CRG Discussion Forum

Camaro Research Group Discussion => Originality => Topic started by: manyc on January 17, 2020, 05:00:38 PM

Title: Correct Vac Advance unit - 67 SS350 Manual Trans
Post by: manyc on January 17, 2020, 05:00:38 PM

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

Title: Re: Correct Vac Advance unit - 67 SS350 Manual Trans
Post by: Mike S on January 17, 2020, 05:07:36 PM

 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

Title: Re: Correct Vac Advance unit - 67 SS350 Manual Trans
Post by: bertfam on January 17, 2020, 05:13:11 PM

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 (https://www.rockauto.com/) 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
 

Title: Re: Correct Vac Advance unit - 67 SS350 Manual Trans
Post by: manyc on January 18, 2020, 04:00:07 PM

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

Title: Re: Correct Vac Advance unit - 67 SS350 Manual Trans
Post by: KurtS on January 19, 2020, 04:42:09 AM

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

Title: Re: Correct Vac Advance unit - 67 SS350 Manual Trans
Post by: manyc on January 20, 2020, 12:12:26 AM

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.