No luck in C2, try C3....

I am assembling a spare TI distributor or two to have as backups should they be needed.

If anyone has reliable part info for shafts and pole pieces regarding a couple of distributors it would be much appreciated. I have the 1111093 distributor that is original to my 66 shp big block, what I think is maybe a 1111142, 1111248 or 1111258 (has no tag, 65/66/67 early big block housing) and a 1112053 (71 LS6 Auto) distributor based on what looks like an original tag. In building the spare distributors I hope to be using original shafts to get a particular advance profile but will be limiting the total advance and increasing the rate it comes in to match what I have found to be best for my shp engine. What I am trying to do is identify the correct shaft and pole pieces by the numbers stamped on them so I know what parts are what since who knows what changes could have been made in the past to any distributor. The 1111258, 1111296 and the 1111928 have the same performance curve data and maybe use the same shaft as is indicated by my Chevrolet parts book.

If you have this data from known originals and are willing to share it, I would like the identifying numbers that you find stamped on the shaft football and pole piece for the following distributors pn’s

1111093
1111142
1111148
1111258
1112053

And if different from the above 258

1111296
1111928

I have a couple of shafts in the distributors that I am looking to rebuilt but am suspect that they may not be the originals. Hoping to get some confirmation before I expend money and effort to refresh what I have or buy parts if/as needed.

 

I cannot offer any specific help. These things only came w/ those aluminum tags that can be easily removed, lost, changed or swapped. I don't know that there is much of a meaningful difference in the actual shafts. But the advance cams have a 3 digit 3 and there are some differences here. Common #s stamped are "524", "530" etc. Supposedly the the last 2 digits correlate to slot length and thus centrifugal advance at the crank. So a 530 would in theory equate to 30*. And if 30 (or whatever) is correct for your application - at least it's functionally correct. But I cannot guarantee the accuracy of the last 2 digits indicating this.

Since you have multiple shafts (and advance cams) - I suggest you lay them out and study them carefully for differences. I'd be curious what you find. Including any differences in advance slot lengths with respect to the 3 digit part #s stamped no the advance cam underside...

 

Thanks for the reply. There can be significant differences it the shafts 'football' on the top that control the shape of the advance curve. My 1973 Corvette parts catalog lists 33 different shaft pn's, the actual number was actually probably higher as some were no doubt out of production by 73. The slot lengths that you refer to are not too important to me as they limit the amount of advance but not the shape of the advance curve. I will be altering the total advance so that becomes less important since I will custom make a sleeve limiter to get the total advance out of the distributor that I want. The shafts also have typically 2 or 3 digits on them, the pic attached shows the one that is in the 71 LS6 distributor that I have (according to the tag), some are stamped on the bottom, some on the top I can buy a new shaft but I went thru 3 defective ones the last time I rebuilt a distributor, the first had gear teeth that resulted in a bind with the cross gear, the second had the football clocked incorrectly and the third was missing the groove on the advance limiter pin. I cut a grove in the last one to make it so that a limiter sleeve could be retained and made it work. Lot of junk out there being sold as reproduction parts.

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