So do I have to adjust the two screws on the carb or just idle her down a bit? Thanks as always.....

Don

https://www.jamcosuspension.com/prod...ve-kit-pcv4953

[JayChicago]

Both. This, I think, is the theory:
Adjusting the mixture screws will ad fuel to compensate for the little additional air coming in thru the PCV, to get the air/fuel ratio right. But then that additional air & fuel should increase the idle speed. So an adjustment to the idle speed will be needed.

[bigd1101]

Originally Posted by JayChicago

Both. This, I think, is the theory:
Adjusting the mixture screws will ad fuel to compensate for the little additional air coming in thru the PCV, to get the air/fuel ratio right. But then that additional air & fuel should increase the idle speed. So an adjustment to the idle speed will be needed.

I thought so. With that saying, I've never had a car with a Holly teapot carb. To do what you are suggesting, do I turn the two screws in or out.

Don

[JayChicago]

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Not familiar with the teapot, but I think most carburetor idle circuit mixture screws are regulating a fuel passage. So you would screw out a little, to let a little more fuel to pass.