Vacuum question/already referenced diagrams - The 1947 - Present Chevrolet & GMC Truck Message Board Network

gramps77 · 05-07-2012, 12:01 AM

Just installed a 700R4 and an Edelbrock intake with Holley 670 Street Avenger. I am in CA but the truck is a Heavy Half ton and according to last smog, only needs to keep the smog pump. I have all my vacuum lines connected with the exception of the fuel evap canister (1/4") and the bellows looking thing next to the heater/ A/C box (also 1/4"). The only vacuum sources left are the "timed spark" on the side and the full manifold vacuum on the front (both 3/16").
Im assuming I can T them both to the full manifold on the front. Am I going to have any issues with the size difference?
I almost forgot, I also have a 3/16" line coming off the smog pump valve. Where should that be connected?

gramps77 · 05-07-2012, 11:03 AM

Bueller, Bueller.......

gramps77 · 05-08-2012, 11:57 PM

come on, I know one of you has the answer. stop holding out and hook a brother up

motornut · 05-09-2012, 07:45 AM

i have some pdf's not sure what would be right so...

gramps77 · 05-09-2012, 11:03 AM

Thanks Motornut, that first one was the one I needed. Hadnt seen it before but I had about 10 others with all the various versions.
Now I just hope I can hook the large vacuum lines up to the smaller ones and still have enough vacuum

05-07-2012, 12:01 AM	#1
gramps77 Registered User Join Date: Oct 2011 Location: Plumas Lake, CA Posts: 386	Vacuum question/already referenced diagrams Just installed a 700R4 and an Edelbrock intake with Holley 670 Street Avenger. I am in CA but the truck is a Heavy Half ton and according to last smog, only needs to keep the smog pump. I have all my vacuum lines connected with the exception of the fuel evap canister (1/4") and the bellows looking thing next to the heater/ A/C box (also 1/4"). The only vacuum sources left are the "timed spark" on the side and the full manifold vacuum on the front (both 3/16"). Im assuming I can T them both to the full manifold on the front. Am I going to have any issues with the size difference? I almost forgot, I also have a 3/16" line coming off the smog pump valve. Where should that be connected?

05-07-2012, 11:03 AM	#2
gramps77 Registered User Join Date: Oct 2011 Location: Plumas Lake, CA Posts: 386	Re: Vacuum question/already referenced diagrams Bueller, Bueller.......

05-08-2012, 11:57 PM	#3
gramps77 Registered User Join Date: Oct 2011 Location: Plumas Lake, CA Posts: 386	Re: Vacuum question/already referenced diagrams come on, I know one of you has the answer. stop holding out and hook a brother up

05-09-2012, 11:03 AM	#5
gramps77 Registered User Join Date: Oct 2011 Location: Plumas Lake, CA Posts: 386	Re: Vacuum question/already referenced diagrams Thanks Motornut, that first one was the one I needed. Hadnt seen it before but I had about 10 others with all the various versions. Now I just hope I can hook the large vacuum lines up to the smaller ones and still have enough vacuum



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