Possible Vacuum Issues

Reply Subscribe

Thread Tools

Search this Thread

Sep 27, 2011 | 09:10 PM

76f350spercamprspeal

Thread Starter

Hotshot

Joined: Aug 2007

Posts: 12,183

Likes: 18

From: St. Charles, Missouri.

Possible Vacuum Issues

Today I was showing one of my family friends my truck and he told me I am missing a vacuum line. I also found out I have a Edlebrock Performer Series 1406 Model 600CFM. My dad tells me the same thing, and that I should have a line going from that into the back of my carburetor.

(On this image below, should there be a line on this nipple...?

The truck did run worse the last time I drove it, I attributed this to low quality fuel, as it was back firing as soon as I let up off the gas.

Also, anyone know what these casting numbers on my exhaust manifold mean?

Thanks for any all help, God Bless!

-Anthony.

Sep 27, 2011 | 09:17 PM

Sw1tchfoot

Posting Guru

Joined: Oct 2010

Posts: 1,199

Likes: 1

From: Missouri

That is for the vacuum advance, for an edelbrock I believe the timed port is the one that is a little bit higher on the carb. Like on your first picture below the "Edelbrock" logo you see three capped vacuum ports. There is one large port for the PCV and then two smaller ones; one is located higher than the other. The lower one is full manifold vacuum and the higher one is ported. (timed/ported) Ported should do just fine for you, some people (myself included) use full manifold vacuum with aftermarket cams.