Distributor Vacuum Advance Part #

[Wayne M.]

Re: Distributor Vacuum Advance Part #

Jim, That's a very rare vacuum advance you have. One time I pulled one of those from a 65 FI distributor. But bubba put it there as those are typically the 236"s. JD

Bidding will begin at $1000. (just kidding ). Its value is whatever a B-code NAPA goes for UNTIL / IF the '65 TIM&JG recognizes it for the '076' distribs.

Got this off eBay about 5 years ago. Seller correctly identified it as a '238' in spite of the box # 1116168. In fact, after following this discussion, I'm wondering if the owner was having the problems discussed above, and elected to change to a '168'. This can looks almost new, but there are screw marks of it having been installed at one time. Also, the little rubber sleeve is hurting.

[Joe L.]

Re: Distributor Vacuum Advance Part #

Bidding will begin at $1000. (just kidding ). Its value is whatever a B-code NAPA goes for UNTIL / IF the '65 TIM&JG recognizes it for the '076' distribs.

Got this off eBay about 5 years ago. Seller correctly identified it as a '238' in spite of the box # 1116168. In fact, after following this discussion, I'm wondering if the owner was having the problems discussed above, and elected to change to a '168'. This can looks almost new, but there are screw marks of it having been installed at one time. Also, the little rubber sleeve is hurting.

Wayne------


I think this vacuum control was "well used". I just don't see any other way the bushing could have gotten to the condition it's in. Just sitting in a box, even for a lot of years, would not result in this.

The GM #1116168 had no original Corvette applications. It was used on some 1965 327 cid non-Corvette applications as well as 1962-65 Cadillac and some late 50's Oldsmobiles.

[Duke W.]

Re: Distributor Vacuum Advance Part #

The 1965 250/300 HP spark advance map is a one year odd ball. (It's been discussed here several times.) Why? Probably because it doesn't work very well.

For 1966 and '67 the VAC was 16 @ 12", and it worked fine with both PG and manuals.

So if you want it your engine to run better, install a "B20" VAC, which meets the above spec. The "B22" you have is best for a 300 HP with manual, but PG doesn't pull as much idle vacuum and needs a 12" VAC - just like the engineers figured out 45 years ago.

Duke

[David L.]

Re: Distributor Vacuum Advance Part #

The GM #1116168 had no original Corvette applications. It was used on some 1965 327 cid non-Corvette applications as well as 1962-65 Cadillac and some late 50's Oldsmobiles.

Joe,

While researching vacuum controls I came across this thread about 65 Corvette vacuum controls.

My 1965 Chev. Parts Catalog (Oct. 1964) lists GM # 1116168 as the vacuum control for the 65 Corvette w/1111076 distributor. The 1116168 vacuum control is stamped "S 168 22". The 65 Corvette AMA Specifications (page 11, dated 9/28/65) indicates the Max. deg. in Hg. as 22 @ 12 which checks out with the 1116168 vacuum control.

My 1965 Chev. Parts Catalogs (Jan. & May 1965) lists the 1116238 vacuum control (stamped "MS 238 24") for the 1965 Corvette w/1111076 distributor. It appears to me that there was a change made sometime in the Fall of 1964.

Based on this I tend to believe that the 1116168 vacuum control did have a Corvette application - "early" 1965 Corvettes w/1111076 distributor.

Dave

[Duke W.]

Re: Distributor Vacuum Advance Part #

I would think that if a running change was made to the distributor - like a different VAC - the dist. number would change, but maybe not. Or perhaps the 168 is an error in the parts book.

In any event, the 168 and 238 specs are within production tolerance of each other.

Maybe Joe can run the 168 through his history calculator and see if it was superseded by the 238

Duke

[David L.]

Re: Distributor Vacuum Advance Part #

According to my Jan. 1965 to July 1973 Chevrolet Parts History catalog GM # 1116168 does not appear at all which is really quite unusual. It also does not appear in the Parts History Index in my 1965 Chev. Parts Catalog (Jan. 1965) which covers part number changes from
Jan. 1963 to Jan. 1965.

Dave

[William C.]

Re: Distributor Vacuum Advance Part #

Doesn't show in any of the Delco remy listings for Corvette distributors in that era either.

[Joe L.]

Re: Distributor Vacuum Advance Part #

I would think that if a running change was made to the distributor - like a different VAC - the dist. number would change, but maybe not. Or perhaps the 168 is an error in the parts book.

In any event, the 168 and 238 specs are within production tolerance of each other.

Maybe Joe can run the 168 through his history calculator and see if it was superseded by the 238

Duke

Duke-----


It's a curious thing. The GM #1116168 is cataloged in the October, 1964 edition of the P&A Catalog as Dave describes. It's not cataloged in the July, 1965 edition of the catalog and the applications the 1116168 was cataloged for were then shown as serviced by the 1116238. However, and this is the curious part, no discontinuation or supercession of the 1116186 is shown for that period or for any subsequent period. This implies some sort of error with the 1116168 being cataloged in the first place. It might have been a PRODUCTION-only part that was mistakenly cataloged for SERVICE.

[Page C.]

Re: Distributor Vacuum Advance Part #

Did find 1116168 vac control listed for all 1959-1963 Olds and 1964 Olds except F85 and J88. It was used to superceed the vac control 1116144 April 1, 1961. Also shows up in some of the Delco specs. for these model Olds. It was in the Olds parts book into May of 1980. Then the trail ran cold.

[Joe L.]

Re: Distributor Vacuum Advance Part #

Did find 1116168 vac control listed for all 1959-1963 Olds and 1964 Olds except F85 and J88. It was use to superceed the vac control 1116144 April 1, 1961. Also shows up in some of the Delco specs. for these model Olds. It was in the Olds parts book into May of 1980. Then the trail ran cold.

Page-----


That helps. The 1116168 was cataloged for Oldsmobile and Cadillac applications, although I don't know what they were. It was never cataloged for Chevrolet applications except for the probable error previously discussed. That's also why it was not shown as discontinued (because it was not discontinued0. It was just inadvertently shown in the Chevrolet P&A Catalog for a very short period of time (even though it may have actually been used in PRODUCTION for a limited number of Chevrolet distributors). While not carried as a Chevrolet part, if one knew the part number, the 1116168 could have been ordered through GMSPO. At least, it could have been until March, 1995. At that time it was discontinued without supercession.