help identifying vacuum ports on a quadrajet - The 1947 - Present Chevrolet & GMC Truck Message Board Network

crm318 · 12-10-2006, 10:41 PM

i am trying to find the direct and ported vacuum ports on my quadrajet. im trying to hook up my vacuum advance and i was told to put it on the ported one. (i currently have it on the port sticking out of the passenger side of the carb).

motopatzo · 12-10-2006, 11:18 PM

Just pull a vacuum line off the carb while it's running at idle, and if you feel vacuum when you put your finger on it, it's manifold vaccum. If you have no vacuum, just open the throttle a bit and if there is vacuum off idle, it is ported.

*MisterMan* · 12-11-2006, 02:08 AM

Quote:

Originally Posted by crm318

i am trying to find the direct and ported vacuum ports on my quadrajet. im trying to hook up my vacuum advance and i was told to put it on the ported one. (i currently have it on the port sticking out of the passenger side of the carb).

on my 71 the vaccume advance for the timing is on the drivers side.

crm318 · 12-11-2006, 01:22 PM

thanks guys. ill give it a look over.

12-10-2006, 10:41 PM	#1
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	help identifying vacuum ports on a quadrajet i am trying to find the direct and ported vacuum ports on my quadrajet. im trying to hook up my vacuum advance and i was told to put it on the ported one. (i currently have it on the port sticking out of the passenger side of the carb). __________________ 1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies

12-10-2006, 11:18 PM	#2
motopatzo Registered User Join Date: Oct 2006 Location: maple ridge, b.c., canada Posts: 190	Re: help identifying vacuum ports on a quadrajet Just pull a vacuum line off the carb while it's running at idle, and if you feel vacuum when you put your finger on it, it's manifold vaccum. If you have no vacuum, just open the throttle a bit and if there is vacuum off idle, it is ported.

12-11-2006, 01:22 PM	#4
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	Re: help identifying vacuum ports on a quadrajet thanks guys. ill give it a look over. __________________ 1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies



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