1966 distributor 1111153 vacuum control

[David L.]

When I bought my 1966 Corvette (Feb. 1966, 300 HP) back in 1979 it did not have the original engine. Over the years I have collected many dated engine parts for the car. About 1987 I bought a 1963 Corvette SWC with a 1967 Chev. 327 engine & 1969 Z28 Muncie 4-speed. The distributor in the 1963 turned to be a 1966 Corvette distributor w/"1111153 6A10" tag which was perfect for my 1966 Corvette.

My "1111153 6A10" distributor has the following stampings on the various parts:

"football" @ top of shaft stamped "208W"
cam stamped "532 CCW"
vacuum control stamped "MS 357 20" (GM # 1115357)

I have my doubts that the "MS 357 20" vacuum control is correct for the 1111153 distributor based on my research in my vintage Chevrolet parts catalogs. My 1966 Chev. Parts Catalog (Oct. 1965) does not even list the 1111153 distributor in Gr. 2.361 but it is listed in my 1967 Chev. Parts Catalog (Apr. 1967). Neither parts catalog lists a vacuum control for the 1966 Corvette w/base 327 engine. The 1115357 vacuum control is listed for the 1965 Corvette w/base 327 engine.

My Delco-Remy Service Parts Catalog (Nov. 1972) lists GM # 1115355 as the part number for the 1111153 distributor vacuum control.

Is the "MS 357 20" vacuum control correct for the 1111153 distributor?

Dave

[William C.]

Re: 1966 distributor 1111153 vacuum control

no, a correct part would be stamped 355 15

[Mike Z.]

Re: 1966 distributor 1111153 vacuum control

Per the Delco-Remy Test Specifications for 1964-1971, the #153 distributor used a #1115355 vac canister. That same canister is also correct for 65 396/425HP and 66 390HP, and I am sure other applications.
Mike

[Wayne M.]

Re: 1966 distributor 1111153 vacuum control

Per the Delco-Remy Test Specifications for 1964-1971, the #153 distributor used a #1115355 vac canister. That same canister is also correct for 65 396/425HP and 66 390HP, and I am sure other applications.
Mike

Mike -- Per the 5th ed. '65 TIM&JG, the 1116201 vacuum can was used on '65 L78's. A. Colvin shows that the 1111093 425hp distributor for '65 and '66 used (successively ?) the 201, the 355, and the 360. Maybe someone with a '66 TIM&JG can tell us what is shown as TFP for that year.

I agree with you that the Delco specs (green books -- I have '64-66; '64-68 and '64-76) all show the 355 for the 093 distrib.

[Mike Z.]

Re: 1966 distributor 1111153 vacuum control

Mike -- Per the 5th ed. '65 TIM&JG, the 1116201 vacuum can was used on '65 L78's. A. Colvin shows that the 1111093 425hp distributor for '65 and '66 used (successively ?) the 201, the 355, and the 360. Maybe someone with a '66 TIM&JG can tell us what is shown as TFP for that year.

I agree with you that the Delco specs (green books -- I have '64-66; '64-68 and '64-76) all show the 355 for the 093 distrib.

Wayne, I respect what you are saying the TIM&JG indicates, but the blueprints or other original GM documents, I believe are the final answer as to what Delco was building. To clarify: the original design date for the #093 was 9-6-64, and you and Duke are correct-it specified a #355 vac. However, a design change dated 7-?-65 calls for a #360, therefore; the 65 L-78 would have had a #355 and the 66L-72 would have been speced with a #360. At this point, I have rebuilt probably 50 or 60 original #-093 distributors and the ID dates seem to confirm what I have indicated the blueprints state. FYI: the #355 vac was used on the 66 390HP application (#141 pt. & #142 TI).

Duke's indication of the #201 being used in 64 has me baffled. I personally have never seen an original unit with a #201 prior to 67 (SB or BB), as all Corvette P/N's used a #236 (as per the spec book) for SB distributors in 64. Now, it is very likely the #201 was used as a Serv Rpl part for the #236, which was phased out of the OEM line in and replaced OEM with the #201 in SB applications. The #201 was however spec for the #258 distributor and other application starting in 67.

Quite honestly, I think we are faced with: the blueprints are what was engineer spec and the test specifications indicate the original spec and does not take into account up-dates i.e., the #093 indicates the #355, but as I have indicated I agree with for 65 only.

My sense is: if the TIM&JG authors want to be correct or at least have us believe they are correct-further research/evidence should be referred to and studied. I believe if they look at blueprints, or other original GM documents and not revisions of a revision-they will agree with my statements. But hey, as I started out-this is my two cents worth and I do not write the manual. I guess we have to agree: what Matt's pictures are of; ain't of a correct #093 for his car, and that is what his original question was.

Mike

[David L.]

Re: 1966 distributor 1111153 vacuum control

no, a correct part would be stamped 355 15

Bill,

Is your answer based on what you have actually seen on an original 1111153 distributor or is it based on information published after the year 1966.

My 1966 Chev. Parts Catalog (Oct. 1965) lists the 1115355 vacuum control for the following models:
65 PASS. w/SHP(396)(exc. T. Ign.)
66 CORVETTE w/A.I.R. (327)(exc. SHP, P.G.)
66 ALL, CORVETTE (427)(exc. SHP, A.I.R., T.H.)
with the following distributors: 1111100, 1111112, 1111117, 1111140, 1111141, 1111142

My 1969 Chev. Parts Catalog (Oct. 1968) adds the following distributors for this 1115355 vacuum control: 1111194, 1111257

According to Chevrolet Parts History (for over the counter parts) the 1111153 distributor was replaced in Oct. 1967 with 1111194 then in May 1969 to 1111490 then in Nov. 1970 to 1112020.

Dave

[Duke W.]

Re: 1966 distributor 1111153 vacuum control

TI).

Duke's indication of the #201 being used in 64 has me baffled. I personally have never seen an original unit with a #201 prior to 67 (SB or BB), as all Corvette P/N's used a #236 (as per the spec book) for SB distributors in 64. Now, it is very likely the #201 was used as a Serv Rpl part for the #236, which was phased out of the OEM line in and replaced OEM with the #201 in SB applications. The #201 was however spec for the #258 distributor and other application starting in 67.


Mike

What VAC does your data indicate was used on '64 250/300 HP engines?

I can assure you that all 1963 distributors are speced at 15 @ 15.5", which is the spec for the 201. Same for the '62 250/300 HP engines. It was also original on my SWC's 340 HP engine and turned out to be the culprit that caused my idle stability and stalling problems. I replaced it with a 236 circa 1965, which solved the problems. That's when I came up with the "Two-Inch Rule".

I guess I threw away the 201. Too bad, because it was not available through service parts after about 1965 even though it was OE on later engines like L-71.

Duke

[William C.]

Re: 1966 distributor 1111153 vacuum control

My information is correlated from several sources, with my favorite being the delco remy service documents that were supplied to authorized delco service centers. Also Several editions of the chevrolet parts manuals, (printings 1960 1963 1968 1978 1982) ncrs specs, and others. The matrix references ALL THE SOURCES THAT ARE USED IN A SPECIFIC LISTING. I did not find any conflicting information in the delco and Chevrolet info that I recall. Again I was not looking to answer your questions at to what were all the applications for a vacuum advance, but the inverse, what vacuum advance was correct as originally installed on a specific year and part number of a Corvette distributor. Drop me an email so I can reply directly if you want a copy of the info.

[David L.]

Re: 1966 distributor 1111153 vacuum control

Bill,

I believe that you are correct about the "MS 355 15" vacuum control being correct for the 1111153 distributor. Enclosed in the link below is page 13 from the AMA Specifications for the 1966 Corvette dated 10/7/65 (revised 3/25/66). As indicated by my hand written notes both the 1111153 and 1111141 distributors have a Max. deg. in. Hg. of 15 @ 12".

Thanks,

Dave

[David L.]

Re: 1966 distributor 1111153 vacuum control

I personally have never seen an original unit with a #201 prior to 67 (SB or BB), as all Corvette P/N's used a #236 (as per the spec book) for SB distributors in 64. Now, it is very likely the #201 was used as a Serv Rpl part for the #236, which was phased out of the OEM line in and replaced OEM with the #201 in SB applications. The #201 was however spec for the #258 distributor and other application starting in 67.

Mike

Apparently the "MS 201 15" vacuum control was used on the 1970 Z28. Someone has a 1100-mile 1970 Z28. See link below (photo of vacuum control is shown in engine photos).

Dave

http://www.1970z28camaro.com/

[Duke W.]

Re: 1966 distributor 1111153 vacuum control

Get Clup's spreadsheet or maybe he can attach it to the TDB. It's an excellent piece of research and documentation and should go a long way in establishing what VAC was OE on what engine.

Duke

[William C.]

Re: 1966 distributor 1111153 vacuum control

201 was spec'd on hydraulic lifter Corvette in '62 (earliest I believe) and then '63-64 low horse, then infrequently for what would assume were certification "get arounds" with emissions on certain packages.

[John H.]

Re: 1966 distributor 1111153 vacuum control

Someone has a 1100-mile 1970 Z28.

Dave -

That's Charley Lillard, well-known in the Camaro hobby - he has an amazing collection of rare/original early Camaros, and he buys each of the pro resto-mod Camaros built by GM Engineer Mark Stielow.

[Duke W.]

Re: 1966 distributor 1111153 vacuum control

201 was spec'd on hydraulic lifter Corvette in '62 (earliest I believe) and then '63-64 low horse, then infrequently for what would assume were certification "get arounds" with emissions on certain packages.

I was also used on 340/360 HP engines. It didn't work on the 340 - didn't meet the "Two Inch Rule" and caused me all kinds of idle stability and stalling problems until I figured it out and replaced the 15.5" 201 with 8" 236 circa 1965.

I didn't cause a problem with FI because the 360 HP FI engine had that one year only ported vacuum advance nonsense.

All year L-71s had ported vacuum advance too, so it wasn't a problem - you don't need to meet the Two-Inch Rule with ported vacuum advance.

My theory why all '66-'67 L-72/L-71 had ported vacuum advance is that it was required along with AIR to meet CA emission requirements. Since these were low volume engines, the decision was made to not release a second carb with full time vacuum advance for 49-state versions, so they used the same ported vacuum advance carb as the CA versions. All market '68-'69 L-71s and most engines from that point on had ported vacuum advance, regardless of whether they had AIR or not because federal emission standards went into effect in 1968.

That helped ensure that all L-72/71 whether 49-state or CA specific "ran hot", and guys are still fighting the problem, today. The solution is to covert all to full time vacuum advance. The OE 360 VAC on L-72 is okay because it meets the Two-Inch Rule. The OE 201 on L-71 does not, so the 201 needs to be replaced with the current 12" B20 or B26 on L-71s converted to full time vacuum advance, and this same VAC is what I recommend to replace dead 360s.

Duke