Topic: 68 390 Dual Vacuum Distributor Questions

[duffman]

Im on the hunt for a dual vac unit for my 68 390 4speed, and a couple of questions.
1. I read there was 2 versions, one for matics, and 1 for 4speed.  Whats the difference?
2. There are a ton out there on  ebay, mostly 3rd party that looks close, yet all are missing the nut.   Anything to be wary of?
3. Where would I find the nut?

Thanks in advance. love this forum!

[jwc66k]

Im on the hunt for a dual vac unit for my 68 390 4speed, and a couple of questions.
1. I read there was 2 versions, one for matics, and 1 for 4speed. 

Did you look in the library?

Whats the difference?

Probably the springs and weights.

2. There are a ton out there on  ebay, mostly 3rd party that looks close, yet all are missing the nut.   Anything to be wary of?
3. Where would I find the nut?

Define "nut".
Jim

[J_Speegle]

.Define "nut".

Think he may be referring to the zinc dicromate spring retainer at the end of the housing

[rockhouse66]

Think he may be referring to the zinc dicromate spring retainer at the end of the housing

If so, readily available from AMK.

[RoyceP]

If it's for the dual advance unit it is a "Plug" AMK P/N F-1627. You would still need the other parts that go between the plug and the vacuum advance.

[jwc66k]

Kind of like an oil pan drain plug.
Jim