Topic: Vacuum Advance Screw Finish

[rockhouse66]

I found a very informative thread about distributor finish and reply #9 refers to the vacuum advance screw finish changing from "early" to "late" with illustrations.  However, there are no dates to indicate when this change took place.  Can someone pin this down for me please?

Here is the previous thread;
http://www.concoursmustang.com/forum/index.php?topic=13109.msg80274#msg80274

[jwc66k]

What year, what engine, what - a whole bunch of other questions.
Jim
(My 66 GT K Fastback has no vacuum stuff, but my 66 289 4V does, as does my 65 GT Fastback.)

[rockhouse66]

Jim

Well, that's my question.  What date or model year did the advance screw finish change from zinc to P&O?  I don't think you are suggesting you know but it is engine code specific?

If it does matter, I am primarily interested in FE engine applications.  So it would be '67 - '70 Mustang big block.

[J_Speegle]

Don't know if we've focused on that yet. Guess now is the time.

I'll look through my new dist pictures as well as unrestored cars and I'm sure others will provide what they can for you and the site

[jwc66k]

I found a very informative thread about distributor finish and reply #9 refers to the vacuum advance screw finish changing from "early" to "late" with illustrations.  However, there are no dates to indicate when this change took place. 

Are you referring to the two screws that hold the vacuum advance diaphragm to the distributor housing?
Jim

[rockhouse66]

Are you referring to the two screws that hold the vacuum advance diaphragm to the distributor housing?
Jim

Yes, those two screws.  In the link I included, Jeff posted pictures with both finishes used and he called them early and late but I don't know the changeover date.