Correct Vac Advance unit - 67 SS350 Manual Trans

[manyc]

I finally got my hands on the correct date coded 1111168 distributor for my 67 RS/SS 350 Conv 4spd manual trans convertible project.  The vacuum advance is no good (horribly rusted).  It is an MS400-15 stamped unit, which I believe is correct for my application based on forum searches. I am having trouble trying to locate a functional replacement for it.  I don't even know the original  GM part number for it. Forum searches don't seam to yield enough info.  Any hep would be appreciated.
thanks
Chris

[Mike S]

 Here is one on eBay:
https://www.ebay.com/itm/NOS-Sealed-Delco-Remy-1968861-Vacuum-Advance-1967-68-Camaro-302-327-350-SS-Z28/264598959515?hash=item3d9b53b59b:g:2gMAAOSwe5peHiPQ
It's pricey but sometimes one has to bite the bullet (I know I have several times for hard to find parts).

Mike

[bertfam]

Yes, the Chevrolet factory part number was 1968861 (Delco part number D1354A), but if you want better mileage, performance and a cooler running engine, get an aftermarket B28 canister. They come in various part numbers (basic list below), but go to ROCKAUTO and put in 1973 Camaro 350. Select Ignition then Distributor Vacuum Advance. They don't have the one that starts at 4" and completely done at 8", but they do have P/N VC181 which starts at 5" and is all in at 7".

GM #88924985
AC-Delco #D1312C
Airtex #4V1053
BWD #V329
Standard #VC-177
Wells #DV1810
Niehoff #DR-305
Car Quest #57-7537
NAPA/Echlin #VC-1810

Ed

[manyc]

Wow $275!  I think I will not bite that bullet.

I think I need to understand this a little better. RockAuto lists a B26 for a 1967 350/295 , which starts 5-7 and all in at 11-13. B28 is 3-5 start and all in at 5.75-8. They are both 8 degree dist degree advance. What are the specs for a MC400-15? Isn't the "15" mean degrees of advance ?  I have the Lars Grimsrud article and this graph I found on this site.  I guess if I knew the start, stop and advance degree ratings for the 1968861 I can at least  understand why B28 is the better choice.

thanks for your help
Chris

[KurtS]

You've looked at JohnZ's article? http://www.camaros.org/pdf/timing101.pdf

[manyc]

I have the article, but it help if I knew what my car's advance specs are originally supposed to be. 67 SS350 are not listed.