Fan choices
 

I have a 67 FB 400, 4 speed, with A.I.R. What type of fan was on the car? Fixed or clutch? Number of blades?

Mine has a flex-fan with five blades of stainless, 17" diameter as I remember.

Anyone, anyone, Bueller...

Come on guys, what fan cam on the 400's?

ttt

Not sure about A.I.R., but 400-4spd used a 5 blade w/clutch. 19" dia., 2-5/16 pitch.
Next time i'm home(work'n 2 jobs), will check old Pontiac parts catalog for A.I.R.

Forgot, all fans where 19" from factory.

This may help: http://thefirstgensite.com/library/fans/fgffans.htm

That chart has at least one mistake. The 69 manual trans with A/C uses the 5 blade power flex fan instead of the 7 blade clutch fan. I think that the same is true for 68 but I'm not positive.

73 Pontiac parts catalog list.
Sorting through mess(way past do) for an earlier version think had a detailed chart.
Forgot to write down part #'s(was 3am after 2nd job), so get'm next nite or 2.
May not help anyway cause GM liked to change #'s every so often.

Clutch;

V8 with A/C exc A.I.R stamped PH
V8 with A/C and A.I.R stamped PG

Fans(all have 2-5/16" pitch);

V8 exc A/C-A.I.R.-HD(4 blade-19")
326 A.I.R. exc A/C(4 blade-19")
V8 HD exc A/C(5 blade-19")
Ram Air(4 blade-19")

I have determined that I had a clutch fan. Any idea if the fan itself is the same for fixed versus clutch?

At least two mistakes, but I bet there are more... 480033 5 blade flex fans weren't used until mid '70. The previous 5 blade flex fans were the "346"s.

The party putting the tech info together is using a later edition parts book where part numbers have been superseded. Can't repeat enough times, quality info on correct parts used comes from disassembling & documenting actual cars, not leafing through (often later dated) master parts books.

Don't believe one could get a regular 7 blade fan (with fixed steel blades) on an early Bird with without a fan clutch. The 7 blade power-flex fans I've pulled before came off overhead cam 6's.

The assembly manual, dated 2/18/70 shows the 480033 and 480036 fans to be used optionally/interchangeably, though I've yet to see a 480036 fan.

Have yet to run across a 480036, either. The 48xxxx lineage part numbers & casting numbers were not introduced until mid summer of '69. The 480033 fan was released for use on '70 Performance V8 Firebirds & also was used on at least mid year '70 Pontiac V8 performance A-bodys & GP's. It was used up through the '72 models. The 5 blade flex fan again changed part numbers (& design) for '73, & went to wider spread between two blades. Have several in the '73 & early calender year '74 range.

The '67 to early '70 usage 5 blade flex fan was speaking of earlier is a 9791346 / "346" for short. Have several mid to late '68 dated versions. Have also pulled quite a few more off '69 models & 70 models & the trend I've noticed is they typically predate '69 Pontiac A-bodys by 4 to 10 months. From what I've examined on original cars, they have not been not tight dated like alternators.

I've noticed that date spread as well. We've covered these on other threads, but I'll mention that the 480033s were configured with either 4 or 3 rivets per blade. The early ones appear to use the 4 rivets.

My car is 3rd week of June 67', 400, 4-speed, with A.I.R. What fan and clutch part numbers do I need to make this thing correct?

Here is my 346 dated J67. I think J is Sept. or should be since I was not used.

So that is a fixed fan and would have the aluminum "stand" behind it? Mine would not have been like that correct? I can't believe this is so difficult to find out this information.

Correct, the clutch fan is completely different from what I've seen. I've heard about 7 and 5 blade but have not had to research them to know the difference.
Have you asked over on the FGF site?