1970 GT350 distributor

[shelbymann1970]

Car is a GT350 4 speed no air car. Here are some pics of my original dist. Stamped ED 0AF  "H". Date  9F24  Vacuum advance is a "A12"

[Coralsnake]

Thanks Gary

I think thats D0AF-H and it is correct!

[SCJSTU]

What's your cars build date?

[crossboss]

All 1970 Shelby's, especially California cars like my ex car 0F02R483129, had the same dual canister vac/retard device on it. Remember, 1970 was a year when emissions (esp CA cars!) where new, tougher laws went into effect. As for your correct part number, I do not know...the experts will chime in on that one.

[Coralsnake]

I believe the 1970 428CJ cars with an automatic transmission used the single vacuum advance.

[shelbymann1970]

All 1970 Shelby's, especially California cars like my ex car 0F02R483129, had the same dual canister vac/retard device on it. Remember, 1970 was a year when emissions (esp CA cars!) where new, tougher laws went into effect. As for your correct part number, I do not know...the experts will chime in on that one.

I never call myself an expert on anything but I'll go out on a limb and say this is my original dist. I posted this because there really has never been an in-depth discussion on the 70 GT350 dist. that I'm aware of. When Pete asked about an air 4 speed 69 I thought it was time to discuss the 70s. Changed due to emissions. Ed Meyer told me a long long time ago if you had ED stamped on it it was probably original. Hence the "ED" in my pic but the "E" is backwards.  "The D0AF" the "D" could be  missing but the "0" is very lightly stamped so it is possible the "D" is there but doesn't show up in the flash. Thinking back when it was out of the car I'm pretty sure the D is there. 
The "A12" I have no reason to think it isn't the original vacuum advance. In 1969 all 351Ws got a single advance whether a manual or automatic according to the shop manuals and vacuum schematics for 1969. No 351W 4V in 70 so nothing in the shop manuals for 70 would pertain to this setup.

[shelbymann1970]

What's your cars build date?

Before the distributor. May 6, 1969.

[Coralsnake]

In 1969 all 351Ws got a single advance whether a manual or automatic according to the shop manuals and vacuum schematics for 1969.

I believe thats correct, but still looking for additional information

[crossboss]

I believe the 1970 428CJ cars with an automatic transmission used the single vacuum advance.

No. My California GT-500 had the dual vac/retard advance canister.

[Coralsnake]

Ok thats one car what about all the other ones?

You should probably let the Cobra Jet forum know too, they have different opinions

[shelbymann1970]

Ok thats one car what about all the other ones?

You should probably let the Cobra Jet forum know too, they have different opinions

One of my friends has a 70 GT500 4 speed vert. Car was restored many decades ago with added things like a white interior, air cond, oil cooler,  stereo etc. So not an original car but will try and see what dist he has in it and the advance. I knew of another very original all intact never restored 4 speed 70 GT500(highest serial numbered GT500 vert) but painted white(1 of 2 pastel gray) in 1975 for his prom and still the same last time I saw it many years ago.

[Coralsnake]

Gary

I think the 1969 4spds are dual advance. The automatic trans are single vacuum advance just like 1968. They did not change the 1970 big block distributors. Therefore not all 1970s are not dual advance.

[shelbymann1970]

Gary

I think the 1969 4spds are dual advance. The automatic trans are single vacuum advance just like 1968. They did not change the 1970 big block distributors. Therefore not all 1970s are not dual advance.

I always went off of the 1969 shop manuals and the vacuum advance hose diagrams are only for a single advance. The vacuum tree I believe was used  only on air cond cars? Do you think at AO Smith they modified the dist putting on a dual advance when the intake was done?
  It appears every 69 Mustang with a 351W 4 speed I find also has the single vacuum advance.
Have you gone through this pic gallery on this site. I have over the years. Of course we don't know how original these cars are.  https://www.nvsaac.com/gallery/1969_GT350_main.htm

[Special Ed]

The 70 gt 500s had manual choke ED stamped tag carbs  and choke cable added done at kk plant and distributors changed out all part new 70 emissions laws 4-speeds dozf-c dual point dual advances and auto dozf-g single point with regular auto advances. 70 gt 350s had ED distributors also. Ford had 351w engines yet in  very early 70 model cars till clevelands were used.

[Bob Gaines]

Gary

I think the 1969 4spds are dual advance. The automatic trans are single vacuum advance just like 1968. They did not change the 1970 big block distributors. Therefore not all 1970s are not dual advance.

I always went off of the 1969 shop manuals and the vacuum advance hose diagrams are only for a single advance. The vacuum tree I believe was used  only on air cond cars? Do you think at AO Smith they modified the dist putting on a dual advance when the intake was done?

The only distributors that needed to be modified were the 1970 models so they could comply with 70 emission standards. There was no reason to modify the 69 4 speed distributor from what came on the regular Mustang 351 W 4 speed.  The mods were done at Kar Kraft not AO Smith just like they did on the GT500.