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Adjustable Vacuum Canistor for 300 4.9L

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old28racer
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Adjustable Vacuum Canistor for 300 4.9L

Post #1 by old28racer » Sat Nov 16, 2019 11:57 am

I have a P&C Dizzy in my 1971 F250 300 4.9L motor and I just picked up a spare P&C dizzy from a 1974 F100 van. Both of the existing units have non adjustable vacuum canisters on them. I am going to rebuild the 1974 dizzy with a Pertronix 1261 Ignitor and want to install an adjustable vacuum canister on the unit.

Does anyone know if Motorcraft has this unit & what is the ID number? If not are there other units that will work?
Bad Day Racing Is Better Than A Day In The Stands :mrgreen:

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Re: Adjustable Vacuum Canistor for 300 4.9L

Post #2 by bubba22349 » Sat Nov 16, 2019 4:29 pm

Hi old28racer, the "Standard Motor Products VC31T" is an adjustable Vacuum advance canister with the early style 1967 68, etc. single vaccum tube hook up. I think the Autolite / Motorcraft number is C70F-A,B, C72FZF-F.

If you want the Duel Vaccum hook up (for the stock Ignition Retard feature Caif. Smog spec's) the Standard number is VC192 I variafyed that its ajustable, Autolite / Motorcraft number again I think is C9UF-E, DOTF-F, M. Or if you prefer you can use those Standard Motor Products numbers to try and cross-reference it into a Motorcraft or NAPA vaccum advance canister number. Good luck :thumbup: :nod:
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

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old28racer
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Re: Adjustable Vacuum Canistor for 300 4.9L

Post #3 by old28racer » Sat Nov 16, 2019 6:28 pm

bubba22349 -- Thanks for the numbers. A single vacuum connection is fine as this is for a 1971 that is CA exempt. I would like a motorcraft unit if I can as I have had good luck with my local Ford dealer being able to order from the motorcraft warehouse. Never used "standard motor products", are they good quality.
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Re: Adjustable Vacuum Canistor for 300 4.9L

Post #4 by old28racer » Sat Nov 16, 2019 6:44 pm

Just looked up a "standard Motor Product" # VC31T single vacuum canister on Summit web site and they say it is a "non adjustable" unit. I am looking for an "adjustable single canister".
Bad Day Racing Is Better Than A Day In The Stands :mrgreen:

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Re: Adjustable Vacuum Canistor for 300 4.9L

Post #5 by wallen7 » Sat Nov 16, 2019 7:34 pm

Most of the single vacuum advances in the late 70's early 80's had a adjustment feature. If you go thru the vacuum tube connector with a 1/8 Allen wrench you will find it. Clockwise to tighten spring and counterclockwise to loosen. Or clockwise for less advance and counter clockwise for more advance.

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Re: Adjustable Vacuum Canistor for 300 4.9L

Post #6 by old28racer » Sat Nov 16, 2019 9:33 pm

wallen7 -- I know the one on my truck is not adjustable as it is a dual original CA truck that had smog stuff when it was new, it's a 1971 that is smog exempt now (pre 1975). the spare unit was from a E100 240 Van out of Kanas that has a single port. I will check & see if it is an adjustable unit.
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Re: Adjustable Vacuum Canistor for 300 4.9L

Post #7 by bubba22349 » Sat Nov 16, 2019 11:15 pm

old28racer wrote:Just looked up a "standard Motor Product" # VC31T single vacuum canister on Summit web site and they say it is a "non adjustable" unit. I am looking for an "adjustable single canister".


Yes old28racer the Standard Motor Products was a good quality line of ignistion parts at one time I used their parts exclusively during the mid 1950's and into the mid 1960's along with Champion Plugs. I then switched over to Autolite plugs and ignistion parts for their Better quality and longer lasting spark plugs. I had hoped that number might lead you to a Motorcraft or NAPA number, i also mostly use the NAPA or Motorcraft parts for many years now. I guess there is conflicting info on that number though, when a looked it up on the one site said it was adjustable, but yes Standard Motor Products themselves say it's not ajustable on the Summit site, sorry about that. :nod:
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

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Re: Adjustable Vacuum Canistor for 300 4.9L

Post #8 by wallen7 » Sun Nov 17, 2019 7:06 pm

Alternate/OEM Part Number(s): D2AF12370GA, D2AZ12370C, D2AZ12370G, D2UZ12370C, D3OZ12370C, DD359 2 vacuum connectors

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Re: Adjustable Vacuum Canistor for 300 4.9L

Post #9 by wallen7 » Sun Nov 17, 2019 7:09 pm

Alternate/OEM Part Number(s): 12336816, C5AZ12370A, DD190, F1314 1 vacuum connector

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Re: Adjustable Vacuum Canistor for 300 4.9L

Post #10 by wallen7 » Sun Nov 17, 2019 7:11 pm

Alternate/OEM Part Number(s): D5AE12370AA, D5AZ12370A, D5DE12370AA, D5DZ12370A, D5OE12370AA, D7TE12370CA, D7TZ12370B, DD364, DD714, DD724, DD735, DD746, DD762, DD780
This is listed for a 78 model

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Re: Adjustable Vacuum Canistor for 300 4.9L

Post #11 by old28racer » Mon Nov 18, 2019 9:19 pm

I checked the vacuum unit on the 240 distributor that was in a 1974 E100 van, it is a single connection but it is not adjustable.
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Re: Adjustable Vacuum Canistor for 300 4.9L

Post #12 by wsa111 » Mon Nov 18, 2019 9:39 pm

Regardless of what brand you choose, the vacuum part is adjustable, but the mechanical total is not. Better check your mechanical total on the vacuum advance.
With my Sun Tester its easy.
If you have a dial back timing light you can check it.
Another way is with a scale ruler measure the travel of the lever.
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Re: Adjustable Vacuum Canistor for 300 4.9L

Post #13 by old28racer » Tue Nov 19, 2019 12:33 am

All vacuum advance canisters are not adjustable, mechanical advance is adjustable with springs & weight changes. My current dizzy is curved so I get 34* @ 2250 rpm. My current non adjustable vacuum advance will push total advance above 48* at 5600 rpm.
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Re: Adjustable Vacuum Canistor for 300 4.9L

Post #14 by old28racer » Mon Dec 02, 2019 10:14 pm

I contacted Ignition Engineering in Southern CA about an adjustable distributor vacuum advance canister for a 240/300 Ford inline 6. They said non are made for a Ford 6 inline 240/300. Does anyone on this site know who I might contact to find one. Lots of single input nipple units but they are all non adjustable.
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Re: Adjustable Vacuum Canistor for 300 4.9L

Post #15 by mtbikerTi » Tue Dec 03, 2019 12:08 pm

Looking through parts catalogs it appears that the 4.9/300 advance canisters are interchangeable with the 5.0/5.8/302/351 canisters. I don't have both distributors here to physically verify that, but if that's correct then look at Crane Cams part #99607-1

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Re: Adjustable Vacuum Canistor for 300 4.9L

Post #16 by guhfluh » Tue Dec 03, 2019 4:48 pm

Mine came on my refurbished distributor I purchased through O'Reilly's for a 1968 F100 300. It is internally adjustable with an allen through the vacuum tube hole.
1967 F-250 Crew Cab 2wd, 300 6cyl, T-170/RTS/TOD 4-speed overdrive
240 head, Offy C, EFI exhaust manifolds, Comp 268H, mandrel 2.5-3" exhaust, Edelbrock 500, Pertronix ignitor and coil, recurved dizzy. 200whp/300wtq

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Re: Adjustable Vacuum Canistor for 300 4.9L

Post #17 by old28racer » Tue Dec 03, 2019 7:23 pm

guhfluh -- As I am locater in CA lots of ignition parts are not found at our local parts stores because of the smog rules. Good part is my 1971 F250 300 4.9L is exempt (pre 1975). Where are you located? Can you get me a O'Reilly's Part number for an adjustable distributor vacuum advance canister like is on your 1968 F100 300? I may have to order one from out of state to get an adjustable unit. Thanks for your help, Tom.
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Re: Adjustable Vacuum Canistor for 300 4.9L

Post #18 by guhfluh » Thu Dec 05, 2019 7:19 pm

old28racer wrote:guhfluh -- As I am locater in CA lots of ignition parts are not found at our local parts stores because of the smog rules. Good part is my 1971 F250 300 4.9L is exempt (pre 1975). Where are you located? Can you get me a O'Reilly's Part number for an adjustable distributor vacuum advance canister like is on your 1968 F100 300? I may have to order one from out of state to get an adjustable unit. Thanks for your help, Tom.

30-2610 should be the part number for the distributor I used. They don't show it as available in store, I'm sure I had them order it.

It is the whole distributor for $49, not just the diaphragm.
1967 F-250 Crew Cab 2wd, 300 6cyl, T-170/RTS/TOD 4-speed overdrive
240 head, Offy C, EFI exhaust manifolds, Comp 268H, mandrel 2.5-3" exhaust, Edelbrock 500, Pertronix ignitor and coil, recurved dizzy. 200whp/300wtq

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Re: Adjustable Vacuum Canistor for 300 4.9L

Post #19 by old28racer » Fri Dec 06, 2019 11:43 am

Thanks for the additional information.
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Re: Adjustable Vacuum Canistor for 300 4.9L

Post #20 by guhfluh » Fri Dec 06, 2019 12:18 pm

I'm still not convinced that neither of your vacuum advance canisters are adjustable. Have you tried multiple sizes of Allen wrenches inside the vacuum nipple hole? Basically every canister Ford supplied was adjustable and came adjusted at the factory to each engine and emission requirements, both single and dual port. Aftermarket followed.
1967 F-250 Crew Cab 2wd, 300 6cyl, T-170/RTS/TOD 4-speed overdrive
240 head, Offy C, EFI exhaust manifolds, Comp 268H, mandrel 2.5-3" exhaust, Edelbrock 500, Pertronix ignitor and coil, recurved dizzy. 200whp/300wtq

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Re: Adjustable Vacuum Canistor for 300 4.9L

Post #21 by old28racer » Sat Dec 07, 2019 10:33 pm

guhfluh -- Well you are half right, the dual unit in my 1971 F250 is an old CA smog unit that has no adjustment. The 1974 single port unit is from KS and is adjustable. I tested it with a vacuum pump and it works fine, adjustment changes the stroke as it should. Only thing I am not sure of is that the adjustment is 7 turns (full close to full open). I have a new one on the way so I will check it when it gets to me.

My new HEI distributor has an adjustable vacuum advance that is 10 turns (full closed to open).
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