1970 GT350 distributor

[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?

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.

That has been my thinking as well looking at pics and such over the years on 69 and 70 Shelbys and of course seeing them in person.

[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.

That has been my thinking as well looking at pics and such over the years on 69 and 70 Shelbys and of course seeing them in person.

You indicate that you think the 1969 4spds are dual advance in your previous post. This contradicts what you just posted  responding to my post explaining only the 70 models had the duel advance mod. It is a little confusing. Maybe you misspoke?

[Coralsnake]

Not at all. Someone decided to suggest all 1970 big blocks were "all" dual advance. They are not...

I'm not sure how that got mixed in with the small block discussion ?

[Coralsnake]

Just to further clarify (since our discussion has expanded) , I believe this is correct:

1969 GT350 4spd  used a single vacuum advance
1969 GT350 Automatic  used a single vacuum advance

1970 GT350 4spd  used a dual vacuum advance
1970 GT350 Automatic  used a dual vacuum advance

1969 GT500 4spd  used a dual vacuum advance
1969 GT500 Automatic  used a single vacuum advance

1970 GT500 4spd  used a dual vacuum advance
1970 GT500 Automatic  used a single vacuum advance

I hope Mr Gaines can proof read that.  The big block information seems to be inline with the Cobra Jet forum information and Shelby did not change big block distributors to the best of my knowledge.

[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?

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.

That has been my thinking as well looking at pics and such over the years on 69 and 70 Shelbys and of course seeing them in person.

You indicate that you think the 1969 4spds are dual advance in your previous post. This contradicts what you just posted  responding to my post explaining only the 70 models had the duel advance mod. It is a little confusing. Maybe you misspoke?

I don't think so. Go read my post as I was answering another persons thoughts. My assumptions have always been single advances on 351Ws and that goes into  non Shelbys also. I'm also open to new info if it proves Fords shop manuals incorrect or not updated so to speak. Read my reply #12

[shelbymann1970]

Just to further clarify (since our discussion has expanded) , I believe this is correct:

1969 GT350 4spd  used a single vacuum advance
1969 GT350 Automatic  used a single vacuum advance

1970 GT350 4spd  used a dual vacuum advance
1970 GT350 Automatic  used a dual vacuum advance

1969 GT500 4spd  used a dual vacuum advance
1969 GT500 Automatic  used a single vacuum advance

1970 GT500 4spd  used a dual vacuum advance
1970 GT500 Automatic  used a single vacuum advance

I hope Mr Gaines can proof read that.  The big block information seems to be inline with the Cobra Jet forum information and Shelby did not change big block distributors to the best of my knowledge.

That has been my thoughts for years but never really discussed in Detail. Ed's response on 70 Gt500  dist were mentioned before on another topic. Makes sense the GT500 would be the same as 428 70 CJ in 70 for emissions and that info is on the CJ website.

[shelbymann1970]

Reply #15: 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.
My response: That has been my thinking as well looking at pics and such over the years on 69 and 70 Shelbys and of course seeing them in person.
So if that is a misspeak then I misspoke. So my assumption from what i have seen all 69 351Ws single advance even on Shelbys. 1970 GT350s dual advance on 4 speeds-not sure on automatics but think they should be single?  I hope this clarifies things?

[Coralsnake]

Thank you Mr Gaines I will see what I can find there

[shelbymann1970]

NVSAAC site it is hard to see sometimes as the pics are old and not every car is original. Found a few 70 cars with single advances on them.  #2297 had a single, #2372 is a single with a 4 speed air but don't know the factory arrangement as to the originality of the trans or the engine bay which looks like incorrect parts like the air cleaner. To be clear I don't think the 70s(too few) there give me any indication what could be factory correct.
What's up with the hose coming off the cleaner on the pass side?  I wonder what it actually goes to...
https://www.nvsaac.com/photogallery/images/1970/350/70_350_2372_e.jpg

[Special Ed]

Thats for california fuel evap system.  I seen that setup while in california mustang shops years ago as it was a law had to be added to 70 shelbys sold in california.

[shelbymann1970]

Thats for california fuel evap system.  I seen that setup while in california mustang shops years ago as it was a law had to be added to 70 shelbys sold in california.

So #2372 would have been sold new in California with the air cleaner like that?

[crossboss]

Thats for california fuel evap system.  I seen that setup while in california mustang shops years ago as it was a law had to be added to 70 shelbys sold in california.

So #2372 would have been sold new in California with the air cleaner like that?

All 1970 Shelbys (and Mustangs) sold in California did receive the extra emission requirements per federal and state law. Evap tanks, special gas filler tubes/special gas caps, fuel lines, charcoal canisters, revamped distributors, air cleaners, and carb chokes  (I believe only) on GT-500 models. My GT-500, 0F02R483129 was bought and sold in California, and I bought it in 1984 from the original owners. All of this stuff was intact and functioning.

[Coralsnake]

I apologize for the poor quality of this picture, but the California Evaporative Emissions System was added to about 80 cars, both GT350 and GT500 models.

The drawing shows all the modifications including the addition of evap tanks, special gas filler tubes/special gas caps, fuel lines, charcoal canisters, air cleaners and even the antennas.

So far I have not seen any Shelby or Ford documentation to indicate the GT500 distributors were changed in any way. The air cleaner is shown in the lower left.

[shelbymann1970]

Thanks for the drawing Pete. That hose on a 69 air cleaner baffled me.

[J_Speegle]

Thanks for the drawing Pete. That hose on a 69 air cleaner baffled me.

The hose that goes to the canister and then the smaller one that returns to the tank?