Need Help to ID a Distributor

[David L.]

Re: Need Help to ID a Distributor

What I think your calling the cam, which is shaped kinda like a hook and there are 2 of them, has the number 37 stamped into it. There is a number 724 and CCW stamped into the bottom of the plate that cam's mount too. Does that help?

Bob,

My 63 Corvette "1111024 2J20" distributor has weights stamped "37" (GM # 1924737).

What is the number stamped on the "football" at the top of the shaft? You may have to remove one or both springs. The number may also be on the other side of the "football".

Dave

[David L.]

Re: Need Help to ID a Distributor

I found this Technical Service Bulletin (DR #728) dated March 22, 1965, about the MS 201 15 vacuum control in my library.

Dave

[Duke W.]

Re: Need Help to ID a Distributor

Thats and interesting TSB. I never did like the increased vacuum advance for the '65 250/300 HP engines nor do I know why they changed it. The 201 15 was used on '62-'63 engines. The AMA specs also show the same specs for '64, so my assumption is that the '64 250/300 HP engines also used the 201. The higher advance VAC must have increase total idle advance to far. With the low overlap base cam it should be low to mid-twenties, so with 6-10 initial, it's in the ballpark.

I'm not aware that Chevrolet ever addressed the 201 15 issues on the '63 340 HP, but I figured it out myself about the time of this TDB and installed a 236 16, which solve my idle stability and stallling problems.

Duke

[Wayne M.]

Re: Need Help to ID a Distributor

Dave --- good find on that TSB. Here's a pic of my 1965 P&A30, with the sheet revised May 1st 1965, just past half way through production. I've color coded what they're calling for service for all Corvette distrib's, including the 396.

The more I look at this info, the less I feel we can use this as an indication of typical factory production. Aren't there any bone stock unmolested cars out there ?

P.S. caution: there are 3 active threads on the general subject of distributors.

[David L.]

Re: Need Help to ID a Distributor

Wayne,

The photo below is from my 1963 Chev. Parts Catalog (Oct. 1962). The 1116201 vacuum control was replaced with the 1116163 vacuum control in Jan. 1965 (for over the counter parts) but was used in production of this "bone stock unmolested" 1970 Z28 (see link below, engine photos).

Dave

http://www.1970z28camaro.com/

[William C.]

Re: Need Help to ID a Distributor

Unfortunately, the pictures of the distributor conveniently leave out the stamp on the side of the distributor that would give us the part number and date??? Interestingly, as the Camaro was a mid-year intro, I can't find a Distributor for it in either the '74 Chevy parts book (all other years for Z-28 but not '70) Makes it a little hard to verify, especially as the '71 version of the same engine (w/reduced compression) I have one reference to 1112003 for '70 Sp High Perf Camaro, and if that is correct, the Delco info indicates the Imfamous 201 did indeed rear it's ugly head on the '70-Z.

[Wayne M.]

Re: Need Help to ID a Distributor

Wayne,

The photo below is from my 1963 Chev. Parts Catalog (Oct. 1962). The 1116201 vacuum control was replaced with the 1116163 vacuum control in Jan. 1965 (for over the counter parts) but was used in production of this "bone stock unmolested" 1970 Z28 (see link below, engine photos)....

Dave -- I agree with the Jan '65 for 201-->163 (service). I have an almost brand new 1111296 distr. ('68 L71) with a 201 that still has the inspection symbol on the can. Also, I believe the '69 L71 1111926 used the 201. So it looks like it was still in production, but not service.

BTW, the earliest service history I show for the 201 is when it superceded a 1116148 (non-Corvette) in 2-62, so it's been around for a while. Also, history shows 1116238 is superceded by 1115357 on 7-66.

I'm guessing that GM service was just "rationalizing" inventory so they reduced cans to the bare minimum that would fill service needs.

[David L.]

Re: Need Help to ID a Distributor

Unfortunately, the pictures of the distributor conveniently leave out the stamp on the side of the distributor that would give us the part number and date??? Interestingly, as the Camaro was a mid-year intro, I can't find a Distributor for it in either the '74 Chevy parts book (all other years for Z-28 but not '70) Makes it a little hard to verify, especially as the '71 version of the same engine (w/reduced compression) I have one reference to 1112003 for '70 Sp High Perf Camaro, and if that is correct, the Delco info indicates the Imfamous 201 did indeed rear it's ugly head on the '70-Z.

Bill,

The 1112003 distributor is listed for the 1970 Z28 in my 1970 Chevrolet Parts Catalog (Jan. 1970 for 1970 models only). Apparently the 1112003 distributor was never installed on a 1970 Z28 as per my research on the Nasty28 website. The 1112019 distributor was the actual distributor installed in the 1970 Z28 (Jan. 1970 to 1st week of Aug. 1970 production) with the following dates: 9M14, 0A21, 0C18, 0E13, 0F25. There may be one or two more dates but so far only these five dates.

No one on the NastyZ28 website has ever seen a 1112003 distributor. According to Chev. Parts history GM # 1112003 was replaced by GM # 1112019 in May 1970 for over the counter parts.

Dave

[William C.]

Re: Need Help to ID a Distributor

And a 1112019 did also use the infamous '201 vacuum, again my supposition would be to keep vac advance inactive at idle for emissions purposes. There were some very strange work-arounds in the early 70-'s to "pass the test" without regard to real world performance-driveability.

[Bob P.]

Re: Need Help to ID a Distributor

Mike, Doesn't sound like you remember me, but I did have you go through a #093 distributor I purchased for the car last year and you check it out and sold me the other components I needed for the system. This is the distributor that was in the car when I purchased it. I can take a picture of the top of the main shaft "football", so we might be able to tell more. I can tell you now that the weights have the number "37" stamped into them. The underside of the "football" has the number "734" and "CCW" stamped into it.

[David L.]

Re: Need Help to ID a Distributor

Bob,

You have to remove the shaft to see the bottom of the "football" to see if there is a stamped number.

I have collected many Chev. & Corvette distributors over the past 30 years. I have never seen a cam stamped "734" & "CCW".
I have seen the following cams:
526 CCW
530 CCW
532 CCW
536 CCW
540 CCW
724 CCW
728 CCW
732 CCW

Dave

[Bob P.]

Re: Need Help to ID a Distributor

Sorry, My mistake. It is 724 CCW.

[David L.]

Re: Need Help to ID a Distributor

Based on my research a 63 Corvette w/F.I. distributor (GM # 1111022) has a "724 CCW" cam, "37" weights, a "MS 201 15" vacuum control, and a "football" stamped "54".

Dave

[Wayne M.]

Re: Need Help to ID a Distributor

(Here's one that demonstrates that the "weight plate" (rotating pole) number was used on different shafts and with different "auto cams" (=footballs).

Both numbered 534 on the top; the one on the left is off my NOS ball bearing distr. 1111263 and the other off my 1971 LT1 1112038. But these assemblies are different (with a different part #) because of the large hub on the '263' [see how the center hole cuts into the centrifugal advance slot].

Football stamping on the latter is "170W" on the underside, and on the ball bearing unit "94", also on the underside.



n

[John H.]

Re: Need Help to ID a Distributor

(Here's one that demonstrates that the "weight plate" (rotating pole) number was used on different shafts and with different "auto cams" (=footballs).

Both numbered 534 on the top; the one on the left is off my NOS ball bearing distr. 1111263 and the other off my 1971 LT1 1112038. But these assemblies are different (with a different part #) because of the large hub on the '263' [see how the center hole cuts into the centrifugal advance slot].

Wayne -

Interesting - I have a generic 111211X passenger car aluminum points distributor (1970-something item from NAPA) in my parts bin, and the weight plate/points cam is stamped "534 CCW" on the bottom; the top of the "football" is stamped "211W".