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#1
03-25-2022, 04:08 PM
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Alternator 902 903 904
Hi group.from what I seen hear and read Im confused a little on alternators for 1970. They are all open face and finned I believe. But seen black.fans zinc fans ,black pullies,zinc pullies,and gold. Then spokes. Are they 6 spoke, 5 spoke or both.i was told 5 only but seen 6 and then was also told 6 and 5 spoke. I realize it's a small detail but still curious. School me please. My car assembled In March of 70
Last edited by Ramairnacho; 03-25-2022 at 04:57 PM. |
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#2
03-25-2022, 05:06 PM
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The earlier open face alternators for 1969-70, including the 902, 903, and 904 were 6 spoke. For the 1971 model year including the 927 and 928, they changed to five thicker spokes.
Also, from what I have seen, the fans and pulleys were both silver cadmium.
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1968 Firebird 400HO convertible 1971 Trans Am 4-speed, white/blue |
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#3
03-25-2022, 05:24 PM
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902903904
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#4
03-25-2022, 05:26 PM
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As said, and I agree 1970 are 6 spoke. However, and was JUST DISCUSSED in another thread in this very forum, the Pulley is Gold Cad and fan is Galvanized ( which I have been doing in silver cad paint as The Galvanized paint is weird, and seems a 1 use deal per can. )
So, PULLEY WAS GOLD CAD ( I have Originals to prove this) FAN WAS GALVANIZED Are we done yet? Want your pulley done Correctly? This involves bead blasting, treating, Silver zinc plated, and then DiChromate coating.
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"The Future Belongs to those who are STILL Willing to get their Hands Dirty" .. my Grandfather Last edited by Formulabruce; 03-25-2022 at 05:32 PM. |
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#5
03-25-2022, 06:48 PM
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lets do some pics
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"The Future Belongs to those who are STILL Willing to get their Hands Dirty" .. my Grandfather |
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#6
03-25-2022, 07:45 PM
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Alternator
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#7
03-25-2022, 10:23 PM
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Pullies I have pulled 70 and 71 and 72 were ALL Gold "cad" .
I have a correct fan, will have to look again, the Galvanize gets gray and dull and makes it hard to see the flakes on the coating. They didnt last a year in appearance in normal use.
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"The Future Belongs to those who are STILL Willing to get their Hands Dirty" .. my Grandfather |
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#8
03-31-2022, 07:37 PM
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https://forums.maxperformanceinc.com...d.php?t=715554
My '903 was pictured here and was a 5 spoke. Can't tell what the plating was...
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So long, farewell. |
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#9
04-01-2022, 04:44 PM
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I am almost certain that some of the very early/first run 1970 alternators 902/903 had the 5 spoke front and the changed came pretty shortly into the 1970 run...
TellyS.....didn't we discuss this before? I think there were known examples out there... |
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#10
04-01-2022, 04:48 PM
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I think i had that backwards.....Maybe strike what i said....I may be thinking that the 69 had 6 spoke (correct) and that some of the later built 69's went to 5 spoke...BEFORE the eventual release of the 1970 style....
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#11
04-01-2022, 04:50 PM
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OK Telly is texting me on the side probably laughing at the confusion i am causing...He claims 6 spoke up until sometime in May 1970.....
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#12
04-01-2022, 07:15 PM
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And you want to be my latex salesman!
Sent from my iPhone using Tapatalk |
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#13
04-01-2022, 08:06 PM
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Jeff!!! WTH....Cant get away from those references after 25+ years..
SERENITY NOW! |
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#14
04-04-2022, 11:39 PM
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formulabruce,
its ignacio and like to know where i can buy a cad pulley for my custom built 904 alternator and possible zinc fan with1 wide blade? |
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#15
04-06-2022, 10:33 AM
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Quote:
ok, I saw this discussion before, but today I was prompted to look; My '902 alternator is a six spoke, and is dated January 27, 1970. I also have an unstamped front housing that is a six spoke design. Now, many don't realize it, but the early (69/70) alternators also have a unique rear case - I swapped my rear case for a later one because the bolt boss for the rear mount is damaged - but I kept it with the front of that alternator that I swapped the rear case for. I hope you're not losing sleep over this minute detail; Not once was my correct alternator noticed.
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1970 Formula 400 Carousel Red paint on Black standard interior A no-engine, no-transmission, no-wheel option car. Quite likely one of few '70 Muncie three speed Formula 400's left. 1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing) 2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs) |
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#16
04-06-2022, 12:03 PM
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The cad looking coating used today looks different on different metals. On carbs it looks perfect. On a steel pulley, even though its zinc plated first, the gold looks a bit brighter. Ignacio. I am going to do a few pulleys this summer. I will be sure to post some pics and save one for you if you like it. Your alternator has no fan or Pulley?
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"The Future Belongs to those who are STILL Willing to get their Hands Dirty" .. my Grandfather |
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#17
04-06-2022, 01:49 PM
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I unfortunately don't have my original 904 or ever seen 1. Haven't been able to find1 either. I located 2 928, and 3 open face blanks and 1 diamond finned 70 back that's slightly chipped. So I got the idea to have one custom made with a blank and correct rear back cover. I could pay extra to have it professionally stamped and say I have an original but I'm not like that. So I want correct fan and pulley
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#18
04-06-2022, 02:57 PM
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Quote:
I'd wager that people would notice paint/plating way before stamping, or the rear of the alternator case; Also, without a 1970 Firebird (suppliment) service manual, or a Master Parts Catalog, I wouldn't know what the correct alternator number is for our cars - the Firebird Red book, and HPP 'numbers crunching' never mentioned the alternator - it wasn't till years after the fact that I realized I had the correct for my car alternator.
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1970 Formula 400 Carousel Red paint on Black standard interior A no-engine, no-transmission, no-wheel option car. Quite likely one of few '70 Muncie three speed Formula 400's left. 1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing) 2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs) |
| The Following User Says Thank You to unruhjonny For This Useful Post: | ||
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#19
04-06-2022, 05:01 PM
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904
Oh it's small detail I guess. This is what I got so far. The front ooen face isn't an original but a blank. I got 2 like this when done probably sell other core.
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#20
04-06-2022, 05:40 PM
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I was astonished when I saw what the rear cases were going for - I looked into it with hte idea of replacing my 902's original - but quickly changed my mind.
I bought an unstamped open face front case to basically make a backup or sit in replacement for my '902.
__________________
1970 Formula 400 Carousel Red paint on Black standard interior A no-engine, no-transmission, no-wheel option car. Quite likely one of few '70 Muncie three speed Formula 400's left. 1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing) 2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs) |
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