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Author Topic: Vacuum advance  (Read 2691 times)
Rick68
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« on: July 25, 2013, 09:31:29 PM »

I switched my vacuum advance from ported to manifold vacuum on my 396/375hp and boy what a difference.My car always ran fine but now it runs even better.I also noticed a drop in engine temperature at idle.Any time my car idled for long periods or I got stuck in traffic I would see the temp gauge slowly go up.I had it running for a 1/2 hour and the hottest it got was 197 degrees.The only problem I have is I cannot find the correct vacuum advance.I am running 12" hg at idle and my advance starts to move at 8"hg and stops at 15"hg.So my idle is a little unstable.All the part numbers listed in the forum for the vacuum advance I need are discontinued.Car Quest told me the part number is good but they are not sure they can get it.Paragon Corvette has an aftermarket vacuum advance with the correct GM part number that I need but they said they do not know if it is the right 4"hg start to 8"hg end that it is supposed to be. I don't want to spend 45.00 and it is the wrong one.Has JohnZ  ever dealt with Paragon Corvette?They have 6 different advances listed with different part numbers.I just want to know if all the advance units are the same vacuum pull but have different numbers stamped.IN NCRS judging I guess they check numbers like that.Someone who has a NCRS corvette is probably more interested in the correct numbers than drivability.
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jeff68
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« Reply #1 on: July 26, 2013, 07:37:25 AM »

What vacuum advance are you looking for?  NAPA should have a good selection available.
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68 L30 / M20 Convertible
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« Reply #2 on: July 26, 2013, 08:32:29 AM »

I switched my vacuum advance from ported to manifold vacuum on my 396/375hp and boy what a difference.My car always ran fine but now it runs even better.I also noticed a drop in engine temperature at idle.Any time my car idled for long periods or I got stuck in traffic I would see the temp gauge slowly go up.I had it running for a 1/2 hour and the hottest it got was 197 degrees.The only problem I have is I cannot find the correct vacuum advance.I am running 12" hg at idle and my advance starts to move at 8"hg and stops at 15"hg.So my idle is a little unstable.All the part numbers listed in the forum for the vacuum advance I need are discontinued.Car Quest told me the part number is good but they are not sure they can get it.Paragon Corvette has an aftermarket vacuum advance with the correct GM part number that I need but they said they do not know if it is the right 4"hg start to 8"hg end that it is supposed to be. I don't want to spend 45.00 and it is the wrong one.Has JohnZ  ever dealt with Paragon Corvette?They have 6 different advances listed with different part numbers.I just want to know if all the advance units are the same vacuum pull but have different numbers stamped.IN NCRS judging I guess they check numbers like that.Someone who has a NCRS corvette is probably more interested in the correct numbers than drivability.
if you talk to the right person at Paragon, I'd bet they can answer your question; they have been the BEST Corvette supplier for a long while...
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Gary W.  /  69Z28-RS, 72 B 720 cowl console rosewood all tint
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Ed Bertrand
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« Reply #3 on: July 26, 2013, 09:09:35 AM »

Just go to your favorite auto parts store and tell them you need one for a 1973 Camaro 350 2BBL.

Ed
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JohnZ
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« Reply #4 on: July 26, 2013, 09:24:05 AM »

You want a VAC stamped "B28" - Autozone has them, their #DV1810. Only one company makes ALL the vacuum advance units (Standard Motor Products), and they're re-boxed and sold by six or seven wholesalers, each of which assigns their own number on the box (but all of them have "B28" stamped on the part). I posted all the part numbers for the "B28" unit a month or two ago.
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« Reply #5 on: July 26, 2013, 09:43:08 AM »

Isn't the B28 the same one as for the Z28?    Does the 396/375hp  engine use the same vacuum advance part?
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Gary W.  /  69Z28-RS, 72 B 720 cowl console rosewood all tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe (2), 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55 Nomad, '57 Nomad, '57 B/A Sedan
Ed Bertrand
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« Reply #6 on: July 26, 2013, 10:11:03 AM »

Quote
Isn't the B28 the same one as for the Z28?    Does the 396/375hp  engine use the same vacuum advance part?

From the factory, no, but this is the only vacuum advance that starts moving at 4" hg and is completely done at 8" hg.

Ed
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Rick68
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« Reply #7 on: July 26, 2013, 09:34:17 PM »

I once again talked to the auto suppliers that are shop deals with(independent auto supplier,UAP/NAPA,Car Quest and Parts Source)and they all said the same thing.All the part numbers listed in the forum are discontinued or obsolete.I even tried the the application :1973 Camaro 350 2 bbl and they said it too was discontinued/obsolete.I also told them to look up Standard Motor Products/Blue Streak and guess what?Discontinued  or obsolete.Now I know you said that Autozone can get them but here in Canada we do not have Autozone stores.That is why I was looking at the vacuum advances from Paragon Corvette.
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Ed Bertrand
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« Reply #8 on: July 26, 2013, 09:48:16 PM »

Go to ROCKAUTO and put in 1973 Camaro. Select Ignition then Distributor Vacuum Advance. They don't have the one that starts at 4" and completely done at 8", but they do have P/N VC181 which starts at 5" and is all in at 7".

Ed
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Rick68
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« Reply #9 on: July 26, 2013, 10:26:10 PM »

Thanks Ed.I will try ordering  that part number from the suppliers that I deal with.
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Rick68
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« Reply #10 on: July 30, 2013, 10:11:21 PM »

I had the vacuum advance P/N VC181 come in and it is the wrong one.It starts at 7" and ends at 13" so it will not work on my car.It is also stamped B26.I was already to order it from one of the Corvette suppliers and pay 45.00 but decided to check the internet one more time.And I lucked out.AIRTEX manufactures vacuum advances and they have the one I need.The p/n is 4V1053.There are lots on ebay and amazon.Also ROCKAUTO has them but it is not listed under 1973 Camaro 2bbl.Instead use 1973 Caprice 2bbl and it will come up.And beside the listing it shows the Autozone p/n DV1810 as well as GM p/n 88924985 and 1973469 as a cross reference.
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JohnZ
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« Reply #11 on: July 31, 2013, 09:55:23 AM »

I posted these part numbers for the "B28" vacuum advance unit before, but I can't locate the post; ALL vacuum advance units are manufactured exclusively by Standard Motor Products, who sells them to branding wholesalers who re-box them with their own part numbers (but ALL are stamped by SMP with "B"-codes, which define their characteristics).

"B28" Vacuum Advance Units (start at 4" Hg., finish at 8" Hg.):

GM #88924985
AC-Delco #D1312C
Airtex #4V1053
BWD #V329
Standard #VC-177
Wells #DV1810
Niehoff #DR-305
Car Quest #57-7537
NAPA/Echlin #VC-1810
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Steve68
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« Reply #12 on: July 31, 2013, 10:11:47 AM »

You posted them here John....http://www.camaros.org/forum/index.php?topic=4045.msg26331#msg26331

Steve
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zman1969
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« Reply #13 on: August 02, 2013, 10:49:11 AM »

I posted these part numbers for the "B28" vacuum advance unit before, but I can't locate the post; ALL vacuum advance units are manufactured exclusively by Standard Motor Products, who sells them to branding wholesalers who re-box them with their own part numbers (but ALL are stamped by SMP with "B"-codes, which define their characteristics).

"B28" Vacuum Advance Units (start at 4" Hg., finish at 8" Hg.):

GM #88924985
AC-Delco #D1312C
Airtex #4V1053
BWD #V329
Standard #VC-177
Wells #DV1810
Niehoff #DR-305
Car Quest #57-7537
NAPA/Echlin #VC-1810
John I have searched and searched for those list of numbers you have compiled but they all lead to dead ends -Discontinued probably very few being sold these days so...see my replies listed in thread above,  the Carquest was all I could fine and was - get them while you can! I now have 2 B28 spares
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Rich

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JohnZ
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« Reply #14 on: August 02, 2013, 12:35:40 PM »

John I have searched and searched for those list of numbers you have compiled but they all lead to dead ends -Discontinued probably very few being sold these days so...see my replies listed in thread above,  the Carquest was all I could fine and was - get them while you can! I now have 2 B28 spares

Have you tried RockAuto.com and GMPartsDirect.com? That's where I've been buying them.
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