Hey Brett I don't think any of these are what you're after but by chance one is right let me know I'll mail it to you. That's all I got in my bolts bin from the Riv
Bob, that's not an alternator bolt, that's a body bolt. It's 1" from the back of the head to the end, and threaded to the end. The right bolt and washer end flush to the alt.
Just pulled these 2 off of a 70 Riv, and a 70 Lesabre 455. Both cars have air. Both have 3 hash marks, and a TR on them.
Ok, I did look in my garage because I know I had a set of 70 alt bolts I personally took off and bagged. That set has a bolt with the 3 slashes (Grade 5) and a small triangle (Canadian bolt maker mark). It has no letters. I don't know if it was a Canadian car. Flint is not too very far from Canada. My 70 has an indented head bolt. When you look at the assembly manual there is a section in the corner of revisions. The revisions are mostly illegible in my copy. My best guess is that several different makes/types of bolts were used. It's the same for belts, hoses, tires, convertible tops, etc. I'd agree with James and Fred that those bolts are one of the typical bolts that were used. It's not something I'd lose sleep over at all.
Frank, sounds like he has an indented head. That’s what I have found. I have never found one with a washer. That’s why they used a loose washer. Check out this diagram guys. There is no washer on that bolt.
When these guys are picking our bones will any of this matter? They were in a neighbors driveway on my way home. Going to be 60 soon. Hope they are not trying to tell me something?
No attached washer Dave? That is the real sticking point. Different suppliers may have supplied different heads. I find the TR screw at the water pump end of the arm.
There is no captive washer. Bolt is identical to what Fred posted. Also found a TR bolt at the water pump end of the arm. (no washer)
These might be what you're looking for not sure if they're correct for 70 but definitely 71 and 72 they have the same head design
What does the N.S. for the washer designate? Brett, What thickness washer are you planning on using. Cheers, Mike
I'm not sure exactly what N.S. stands for, but it means there's like no service number or stocking number. It's non specific and you can just use open stock. Back in those days, all SAE rated type hardware was kind of heavy duty and universal compared to modern stuff. Now if you go for a washer like that, you look in the draw and they are like 6 different thicknesses!