Spec on long bolt?

[N2BUICK]

Does anyone have the specs on the long alternator bolt? This is on a 86/87 turbo car. I have let my last one get away and want to try and source a replacement.
I see on GN/ttype site two part numbers, 25518197 and 25518198. I didn't know there were two parts so close on specs. The 197 part says 3/8-16 X 33.5/ M10-1.5 X 17
The 198 part only difference is 3/8-16 X 44.5/M10 X 1.5 x 17.
The 17 length is puzzling , my 86 GN bolt only appears to be near 7"
Where are either of these parts used, one having a 10MM longer thread on one end?
Can these bolts be purchased ? None came up on line with a brief search.?
What is the diameter of the bolt, if anyone has one?

thanks

 

[earlbrown]

They can't be purchased new anymore. I'm guessing the ''17'' is the length of the titty that's on the outside of the nut. ( I was thinking it was 8mm not 10mm though)
That's one of the oddball ''TR specific'' shit that GM did back then. As a general rule, all the fasteners that thread into plain ole shitbox 3.8 are SAE. Anything TR specific is metric is metric.
And there's a few areas on the engine where both world exist at the same time.
As far as the exact dimensions for the bolt you need, I have no idea, I've never measured mine.

What's funny is I've seen the bolt discussed on FB a few times in recent history and I'm wondering if I should tool up and do a production run to make some replacement.


I have a feeling if I actually mention it, a bunch of people will chime in, then when I make a batch, there'll be nothing but crickets.

 

[MCH86GN]

They can't be purchased new anymore. I'm guessing the ''17'' is the length of the titty that's on the outside of the nut. ( I was thinking it was 8mm not 10mm though)
That's one of the oddball ''TR specific'' shit that GM did back then. As a general rule, all the fasteners that thread into plain ole shitbox 3.8 are SAE. Anything TR specific is metric is metric.
And there's a few areas on the engine where both world exist at the same time.
As far as the exact dimensions for the bolt you need, I have no idea, I've never measured mine.

What's funny is I've seen the bolt discussed on FB a few times in recent history and I'm wondering if I should tool up and do a production run to make some replacement.


I have a feeling if I actually mention it, a bunch of people will chime in, then when I make a batch, there'll be nothing but crickets.

Earl,

I would definitely buy 5 or 10. I believe that "If you produce it, TR's will but it". Mine has taken a beating, so much so, that I am ready to take it to a machine shop and see if they can cut me one from SS or Titanium rod.

OP not trying pirate your thread, but Earl I have added some titanium studs and various bolts to replace my old hardware. For the turbine to headers and TB to plenum I purchased Blue / M10 x1.50x45mm / 12 Point and Blue / M8x1.25x45mm / 12 Point studs respectively from JD Customs. In addition, 6 titanium flanged hex head bolts in natural, 5/16 - 18 x 1", for the hub to balancer, 4 titanium socket cap screws with tapered head in burning blue, M8 x 1.25 x 30mm, for the TH 3" DP to the turbine housing and a couple more in burning blue to fasten the vacuum block and throttle cable to the plenum. If you'd like I can send some pictures. I am getting ready to replace my heater core and and maybe my AC Evaporator core and I would like to zip it back up with either titanium or SS (316 Super Corrosion Resistant) if I can figure and find the correct sizes.

 

[Chuck Leeper]

I would definitely buy 5 or 10. I believe that "If you produce it, TR's will but it". Mine has taken a beating, so much so,

That's the reason the guy that invented the engine hoist, also invented the Buick V-sicks.
All in an effort to sell more hoists!

 

[Grumpy]

Can't imagine what they would cost to make . Anyone have a Chinese connection ? Everyone would want them !! Untill they find out how much they cost. What are stockers worth now ? $15/$20 ??

 

[TexasT]

Anything for a specific purpose is bound to be $17.50 or more plus tax and shipping. I bought a couple arp cam sprocket fasteners on a card the other day off the ebay for like $10 shipped for each. Then I searched up fasteners for the flex plate and they were ridiculous from arp. I need to go get a core long block from the wrecking yard. Just the fasteners would pay for it. And I could hope for a nice oil pump pocket in the front cover for a bonus.

 

[Chuck Leeper]

What are the specs for this bolt?
Length under head, dia, thread?

 

[Chuck Leeper]

Anyone??

 

[N2BUICK]

Chuck, have you looked at my original post in April? I have several figures, I got from somewhere. Not sure on length.

 

[Chuck Leeper]

Chuck, have you looked at my original post in April? I have several figures, I got from somewhere. Not sure on length.

Got it!