73-87chevytrucks.com

73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: VeeTwin60 on March 03, 2008, 07:12:00 pm

Title: Vacuum: The Basics
Post by: VeeTwin60 on March 03, 2008, 07:12:00 pm

Hey Guys,

I would like to make sure my vacuum lines are hooked up properly.  Just the basics - no smog/emission equipment.

1986 C/10
350 Engine/350 Trans
Holley Model 4150 Double Pumper

If you could give me a "this goes to this", or a diagram (not the one under the hood - like I said, no smog equipment).  Just the simple basics.

Thanks

Title: Re: Vacuum: The Basics
Post by: Redneckchevy on March 03, 2008, 07:14:35 pm

Well i pluged all mine up but u do want the vacuum advance...PVC...And brake booster...Thats all i run...And a vacuum gauge
Ok brake booster goes to the large port on back of carb....and  pvc can go to larg one on the side.....And Ur vacuum advance goes to a source that only gets vacuum when u lay on the gas..On a holey its next to the float bowl ..now i only had one large port so i had to use a T fitting for my pcv and brake booster works well i have no probs with stoping

Title: Re: Vacuum: The Basics
Post by: ccz145a on March 04, 2008, 08:31:36 am

Of course you need the vac line going to the hvac vac resivoir (round ball on pass side in engine compartment) that operates the various air handler doors. Comes off a tee fitting on the manifold.

I have only owned AC equiped trucks, don't know if heater-only had this or not.

Title: Re: Vacuum: The Basics
Post by: Cowboy_Customs on March 04, 2008, 04:25:00 pm

Nope, no Vac. ball on the non A/C trucks.

As redneck says, there is a port on the carb by the float bowl for the Advance. Its been so long sence Ive tinkered with a Carb I have forgot how the brakes get their Vacuum. Plus the fact most of my trucks have Hydroboost......  ;D