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73-87 Chevy _ GMC Trucks => 73-87 Chevy & GMC Trucks => Topic started by: rwalk911 on July 04, 2014, 12:11:38 pm

Title: vacuum lines
Post by: rwalk911 on July 04, 2014, 12:11:38 pm

I have a 1981 Chevy c10 that was originally a diesel, but has a Chevy 350 in it now. It has a 1406 Edelbrock carburetor on it, but I am not sure what vacuum lines go where. I also don't know if a line should run from the brake booster to the carb or intake. Also, where does the transmission vacuum line attach?

Title: Re: vacuum lines
Post by: winky on July 04, 2014, 12:42:07 pm

my trans vacuum line on my 77 was on the intake and so was my brake booster. i don't think the location matters too much but i may be wrong.

Title: Re: vacuum lines
Post by: bd on July 04, 2014, 12:59:18 pm

Manifold vacuum tee for brake power booster and auto trans (http://www.summitracing.com/parts/rsd-imf68rs/overview/)

Title: Re: vacuum lines
Post by: winky on July 04, 2014, 01:01:41 pm

this is a  vacuum diagram for an 81 305 federal, Auto trans, And California smog. it should be the same concept for what you need though. i would run the manifold vacuum to my brake booster, then run vacuum off the carb to the trans, and pcv valve, and the distributor. some intakes came with a fancy "tree" that plugged into the intake and had 6 vacuum ports. im sure someone else will chime in.


EDIT:

BD beat me to it.. lol

Title: Re: vacuum lines
Post by: rwalk911 on July 05, 2014, 09:35:37 am

Thanks for the help, but I can't figure out where the line goes on the brake booster side. Does anyone have an actual pic?

Title: Re: vacuum lines
Post by: bd on July 05, 2014, 10:23:45 am

The brake booster hose connects to the 3/8" nipple on the manifold vacuum tee (http://www.summitracing.com/parts/rsd-imf68rs/overview/).  The manifold vacuum tee typically threads into a 3/8" NPT port near the intersection of the #8 and #5 runners, directly behind the carburetor (see image, below).

Title: Re: vacuum lines
Post by: bd on July 05, 2014, 10:33:07 am

The 11/32" vacuum hose connects to the booster through a plastic check valve.