Correct 70 350 hp 1100990 alternator?

[Terry M.]

Re: Correct 70 350 hp 1100990 alternator?

Fascinating. The order of assembly does not match the AIM. Of course this would not be the first time the UAW did not follow the AIM

The other thing that is becoming obvious is that the support bracket was installed in all kinds of configurations.

Now I just need to find an original bolt

Thanks,


Bill

I would not take it the ROCKFORD was the only headmark. Some other original 1970 cars may yield other perfectly valid headmarks. That said, ROCKFORD might be the easiest to find now days. All you need is a 5/16 bolt that is threaded all the way to the head. You can then cut it too length. No one will ever know.

You can quote me on this. I often use it in the Advanced Judging Seminars:
"There are two ways to get all the judging points. You can try to find the "real deal" or you can fool the judges. Either works just as well." I think this is a good example of a chance for the latter.

[David L.]

Re: Correct 70 350 hp 1100990 alternator?

Does the 3952222 bolt have a "flat" head or is there a "rim" on the head? I went thru my box of 5/16" Chev. bolts and came across the bolt shown in the photo below. The 5/16"-18 X 5/8" bolt has a captured external tooth lock washer. The markings on the bolt are as follows:
3 circles with radial hash marks at the 12:00, 3:00, and 6:00 o'clock positions with a "check mark" in the center. I can't say that I have ever seen this bolt head marking until now.
Dave

[Terry M.]

Re: Correct 70 350 hp 1100990 alternator?

Does the 3952222 bolt have a "flat" head or is there a "rim" on the head? I went thru my box of 5/16" Chev. bolts and came across the bolt shown in the photo below. The 5/16"-18 X 5/8" bolt has a captured external tooth lock washer. The markings on the bolt are as follows:
3 circles with radial hash marks at the 12:00, 3:00, and 6:00 o'clock positions with a "check mark" in the center. I can't say that I have ever seen this bolt head marking until now.
Dave

Dave,

Look at my picture in my post of 2/4/13 (today) at 10:37 AM. At this time it is four posts above yours. So far the only photo posted by anyone. I can't tell you what part number this bolt is -- it came with the car. Not to put too fine a point on it, but the part number isn't of concern to me. However I do recognize there are a variety of reasons that it may be of interest to others.

[David L.]

Re: Correct 70 350 hp 1100990 alternator?

Terry,

In years past I can remember seeing bolts with ROCKFORD markings sold in local hardware stores. Most of these hardware stores are long gone thanks to Home Depot and Lowes.

Dave

[Mike E.]

Re: Correct 70 350 hp 1100990 alternator?

Bill,
I looked at three cars for the bolt. 1) March 70 350/350 with wrong alternator but right bracket, bolts and washers to adjusting arm, etc. 2) November 1970 LT-1 (just after the strike) original alternator, and 3) a very late 71 LT-1 (one of the fraternal triplets) . All had the identical bolt on the back of the alternator. The attachment is my best description of what appears to be an R with scoliosis. The spine is indented as per the sketch. Hope this helps. By the way, there is no sign of any kind of a washer on any of the three. It's (in order) alternator boss--ground wire terminal--bracket with rubberized loop--bolt head.
Mike

[Joe L.]

Re: Correct 70 350 hp 1100990 alternator?

Does the 3952222 bolt have a "flat" head or is there a "rim" on the head? I went thru my box of 5/16" Chev. bolts and came across the bolt shown in the photo below. The 5/16"-18 X 5/8" bolt has a captured external tooth lock washer. The markings on the bolt are as follows:
3 circles with radial hash marks at the 12:00, 3:00, and 6:00 o'clock positions with a "check mark" in the center. I can't say that I have ever seen this bolt head marking until now.
Dave

Dave-----


This looks like an oil pan "corner" bolt. The original alternator lug bolt did not have a captured lockwasher.

[Joe L.]

Re: Correct 70 350 hp 1100990 alternator?

Dave,

Look at my picture in my post of 2/4/13 (today) at 10:37 AM. At this time it is four posts above yours. So far the only photo posted by anyone. I can't tell you what part number this bolt is -- it came with the car. Not to put too fine a point on it, but the part number isn't of concern to me. However I do recognize there are a variety of reasons that it may be of interest to others.

Terry-----


This alternator bolt is kind of an interesting case. It's a special bolt, not one from the part number series which are standard fasteners. Plus, it was never included in the Standard Parts catalogs (some otherwise special bolts are included). It was assigned to parts group 2.313 and was specific to the alternator application.

I cannot figure out what was special about this bolt. The ones I have seen are all trimmed ("non-indented"), standard hex head, 5/16-18 X 5/8", with no integral washer, zinc plated, and of GM 280M material grade. So, what's special about such a bolt? A standard-series bolt, GM #180075, was identical in every way I can tell and was available in the GM "parts bin" at the time. So, there had to be something special about this GM #3952222 bolt but I'll be damned if I can figure out what it is.

[Bill L.]

Re: Correct 70 350 hp 1100990 alternator?

Bill,
I looked at three cars for the bolt. 1) March 70 350/350 with wrong alternator but right bracket, bolts and washers to adjusting arm, etc. 2) November 1970 LT-1 (just after the strike) original alternator, and 3) a very late 71 LT-1 (one of the fraternal triplets) . All had the identical bolt on the back of the alternator. The attachment is my best description of what appears to be an R with scoliosis. The spine is indented as per the sketch. Hope this helps. By the way, there is no sign of any kind of a washer on any of the three. It's (in order) alternator boss--ground wire terminal--bracket with rubberized loop--bolt head.
Mike

Hi Mike,

Thank you for the sketch. This should help in the search for the correct bolt. I remember a picture in the archives with the same bolt.

It is very curious why this is such a unique bolt.

Bill

[Mike E.]

Re: Correct 70 350 hp 1100990 alternator?

This bolt is off an early-November(1971 calendar year) LS5 1972. It has portions of a internal-tooth star washer on it. Don't know about the washer, but the bolt is correct. Back of the R is straight--maybe on the others it could be, too. This one I removed (obviously) and the camera can see better than I can.

[Ron G.]

Re: Correct 70 350 hp 1100990 alternator?

Oil pan corner bolt or timing chain cover bolt. Also. any of the aforementioned hardware has a natuaral finish and not plated like the reproductions are.

[Bill L.]

Re: Correct 70 350 hp 1100990 alternator?

This bolt is off an early-November(1971 calendar year) LS5 1972. It has portions of a internal-tooth star washer on it. Don't know about the washer, but the bolt is correct. Back of the R is straight--maybe on the others it could be, too. This one I removed (obviously) and the camera can see better than I can.

Perfect! Thanks Mike

[Bill L.]

Re: Correct 70 350 hp 1100990 alternator?

Hi guys,

What do you think of this bolt? Correct?

Thanks, Bill

bolt R 002.jpg

[Patrick B.]

Re: Correct 70 350 hp 1100990 alternator?

Bill- The wire support is original. I'll check the bolt heads next time I go to my garage.

Bill- I checked my car today, and the bolt is exactly the same as the one in Mike Ernst's photo (post #37) with a small "R". It is smaller the the "R" in your photo.

[Bill L.]

Re: Correct 70 350 hp 1100990 alternator?

Thanks Patrick,

You confirmed my thoughts.


Bill

[John H.]

Re: Correct 70 350 hp 1100990 alternator?

Cold-heading bolts really beats hell out of the heading die that contains the headmark, and they were changed regularly for maintenance or replacement; it wouldn't be unusual for those heading dies to have several sllght variations in the headmark portion. A cold-header or Fourslides machine runs so fast you have to use a high-speed industrial camera to monitor its operation.