2BBl to 4BBl Carb Vacuum Hoses

Zillacon · Oct 8, 2010

I have switched from the factory 2bbl to a 4bbl set-up. My dist has 2 vacuum ports. I believe the outer goes to the carb and the inner port I can plug as that is just for deceleration, is that correct? Do I need that ugly vacuum advanced control valve of can I ditch that as well? Anyone have a pic of their 4bbl engine setup? Pic would help tremendously as I am installing chrome valve covers without all the factory hose crap so I would like to know what direction I need to go.

Zillacon · Oct 8, 2010

Anyone have some insite on this?

phred · Oct 8, 2010

what year engine are you working on?

Viperwolf1 · Oct 8, 2010

What emissions equipment are you using? If you don't have/need the original thermacter equipment you might as well ditch the dual vac can and go to a single.

Zillacon · Oct 8, 2010

Classic plates so no emmisions needed, its a 71. Do I need a single dist or can I Jerry rig the dual for the time being.

Viperwolf1 · Oct 8, 2010

You can plug the inner port (retard port) and just use the outer, plumbed directly to the carb.

Zillacon · Oct 8, 2010

So I assume I can toss the advanced vacuum control module and just run straight from the carb to the dist.

Viperwolf1 · Oct 8, 2010

Zillacon said:
So I assume I can toss the advanced vacuum control module and just run straight from the carb to the dist.

You can remove it.

matts70 · Oct 8, 2010

DirtDonk · Oct 8, 2010

Good pic Matt. Just goes to showcase how the different years varied slightly too. My '71 had the breather hose to a fitting on the rear of the air filter housing, from the passenger side valve cover.
Then the PCV valve itself was in the front of the driver's side and to the base of the carb.
I knew earlier Broncos were often setup your way, but didn't know when they made the change. Now it looks like it was between '70 and '71.

Good to have these comparisons.

Paul

matts70 · Oct 9, 2010

Yep, mine is a '70.

oldiron · Oct 9, 2010

That's just plain pretty !!! Well done.
Greg

2BBl to 4BBl Carb Vacuum Hoses

Zillacon

Sr. Member

Zillacon

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phred

Bronco Guru

Viperwolf1

electron whisperer

Zillacon

Sr. Member

Viperwolf1

electron whisperer

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Zillacon

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Viperwolf1

electron whisperer

matts70

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DirtDonk

Bronco Guru

matts70

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oldiron

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