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Ported Vaccuum?
#1
Going from a 2bbl to a 4 bbl cab and I need to know if the distributor needs ported vacuum?

Tim

Thanks

Tim
Tucson, Az
1973 SportsRoof
351C bored .040
Crank .020  and Stock cam
Flattop pistons
Edelbrock 4bbl CARB 800 CFM ELEC CHOKE
Edelbrock Performer 2750 Intake Manifold

[Image: NewPrimedHood_zpsw2jaj0cu.jpg]
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#2
MY swap from oem 2V to 4V involved the factory intake replaced with an Edelbrock intake, both of which use a vac connection tapped in the forward area of the intake. That was how Ford designed it and always worked just fine with my new Holley and factory dist.
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#3
There are to vacuum ports on my new Edelbrock carb. One is time/ported the there is not. It designed handle the the distributor vacuum...just double checking which one I need to connected up to.




wwhite72;289697 Wrote:MY swap from oem 2V to 4V involved the factory intake replaced with an Edelbrock intake, both of which use a vac connection tapped in the forward area of the intake. That was how Ford designed it and always worked just fine with my new Holley and factory dist.

Thanks

Tim
Tucson, Az
1973 SportsRoof
351C bored .040
Crank .020  and Stock cam
Flattop pistons
Edelbrock 4bbl CARB 800 CFM ELEC CHOKE
Edelbrock Performer 2750 Intake Manifold

[Image: NewPrimedHood_zpsw2jaj0cu.jpg]
  Reply
#4
I have had better luck running my vac advance on the ported vac. Other opinions differ.

73 Grandé H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, Quick Fuel 750 CFM double pumper, AirGap intake.

- Jason


[Image: 082-hot-rod-power-tour-2017-1970-1970s.jpg]
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#5
73pony is right. lots of opinions. I believe GM used ported and Ford used constant and that is why aftermarket carbs have both available. I left both plugged on the Holley and used intake port because it looked original.
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#6
I just did a bit of checking by Googleing Mustang vacuum systems. I'm not sure how to add the diagram, sorry. www.allfordmustangs.com/forum/attachments/classic-tech/344298d1399590285-19 . OOPs, that link no longer works, just Google it.
As I understand it. most, if not all 351C's had a distributor vacuum control valve with a dual vacuum distributor. The hose that went to the manifold port was connected to the bottom port on that valve and the hose was T'd into the rear retard port on the dizzy vac can. The advance hose connected to the top in and out ports and then to the carb. I don't think the Autolite carbs had timed ports back in the day, but then the initial was only set at 6* on most 351C. We are talking about a 351C aren't we???
I have my Holley 4160 4V connected to timed vacuum. I no longer use the retard valve, don't really need it in our climate, so the manifold port is plugged as is the vac. port at the base of the Holley. I have good control of the timing with it set like this. It only seems to need mechanical timing at idle @14* . That's my story and I'm sticking to it!! Haha
Timing has been gone over tons of times and opinions differ as much as the weather, but I found very useful info at www.bob2000.com/dist.htm Timing tips for Ford distributors. Kind of explains in simple terms which I needed for sure.
Hope this helps,
Geoff.
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#7
I also use ported vacuum, to me it makes for a more predictable steady idle especially with an automatic transmission when going from park to drive.

351w - Ford racing GT40X 178 cc aluminum heads - Ford racing(crane) 1.7 roller rockers - Comp Cams 280H magnum cam .544" / .544" lift - ARP hardware - hedman longtubes - magnaflow exhaust with X pipe - Duraspark - MSD digital 6al box - MSD TFI coil - optima red top battery - tuff stuff 140 amp alternator - weiand stealth intake  - edelbrock 1406 600 carb  - march pullies and brackets - Be cool fan controller - derale electric fan - FMX trans - motive 4.11 gears - traction lok - lakewood traction bars.                                            










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#8
Mikes73;289789 Wrote:I also use ported vacuum, to me it makes for a more predictable steady idle especially with an automatic transmission when going from park to drive.

Right on Mike!
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#9
Thanks Brutha! I hook it up to the left port on the Eddie carb Tim.

351w - Ford racing GT40X 178 cc aluminum heads - Ford racing(crane) 1.7 roller rockers - Comp Cams 280H magnum cam .544" / .544" lift - ARP hardware - hedman longtubes - magnaflow exhaust with X pipe - Duraspark - MSD digital 6al box - MSD TFI coil - optima red top battery - tuff stuff 140 amp alternator - weiand stealth intake  - edelbrock 1406 600 carb  - march pullies and brackets - Be cool fan controller - derale electric fan - FMX trans - motive 4.11 gears - traction lok - lakewood traction bars.                                            










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#10
Thanks everyone. Ported Vacuum it is. At some point I'm going to diagram it all out - to include the A/C vacuum unit for when the car is at idle....if it's needed.

Thanks

Tim
Tucson, Az
1973 SportsRoof
351C bored .040
Crank .020  and Stock cam
Flattop pistons
Edelbrock 4bbl CARB 800 CFM ELEC CHOKE
Edelbrock Performer 2750 Intake Manifold

[Image: NewPrimedHood_zpsw2jaj0cu.jpg]
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