1971+ rear alternator bracket strap MOUNTING pics please
 

Can anyone provide a pic of the rear alternator mounting bracket mounted on 1971+ firebirds?

I know the one side uses that stud on the thermostat housing, but would like to see it mounted to the head - what stud/bolt is used there and how it holds the alternator.


Also, I see this strap is apparently and oddly not reproduced - used ones get listed for "1971-1974" sometimes and 1971-1979 on other sites. Reason for?

Thank you.



https://www.firebirdcentral.com/1971...p/enc-2232.htm

The 70 rear bracket looks similar, but it is way different. Listing should be 1971 to 1975 IIRC. in 76 the alternator bracket changed on the front side and many cars didn't use a rear bracket.
The intake side just slides on a intake bolt/ stud

Rear Alternator Pictures
 

Here are a couple pictures I had on my computer from my 73. I will try to locate some more.

Period, I noted your spacer.. I gotta look that up in the assy manual.. thanks for pics!

Most common '71+ rear alt bracket was used with 71+ 10SI alts like the 927's & 928's.

Less common '71-76 Pontiac alternators were the large case 27SI alternators like '71-73 1101015's and the later "1024"s & "1016"s. This setup required an 80 AMP only rear bracket, & were used on '71-76 Pontiacs with factory AC and Rear De Ice (grid style defroster). This set-up is what we are seeing in PEPI's pic of his F-body's 80 amp Alternator.

Have rear brackets for both styles, stocked fairly deep on all 80 amp Pontiac pieces EXCEPT Idler pulleys & fixed front 80 amp alternator brackets.

Thanks all. Those pics help. I did also notice that spacer on yours.... appreciate it.

'71 set up...
https://forums.maxperformanceinc.com...d.php?t=383724

Thanks man. I see on that thread for the 1971 set up the 2 little steel p/s pump brackets appear to NOT be painted - mine originally showed no signs of black paint either. Wonder if some got black paint and some didn't. As you typically see them painted or powder coated black today.

@ol Pinion head -- your inbox is full

Pepi,

A little derail, your 73 looks to be the 2nd design emissions system. Do you have the Distributor Spark Delay Valve circled in orange in this picture? Looking for any info on this valve for 2nd design 73.

Thanks,
Stuart “Stan” Landreth

Stan,

Mine is the late 2nd design emissions. I do not have that spark delay valve. When we bought the car 43 years ago, the original owner had put a Holley carb on it, but kept the original and we put it back on. The original white striped hose always went from the TCS solenoid to the distributor. Recently I started looking again for one and found one at $300, but when I look at the parts manual, I didn't see where it was listed for my engine. I am starting to wonder if not all engines got it.

Thanks,
Karl

Here's some pics of the alt bracket on my 71 TA 455 HO. Can't swear they are 100% correct but they look it to me. No spacers between bracket and alternator on mine.

https://hosting.photobucket.com/9a0f...60c9583db.jpeg

https://hosting.photobucket.com/9a0f...7d56ffff6.jpeg

https://hosting.photobucket.com/9a0f...694131687.jpeg

https://hosting.photobucket.com/9a0f...2e55296ec.jpeg

John

I noticed your bracket is bent towards the alternator whereas mine is bent away from it, thus requiring the spacer. Item 19. According to this it is for 71-74.

I see that on the drawing. I may very well be missing the spacer and someone may have just tightened the bolt up without the spacer, probably using a shorter bolt than original.
I don't know as much about these 71-up setups.

John

Don't confuse the 80A alternator to the 37/55A units.

Good point!

Stuart, start a new thread trying to ask that question on info. I'll try to answer.

HFR,

Appreciate the offer! I did find it. Just had to pay attention and read bulletin 73-T-21A. It was right in the chart. Concerning 455’s, only wagons got the Spark Delay Valves. Other displacement were hit and miss.

Photo stolen from JohnTA1.

Thanks,
Stuart

Boy, do I feel like an idiot. I have looked at that chart before and never looked all the way to the right and noticed the column that mentioned Spark Delay Valve. That would have saved me a lot of hassle looking for one. Now I have to see if the chart I have has that column. But does confirm that I do not get it on my engine.

Thanks for that!

Pepi,

Same here lol. I just kept looking at the picture showing the delay valve. I bought an incorrect NOS one for what I believe is the applications that do use it. I definitely paid too much for it and now don’t need it.

Thanks,
Stuart

Stuart,

I finally got around to pulling out my paperwork to look at the chart, and mine doesn't have that column for whether or not a spark delay valve was used. That is why I had never noticed it before.

Pepi,

I did have it staring me in the face. What is the TSB you have?

DTB (Dealer Technical Bulletin) 73-T-21 and DTB 73-T-21A (chart is the same in the Craftsman Service News 1973- Number 2) list that column.

What stud or bolt etc is used on the intake manifold to mount the bracket? I am mocking it up and appears you need a spacer on the bolt at the intake maniold (all stock parts by the way for a 55 amp alternator)...

Is this it?

https://www.classicindustries.com/pr...A8700191.html?

I didn't have a TSB, I think I was looking at the parts catalog that showed the same chart, but without the last column.

Pic, 1970 on a stud in goose neck. Need a spacer for alternator rear.

I was seeking what bolt/stud/spacer etc is used to mount the bracket on the head side of the intake manifold....

Any pics appreciated.

Other side of bracket. This is a 1970 ONLY set up FYI..

Assembly manuals help...

Yeah I have one but can't see style of stud in head. The stud must have some thick spacer/head on it as my bracket will not get down low enough without a considerable spacer etc on stud. And when mounting to alternator, rear strap also needs a spacer there as well which 1972 diagram does not show but others pointed out their car having. Photo of stud style used on head appreciated

It's the same stud (9798854) as the 2 on the other side for the A/C bracket. Washer (spacer) (9779596) is used on all three studs. The Inline Tube stud is probably close (the one in your link).

Ahhh... I now see the kit I got did not have the proper "bolt-studs" used for the coil, alternator bracker and A/C bracket.

This kit has them!

https://www.inlinetube.com/products/inl11353

So you're doing a '72 HO?
https://forums.maxperformanceinc.com...d.php?t=684975

Thanks as I did just see that page last night actually. Great to add it to this thread

Ok here is the deal. No one sells a proper stud/bolt kit for 455HO intake manifolds. Not enough studs and/or bolt-studs.

And actually the photo shown in the inline tube link is incorrect as those stud-bolts shown are really just studs with a washer under the 'nut' on the stud. They are not shouldered like oem.

AMK sells the right "bolt-stud" at a whopping $12 each. Do it once, do it right. Ha.


https://www.amkproducts.com/bulk-fas...oduct_ID=15557