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Old 09-12-2019, 11:34 AM   #1
Race73ta
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HELP !!!! '72 BBC Alternator Issue Mystery

OK, here is by dilemma (pulling my hair out) I am assembling my 402 to install in my '72 C-20 truck. I have the correct, GM original alternator brackets and I purchased the right alternator for my truck and when I put it all together the rear support rod that bolts to the exhaust manifold doesn't reach !

It's about 3/4" short - what am I doing wrong or missing ??? HELP !!!!!!
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Old 09-12-2019, 11:51 AM   #2
uncle
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Re: HELP !!!! '72 BBC Alternator Issue Mystery

I’m pretty sure bolts to the head not the manifold.
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Old 09-12-2019, 11:58 AM   #3
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Quote:
Originally Posted by uncle View Post
Iím pretty sure bolts to the head not the manifold.
I thought of that as well but there are no open holes above the exhaust manifold that the rod could reach. I have looked at pictures but none Iíve been able to find are clear enough to see where it bolts to !
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Old 09-12-2019, 12:01 PM   #4
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Re: HELP !!!! '72 BBC Alternator Issue Mystery

Maybe some one can post a clear picture of the whole assembly on the engine.
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Old 09-12-2019, 12:10 PM   #5
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Re: HELP !!!! '72 BBC Alternator Issue Mystery

This brace bolts behind the alternator, bolt through brace then into alternator.
Ive seen it bolted to front of alternator.
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Old 09-12-2019, 12:16 PM   #6
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Re: HELP !!!! '72 BBC Alternator Issue Mystery

Post 11 here has a picture.
http://67-72chevytrucks.com/vboard/s...d.php?t=760308

Think the head bolt hole is above and to the rear of the 2nd exhaust manifold bolt from the front.
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Old 09-12-2019, 12:16 PM   #7
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Re: HELP !!!! '72 BBC Alternator Issue Mystery

Hi Randy, Thanks, I know it bolts to the back/behind part of the alternator. I have been able to confirm this looking at various pictures. It's the rod that bolts to the back of this bracket that is driving me crazy !
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Old 09-12-2019, 12:19 PM   #8
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Re: HELP !!!! '72 BBC Alternator Issue Mystery

If that picture in the thread doesn't clear it up then i can move some stuff and lower my truck from the lift....

Have a mod move this thread to the message forum.
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Old 09-12-2019, 12:25 PM   #9
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Re: HELP !!!! '72 BBC Alternator Issue Mystery

Randy, I have that picture saved but it doesn't help when it comes to where that rod connects to the engine - I really need to see where it bolts to on the engine.
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Old 09-12-2019, 12:58 PM   #10
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Re: HELP !!!! '72 BBC Alternator Issue Mystery

Try this.
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Old 09-12-2019, 01:01 PM   #11
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Re: HELP !!!! '72 BBC Alternator Issue Mystery

Thanks Uncle, can you send a link to the picture - it's exactly what I need but too blurry to see the detail. Thanks !!!
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Old 09-12-2019, 01:04 PM   #12
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Re: HELP !!!! '72 BBC Alternator Issue Mystery

Quote:
Originally Posted by uncle View Post
Iím pretty sure bolts to the head not the manifold.
you are right it bolts right above the #3 cly. exhaust manifold port in a 3/8 hole
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Old 09-12-2019, 01:52 PM   #13
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Re: HELP !!!! '72 BBC Alternator Issue Mystery

I googled 72 truck 402 through the board,then went to images. Not too far down in the images. Not too computer savvy. Maybe you can find it this way.
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Old 09-12-2019, 01:56 PM   #14
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Re: HELP !!!! '72 BBC Alternator Issue Mystery

Thanks Anew - You are right !!, I'm running an earlier set of heads that doesn't have this hole/boss on the head - MYSTERY SOLVED !!. Luckily I was rummaging through one of my cans of bolts and found a small bracket that I can bolt on the exhaust manifold that should work just fine to connect the rod at the right location and height. Thanks to all who contributed - no more hair pulling.
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Old 09-12-2019, 02:02 PM   #15
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Re: HELP !!!! '72 BBC Alternator Issue Mystery

Thanks, found it and Anew4961 was right - my heads are different. Thanks again for your help.
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Old 09-13-2019, 09:33 AM   #16
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Re: HELP !!!! '72 BBC Alternator Issue Mystery

If your interested in selling that rod I lost mine. I think I finger tightened it and forgot to snug it up. Thanks, Tom
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Old 09-13-2019, 10:29 AM   #17
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Re: HELP !!!! '72 BBC Alternator Issue Mystery

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Originally Posted by Blazer690 View Post
If your interested in selling that rod I lost mine. I think I finger tightened it and forgot to snug it up. Thanks, Tom
Hi Tom, no, now that I've solved the mystery I'm going to need it to put it together. I'm sure someone out here has a spare.
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