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1972 vs. 1973 351C Vacuum System
#1
So here is the last set of initial questions.

Here is an image of the current set up:
[Image: Vac-14-L_zpsndlzgozn.jpg]

[Image: Vac-13-L_zpsgbppofla.jpg]


Any diagram I find has the the vacuum from the Distr going to the Valve assy.

The Valve assy currently has nothing attached. That is located on the front right side next to the alternator.

[Image: Vac-31-L_zpsyrpi8chf.jpg]

The diagram for the 1972 351C shows the that instead of going directly to the carb, the hoses from the distributor vacuum run to the Valve Assy. There also seem to be a second line running from the back of the distributor - but that isn't very clear.

Any ideas? Clearly the car runs without any of these connected - do I just plug them all?

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
Those were added to prevent vacuum advance before the car reached a certain speed and before it reached operating temperature for emission reasons. They also tended to reduce performance, so those, along with the EGR were often bypassed.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#3
Thanks Don,

Here in AZ the car still has to pass emission. But lets say I reg it has a historic vehicle - do you just cap them off?

Tim


Don C;246522 Wrote:Those were added to prevent vacuum advance before the car reached a certain speed and before it reached operating temperature for emission reasons. They also tended to reduce performance, so those, along with the EGR were often bypassed.

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
If registering it as an antique vehicle doesn't require an inspection, yes just cap off the unused ports/connections. If it requires an inspection you'll have to run all of the hoses.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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