Edelbrock vacuum advance port - The 1947 - Present Chevrolet & GMC Truck Message Board Network

71sub · 08-04-2003, 11:22 PM

Question on a 1406 --- 600cfm carb.

On two front vacumm ports --- the one on the drivers side has good suction BUT the one on the passenger side has nothing.

The one with nothing is the vacuum line I have connected to the HEI distributor. Is the the carb supposed to show suction or the distributor ?

If it's the carb, and it shows nothing -- how do I fix that ?

crazy longhorn · 08-04-2003, 11:43 PM

the pass side is ported vacumn, & wont show on a vac guage till the throttle is opened slightly......it also drops under full throttle, like the manifold vac fitting on the dr side. Your HEI was setup to run ported vacumn, & if you are running stock or very mild you may want to leave it that way. If you do a "recurve" & adjustable vac can on the dist, i would hook the dist to manifold vacumn. good luck,crazyL

71sub · 08-04-2003, 11:56 PM

Thanks Loco !

So, at idle I will not feel the ported vacuum inlet suck my finger, under under acceleration yes AND at WOT it'll fall down some ?

crazy longhorn · 08-05-2003, 12:08 AM

Yup, @ WOT it should drop completly off(under a load)

08-04-2003, 11:22 PM	#1
71sub Registered User Join Date: May 2002 Location: Stockton, CA Posts: 169	Edelbrock vacuum advance port Question on a 1406 --- 600cfm carb. On two front vacumm ports --- the one on the drivers side has good suction BUT the one on the passenger side has nothing. The one with nothing is the vacuum line I have connected to the HEI distributor. Is the the carb supposed to show suction or the distributor ? If it's the carb, and it shows nothing -- how do I fix that ? __________________ 71 C/10 : 350 / 700r4 ; Ford 9" posi 3.50 with 31x10.5 rear tires, single drive shaft, C-notch, 2.5" drop spindles, keyless entry 71 Suburban 350/350 -- caddy tail lights, keyless entry, late model seats, billet Autometer instrument cluster 70 Ford Torino -- 351W (balanced & blueprinted ), C4, VDO gauges

08-04-2003, 11:43 PM	#2
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	the pass side is ported vacumn, & wont show on a vac guage till the throttle is opened slightly......it also drops under full throttle, like the manifold vac fitting on the dr side. Your HEI was setup to run ported vacumn, & if you are running stock or very mild you may want to leave it that way. If you do a "recurve" & adjustable vac can on the dist, i would hook the dist to manifold vacumn. good luck,crazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

08-04-2003, 11:56 PM	#3
71sub Registered User Join Date: May 2002 Location: Stockton, CA Posts: 169	Thanks Loco ! So, at idle I will not feel the ported vacuum inlet suck my finger, under under acceleration yes AND at WOT it'll fall down some ? __________________ 71 C/10 : 350 / 700r4 ; Ford 9" posi 3.50 with 31x10.5 rear tires, single drive shaft, C-notch, 2.5" drop spindles, keyless entry 71 Suburban 350/350 -- caddy tail lights, keyless entry, late model seats, billet Autometer instrument cluster 70 Ford Torino -- 351W (balanced & blueprinted ), C4, VDO gauges

08-05-2003, 12:08 AM	#4
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	Yup, @ WOT it should drop completly off(under a load) __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

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