[PoPoT]

Not too long ago I bought a 66 with a 289 that has a holley street avenger carb....never saw one before, always had the old autolite/ford carb....anyway, besides a very fast idle, there is no vacuum line running from the distributor to the carb, the ports are plugged....is this common on a holley carb? I also see the pcv hose is connected to a port on the rear of the carb base and according to holley the pcv port is located in the front left of the carb.....any help and/or suggestions is deeply appreciated.
Oh yea, how do you tell if it is a 570, 670 or 770 cfm????

[The Greek]

The PCV is connected to the power brake port instead of Holley's dedicated PCV port. Both ports are manifold vacuum and it doesn't really make any difference which one is used as long as it's manifold vacuum. Personally I use Holley's dedicated PCV port.

The high engine RPM can be caused by a vacuum leak, among other things. Installing the wrong PCV valve can be part of the problem or it can be stuck open, causing a vacuum leak. They are calibrated and you need to check to see if it's the one for your engine. Another common vacuum leak source is where the intake manifold meets the cylinder heads.

There are two ways to connect the vacuum advance. I prefer using the small port located at the carb base which is full manifold vac. This may be called the "Accessory port". The other is "Timed Vacuum" which delivers vacuum only after the throttle is opened. It's also called the "Spark port". This port is usually located on the passenger side of the primary metering block, just above the idle mixture screw on Holleys. You'll need to see which port gives the best results for your engine. There's a lot of debate as to which port is best to use. If your distributor is equipped with a vacuum advance, I strongly recommend that you use it.

To determine which size carb that you have, look on the choke horn. There will be the word "List" with a series of numbers. Holley's web site shows the List numbers and there you will find the specs for the carb. They will also have the instructions for your carb on their site.

[PoPoT]

thanks Greek...I didn't know about a calibrated pcv valve, thought they were all the same, if the ball shook, it's ok....gonna hook up the vacuum to the dist. today

[PoPoT]

Originally Posted by PoPoT

thanks Greek...I didn't know about a calibrated pcv valve, thought they were all the same, if the ball shook, it's ok....gonna hook up the vacuum to the dist. today

It's a 570 cfm.....hooked up the vacuum line to the dist. and the car ran horrible, very rough....disconnected and plugged the lines and it ran very smooth but again fast idle.....gonna hook up a vac gauge and adjust the fuel/air screws I guess...maybe the timingis advanced too much.....will hopefully get to it today....

[gtjoe]

I hvae no experience with that particular type of carb, but if you have a vacuum advance distributor and don't have vacuum going to it, you have NO advance.

[PoPoT]

Originally Posted by gtjoe

I hvae no experience with that particular type of carb, but if you have a vacuum advance distributor and don't have vacuum going to it, you have NO advance.

OK so don't , what does no advance mean to me in regards to timing and stuff....can't do it???? Vacuum is something I help the wife with in the house, that's about it for me......