Reply to "Power Brake Vacuum"

Thanks for the reply.

Im a little concerned with using the manifold ports because they are each located right in a runner. Other manifold vacuum ports seem to be in a more central location. I called the Edelbrock help line for help. The tech said it would be OK to just use one of the ports; but he didn't seem really concerned with his job or my car.

I don't have a very good grasp of how much vacuum is used for these accessories or how much effect it has on the engine. I was thinking the PCV is always flowing so it would be more drain on the overall vacuum than the brakes that are more of a closed system. With that in mind I would use the carburetor source for the PCV and the manifold runner port for the brakes, or maybe even connect both manifold sources together to run the brakes so I would be drawing on two runners instead of just one.

My old intake was a tall single plane, I think probably Ford SVO (not sure it has been polished.) It had two ports tapped just below the carburetor for PCV and brakes. When I replaced the C302b heads I had to replace the intake thats when the issue came up. I really hoped to have the car on the street yet this year but its not looking good.