Dual point dwell

[hertzz350]

How many people still run dual points on their shelbys? How many run petronix? #689 still runs points.

[JD]

How many people still run dual points on their shelbys? How many run petronix? #689 still runs points.

Neither, I ran MSD with the small black distributor cap and black wires, painted the MSD coil black and the top of the coil off-yellow.  Painted the box black and mounted it under the battery tray.

[vtgt500]

I have always set Ford dual point dwell as, 27 deg each, with 34 deg combined.
For an OEM "look" with much improvement, now use an All-In-One vacuum advance distributor.  Summit, Jegs, and MSD all sell the same product.

[Brandon]

Hope this helps, page 60 of a 1967 Shelby GT350/500 Owners Manual...

That's exactly why I started this thread.  It says 22-24 degrees (428) (combined @ idle)(both).

[TLea]

Interesting.  Any idea why it refers to 22-24 rather than 30-33 in the manual?  The original was obviously not transistorized, and it doesn't make any reference to it.  Where did you get 30-33 from?

The transistorized refers to the R code Galaxies which used same distributor
Where did I get 30-33 from? Working on Ford dual points since I was 13 

But this is a 1967 Shelby GT350/GT500 Owners Manual, which wasn't transistorized. I'm not challenging your assertion because 22-24 seemed low to me, but surprised they'd have this big of a misprint.

Only thing I can think of other than being a misprint is thats individual point dwell not combined but then why don't they do the same for the 289 version? I'm not great at posting pics so I sent pic of 65 Ford shop manual specs to another member to post. It shows both the transistorized and conventional

[JD]

Tim asked me to post this image and his comment...

"I'm not very good at posting pictures, but this should answer his questions. Since there's no factory service manual for a 67 GT500, you can refer to the 65 Ford, which uses the same distributor in the 427.
I don't know why it says 20 to 24 in the Shelby owners manual, maybe it's talking individual Point dwell and not combined"

[J_Speegle]

The answer to ALL your issues is called petronix.

It's all underneath the cap, no one will ever know.

Set it and forget it.

Make sure you get ALL matched components

Forgot the AAA card for the tow truck 

[FL SAAC]

The answer to ALL your issues is called petronix.

It's all underneath the cap, no one will ever know.

Set it and forget it.

Make sure you get ALL matched components

Forgot the AAA card for the tow truck

Why in heavens name would you say that?

We have run petronix in the same car, same unit for 25 years.

No issues what so ever.

It's a great product

[J_Speegle]

Why in heavens name would you say that?

Just opposite experience on multiple cars. Its often suggested, if your mechanically incline, to have a set of points and parts with the car just in case you do run them. Will leave it at that since this thread has a different purpose and focus   

[Brandon]

Will leave it at that since this thread has a different purpose and focus   

Well on that note, since you're one of the concours experts Jeff, any idea why the original owners manual seems to have incorrect dwell values? 

[FL SAAC]

Why in heavens name would you say that?

Just opposite experience on multiple cars. Its often suggested, if your mechanically incline, to have a set of points and parts with the car just in case you do run them. Will leave it at that since this thread has a different purpose and focus  

Gotcha you have had bad luck.

We have carried a spare petronix in our trunk for years because of these rumors.

Never ever have had to use it on our multiple cars.

On another note we also carry a spare tire, again have never had to use it either.

[TA Coupe]

The answer to ALL your issues is called petronix.

It's all underneath the cap, no one will ever know.

Set it and forget it.

Make sure you get ALL matched components

Forgot the AAA card for the tow truck

Why in heavens name would you say that?

We have run petronix in the same car, same unit for 25 years.

No issues what so ever.

It's a great product

Maybe because you are running a "petronix" and Jeff is talking about "Pertronix" 😄

      Roy

[FL SAAC]

[quote ]
Maybe because you are running a "petronix" and Jeff is talking about "Pertronix" 😄

      Roy
[/quote]

Roy you "Rhodes Scholar" you....

I ask you..."Tomatoes or Tomatos"

Let's get back on topic on this dwelling question, does anyone really know the dual point dwell?

[Brandon]

Alright, with my primary point gap at .017" and secondary at .015", I get a dwell of 31-32, which I'll call good. With them both at .017", I was just below 30.  Not sure why the gap is so small to hit that dwell since Tim/JD confirmed the gaps should be .019" to .021".

[SFM6S]

6S1766 is running points.

Joe