SB A/C Bracket Bolts

[samkost]

For my SB 350 V8 A/C compressor install,
I’m starting to organize and clean my A/C bracket bolts for mounting to the passenger side Rams Horn Exhaust Manifold.
To verify that I have the correct hardware, can someone tell me the correct lengths of these two manifold mount bolts circled?
Stock photos for reference used.
Thanks

[Jason Banks]

I have this stud. GM part 3937247.

I bought it at the dealer in the late 90's. I think it's correct for the stud by #19

Overall length 3 7/8

Long end is 2 5/8

Short fully threaded is 7/8

[Jason Banks]

2nd picture

[samkost]

Perfect!
I couldn’t ask for a better response.
Thanks Jason

[samkost]

OK, thanks again to Jason for the exact bolt specs.
Now for bolt #20, is it longer because of the width of the rams horn center mounting holes.
Can someone verify the length of bolt #20?
The A/C components/hardware were mixed up in boxes from when I first purchased the truck years ago.
Going through and verifying the seven mounting brackets and mounting hardware is a bit challenging to see if I have everything needed.
Thanks again everyone.

[1970cstblazer]

3937247 is the special exhaust manifold bolt/stud on the drivers side on a 350 that the manifold tin heat stove bolts to. In addition to 1969-72 trucks, it's correct for 1976-79 Corvette.

[samkost]

[quote=1970cstblazer;9257442]3937247 is the special exhaust manifold bolt/stud on the drivers side on a 350 that the manifold tin heat stove bolts to. In addition to 1969-72 trucks, it's correct for 1976-79 Corvette.[/quote

When I searched the web with this part number, several links described the Corvette application you mention.

So this special headless stud bolt is wrong for the passenger side lower A/C bracket to the Rams Horn exhaust manifold or it’s dual purpose?
The almost 4” inch length seems correct?

After cleaning my bolts, nuts and washers, I am certainly missing this part and some mounting hardware.
I called LMC to reference their diagram and they couldn’t offer any length specifications to any bolts.
They also don’t offer this specific headless style stud.
I am going to take some depth measurements with the brackets and the exhaust manifold to determine what length hardware is needed.
I found an old forum post that said to measure and deduct 1/4 “ inch for proper fitment to the engine head.
Hopefully a WTB post will help locate some hardware.

Thanks for your reply 1970cstblazer

[1970cstblazer]

Here are some part numbers from a 1979 parts book

[samkost]

Much appreciated.
Very helpful info relating part numbers to their specific mounting locations
Thanks again

[Jason Banks]

Sam did you decipher that list and figure out what the stud part number was?

PM me your address and I'll send you the stud I have. I'll probably never use it.

[samkost]

I have to admit Jason I’m a little lost referencing this stud bolt.
My factory assembly manual doesn’t show a specific 350 V8 diagram/picture of the lower A/C bracket to the exhaust manifold.
The LMC diagram is what I have been utilizing for reference,
What is confusing is that Part# 3937247 is for a Left Hand application.
The bracket stud bolt is for the Right hand exhaust manifold.
Not sure what I am missing but I will figure it out.
I do have all 7 A/C brackets and I believe the rest of the bolt on hardware.
It is just this one stud bolt that I am missing.
I will PM you.
Thanks a ton!

[Jason Banks]

I got your PM Sam, I'm trying not to fill up my PM's...

Glad you got it, updated this thread when you figure out if it works. Might help someone in the future.

[samkost]

Thanks again Jason.

[72Fulton]

Hey guys, I stumbled across this thread because I was looking for that bolt/stud as well. The bolt you listed isn't quite correct. It is 3/8 going into the head and 5/16 for the bracket. I found that classic industries sells the correct bolts as part of a set. The two pictured on the left are the ones for that compressor bracket.

[samkost]

Originally Posted by 72Fulton

Hey guys, I stumbled across this thread because I was looking for that bolt/stud as well. The bolt you listed isn't quite correct. It is 3/8 going into the head and 5/16 for the bracket. I found that classic industries sells the correct bolts as part of a set. The two pictured on the left are the ones for that compressor bracket.

Thanks, 72Fulton.
I was just in Tucson for the Holiday visiting family.
Great time and nice weather this time of the year.
Saw my first Arizona desert down pour!
I appreciate the above info.
Need to get busy soon and get back to work on the 72.
Congrats on your first post and welcome to this great forum site.
Thanks again,
Sam

[Jason Banks]

Wow, that's amazing there is finally someone making that part. Wonder how long it has been around.

[samkost]

Originally Posted by Jason Banks

Wow, that's amazing there is finally someone making that part. Wonder how long it has been around.

My sentiments exactly Jason.
Funny, my past internet criteria searches came up empty and there it is
from Classic Industries.

[67 twins]

Originally Posted by 72Fulton

Hey guys, I stumbled across this thread because I was looking for that bolt/stud as well. The bolt you listed isn't quite correct. It is 3/8 going into the head and 5/16 for the bracket. I found that classic industries sells the correct bolts as part of a set. The two pictured on the left are the ones for that compressor bracket.

I gotta say I like your style. First post and you're answering a question instead of asking one.