Vacuum line routing?

[DirtDonk]

Great looking carb by the way. And the whole engine as well!
And you're right, the stock '71 would not have had any vacuum systems attached to the air cleaner. Only later models got that. You would normally still have had the heat-riser tube to the snorkel, but nothing else.

Not aware of any factory PCV hose reproductions yet. I finally got a valve with the 90° 3/8" nipple and bent some tubing to get the cleanest routing to the new carb and simply used 3/8" fuel line to attach at each end.

Good luck. Looking great.
Oh, and glad to hear that I was wrong about the port. I was going to suggest just testing it when the engine was running, but it sounds like you got all the confirmation you need. And I agree that the vacuum brake booster should be attached to the manifold. I can't think of any other vacuum circuits needed on a '71.

Paul

 

[jckkys]

Surprised to see your air cleaner has no 5/8" hose connection on the front of the air cleaner as all the '71s I remember did. photos in road tests of '71s also had it. That leaves you little choice but to put the PVC on the left valve cover and the breather on the back of the right valve cover like the '72 and newer Broncos, where Ford used a spacer with a front PVC port. Four barrel carb spacers with front PVC ports are hard to find, especially stock Ford parts. I ended up buying a Moroso one inch phenolic and drilling a 3/8" hole with a 1/4" hole to each primary bore,then inserting a 1/8" steal nipple. This allows the use of the factory steel tube to the PVC valve on oil filler cap like my '77 had originally. The fact that 2 barrels were the only V8 carbs makes an original looking 4 barrel installation interesting.

 

[Baja71]

Great looking carb by the way. And the whole engine as well!
And you're right, the stock '71 would not have had any vacuum systems attached to the air cleaner. Only later models got that. You would normally still have had the heat-riser tube to the snorkel, but nothing else.

Not aware of any factory PCV hose reproductions yet. I finally got a valve with the 90° 3/8" nipple and bent some tubing to get the cleanest routing to the new carb and simply used 3/8" fuel line to attach at each end.

Good luck. Looking great.
Oh, and glad to hear that I was wrong about the port. I was going to suggest just testing it when the engine was running, but it sounds like you got all the confirmation you need. And I agree that the vacuum brake booster should be attached to the manifold. I can't think of any other vacuum circuits needed on a '71.

Paul

Thanks Paul!

 

[Baja71]

Surprised to see your air cleaner has no 5/8" hose connection on the front of the air cleaner as all the '71s I remember did. photos in road tests of '71s also had it. That leaves you little choice but to put the PVC on the left valve cover and the breather on the back of the right valve cover like the '72 and newer Broncos, where Ford used a spacer with a front PVC port. Four barrel carb spacers with front PVC ports are hard to find, especially stock Ford parts. I ended up buying a Moroso one inch phenolic and drilling a 3/8" hole with a 1/4" hole to each primary bore,then inserting a 1/8" steal nipple. This allows the use of the factory steel tube to the PVC valve on oil filler cap like my '77 had originally. The fact that 2 barrels were the only V8 carbs makes an original looking 4 barrel installation interesting.

This '71 had a June 30th-ish build date, so it was a very late build. My 302 also had a rear PCV port, and a long form fitted rubber hose that ran around the carb and I cannot find a replacement so far.

 

[joshnjulie1]

I have the Edelbrock 1406 and an old style dist. Doesn't the vacuum hose from the dist. hook up to the right side (full vacuum) of the carb instead of the left side (ported)?

 

[DirtDonk]

No. On an EB, or pretty much most other Fords of that vintage as far as I know, only ported spark advance was used in single-diaphragm applications.
Not sure if any other Fords got full vacuum, but I've never seen one.

And there's a 90% or better chance you wouldn't like full manifold vacuum controlling your advance anyway.

Paul

 

[DirtDonk]

Surprised to see your air cleaner has no 5/8" hose connection on the front of the air cleaner as all the '71s I remember did.

This '71 had a June 30th-ish build date, so it was a very late build. My 302 also had a rear PCV port, and a long form fitted rubber hose that ran around the carb and I cannot find a replacement so far.

That's interesting news jckys. Good to know it was an early '71 change instead of what I'd always thought of as a '70 vs '71 thing. All the '71's I've messed with, including early enough models to have the Dana 30 fronts, have had the later style air cleaner. Mine does.
Same thing for the electrical system. All the Ford books show the harness and fuse box location for the '71 as being the same as the earlier style that I'd thought was over in '70. Here again, my '71 and every one I've messed with has had the fuse panel in the glove box.
Where is yours? On the floor/firewall by any chance?

Like so many other things on EB's, this is a good bit of running-change information to keep on file.

Paul

 

[Baja71]

Well, mine is a late '71 with D44, PVC in front driver side valve cover, carb spacer plate with PVC in back, fuse box in glove box, dual vacuum distributor (one to carb, one to manifold).

 

[jckkys]

My '68 had rear PVC and my '73, '77 both had front PVC. In my parts bin I found a U shaped 3/8 steel tube from a '72 that had the PVC in front and rear PVC connection on the carb spacer. It allows the front PVC to attach with straight hose. I was going to use it on the '77 till I made a spacer with a front nipple. It is a Ford part and I won't need it so if you, do let me know I'll send it free. The vacuum retard is not helpful unless required by state emission laws. The photos in Brooklands Ford Bronco 1966-1977 pg. 39 from a road test by 4 Wheel Drive from the summer of '71 show a front air cleaner hose to the oil cap.