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Old 04-14-2005, 08:01   #1 (permalink)
Joe
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351C question

have a 1972 Mustang with a 351C, 4-V. I'm replacing the stock
Motorcraft 4300D that's on it with an Edelbrock 750 cfm, because the
Motorcraft float is screwed up and the secondaries are frozen shut. As
the car is now, it won't start with the stock carb. I need to
determine if the distributor vacuum port on the stock 4300D carb is
timed (no vacuum at idle) or full (vacuum at idle). Since I can't
start it with this carb on it, I can't do a simple vacuum test. Anyone
know if this car has either timed or full distributor vacuum? Thanks.

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Old 04-14-2005, 09:01   #2 (permalink)
Nosey
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Re: 351C question

Joe wrote:
> have a 1972 Mustang with a 351C, 4-V. I'm replacing the stock
> Motorcraft 4300D that's on it with an Edelbrock 750 cfm, because the
> Motorcraft float is screwed up and the secondaries are frozen shut.
> As the car is now, it won't start with the stock carb. I need to
> determine if the distributor vacuum port on the stock 4300D carb is
> timed (no vacuum at idle) or full (vacuum at idle). Since I can't
> start it with this carb on it, I can't do a simple vacuum test.
> Anyone know if this car has either timed or full distributor vacuum?
> Thanks.


The stock advance source is most likely "ported" (from above the throttle
shafts, no vacuum at idle). Read the first section of "Vacuum Advance 101".
It's a Chevy site but the basic theory applies to Fords too.

http://www.stevesnovasite.com/forums...ad.php?t=11689


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Old 04-14-2005, 21:01   #3 (permalink)
Whole Lotta Tom
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Re: 351C question

Joe wrote:
> have a 1972 Mustang with a 351C, 4-V. I'm replacing the stock
> Motorcraft 4300D that's on it with an Edelbrock 750 cfm, because the
> Motorcraft float is screwed up and the secondaries are frozen shut.
> As the car is now, it won't start with the stock carb. I need to
> determine if the distributor vacuum port on the stock 4300D carb is
> timed (no vacuum at idle) or full (vacuum at idle). Since I can't
> start it with this carb on it, I can't do a simple vacuum test.
> Anyone know if this car has either timed or full distributor vacuum?
> Thanks.



Stock, ported vacuum is used. Your car may or may not have the water temp
valve that switched to manifold vacuum when the water temp gets high, but
normally it's ported.

I use manifold vacuum, but I limit the advance travel to 10 degrees. It's
adjustible using an allen key into the hose nipple.

--
Tom
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