650 Holley Help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72sleeper · 10-30-2003, 04:20 PM

i have a built holley 650 that mydad got for me and i need to know where to hook the vacuums up cuase i dont know and he dont know so he just spliced em all into one and he plugged one up wich im pretty sure controls the back barrels casue they dont open any help or diagrams would begreat thanks

ddsmith · 10-30-2003, 07:46 PM

Is the carb a spread bore or a double pumper? I have a Holley carb book and it may be helpful in solving your question. It's better to know what you have so I can give you the most correct answer.

68racer · 10-31-2003, 02:34 PM

Is it a double pumper (rear barrels open after the fronts are half open by a link on the throttle arm). Or a vacumn secondary, there is a round chamber on the opposite side to the throttle arm?

On a v/s the rears are controlled by an internal passage not the hoses. You will not see them open by revving the engine. It has to be under load, say moving at about 50mph.

Hook the vacumn advance to the port over the idle mixture screw. Everything else put where it hooks up best. Don't forget that big one on the rear of the base.

72sleeper · 11-04-2003, 04:41 PM

its v/s and the big one on the back is the only plugged one (theone on the passenger side right??) any reply to that would be great adn ill post again if i cnt find teh idle mixture screw thanks

Orence1 · 11-04-2003, 08:00 PM

The large vacumn port on the back of the carburator is usually plumbed to a PCV valve in the passenger side valve cover using 3/8" rubber hose.

10-30-2003, 04:20 PM	#1
72sleeper []D [] []v[] []D Join Date: Dec 2001 Location: h'vegas,TN,USA Posts: 78	650 Holley Help i have a built holley 650 that mydad got for me and i need to know where to hook the vacuums up cuase i dont know and he dont know so he just spliced em all into one and he plugged one up wich im pretty sure controls the back barrels casue they dont open any help or diagrams would begreat thanks __________________ Clint 72 c'10 350ci/400hp sleeper forever

10-30-2003, 07:46 PM	#2
ddsmith Glowing since 1978 Join Date: Mar 2001 Location: Lusby,MD,USA Posts: 532	Is the carb a spread bore or a double pumper? I have a Holley carb book and it may be helpful in solving your question. It's better to know what you have so I can give you the most correct answer. __________________ 66 Chevy C30 Stakebody Dump, PS,PB, 327cu in 71 Corvette Coupe 454 4 speed 69 Chevy C20 Custom Camper

10-31-2003, 02:34 PM	#3
68racer Yeah baby! Join Date: Feb 2001 Location: United Kingdom Posts: 436	Is it a double pumper (rear barrels open after the fronts are half open by a link on the throttle arm). Or a vacumn secondary, there is a round chamber on the opposite side to the throttle arm? On a v/s the rears are controlled by an internal passage not the hoses. You will not see them open by revving the engine. It has to be under load, say moving at about 50mph. Hook the vacumn advance to the port over the idle mixture screw. Everything else put where it hooks up best. Don't forget that big one on the rear of the base. __________________ 11.37 @116

11-04-2003, 04:41 PM	#4
72sleeper []D [] []v[] []D Join Date: Dec 2001 Location: h'vegas,TN,USA Posts: 78	its v/s and the big one on the back is the only plugged one (theone on the passenger side right??) any reply to that would be great adn ill post again if i cnt find teh idle mixture screw thanks __________________ Clint 72 c'10 350ci/400hp sleeper forever

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11-04-2003, 08:00 PM	#5
Orence1 Registered User Join Date: Jan 2000 Location: Bothell, WA Posts: 548	The large vacumn port on the back of the carburator is usually plumbed to a PCV valve in the passenger side valve cover using 3/8" rubber hose.



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