'67 327 Fan Blade

[David P.]

Hello,
Could someone tell me the correct fan blade for a 67 327-350hp? I searched the archives to no avail.
I have an opportunity to buy a PN 3770529 5 blade 17 1/8 in diameter blade, but I want to make sure it is correct for the car.
Thanks.
DAP

[Larry M.]

Re: '67 327 Fan Blade

Hello,
Could someone tell me the correct fan blade for a 67 327-350hp? I searched the archives to no avail.
I have an opportunity to buy a PN 3770529 5 blade 17 1/8 in diameter blade, but I want to make sure it is correct for the car.
Thanks.
DAP

David:

I assume you do not have AC? In that case (no AC), the number #3770529 should be correct.

Also checkout LI Corvette website for fans: http://www.parts123.com/parts123/yb....Z5Z5Z50000370a

Larry

[David L.]

Re: '67 327 Fan Blade

My original 1966 17 1/8" dia. 5-blade fan with "flat head" rivets is stamped "FRONT" and "H" on the front and "W" on the back.

I also have a NOS 3770529 fan that I bought in the early 1980's and it does not have the "W" stamping.

Dave

[Gary B.]

'67 327 Fan Blade

I assume a '67 no AC fan will be the same as a '66 no AC fan.

The newest edition of the '66 TIM&JG calls for the H stamping on the front, the W stamping on the back, but no FRONT stamping. Most of the service replacement fans I've seen have the FRONT stamping, but not the W stamping.

Gary

[Jack H.]

Re: '67 327 Fan Blade

I remember a prior post on this subject where one contributor pointed out the fan was a purchased part, there were at least TWO qualified suppliers and their marks on the fan were different with one of the two stamping the center spider with 'FRONT'

[Gary B.]

'67 327 Fan Blade

Jack,

If there were two suppliers, one who stamped FRONT, that should be an item to put on the list of things for the '66 TIM&JG revision team to look into, since the JG makes no such mention. Since I typically judge chassis, I've always seen the presence of a FRONT stamping result in a deduct, based on the believe such fans were service replacement parts only.

Gary

[Jack H.]

Re: '67 327 Fan Blade

In my opinion, each NTL (and his JG revision team) is responsible for the accuracy of what's published that influences judging and scores. Even in situations where a given AIM is crystal clear that there was more than one qualified part supplier (call out is PN for the primary followed by one or more different part numbers designated 'OPT'), we have cases where our JG books fail to recognize the additional sources!

I thought the thread I referred to was interesting, but it's not my place to challenge windmills... I can remember when there was HEATED controversy on the judging field as to whether correct/original mid-year fan clutch was based on a bar vs. coil sping actuator!

We also have situations where essentially the same part was used for multiple model years and one JG says the correct part is this, while the adjacent year JG says it's something else.

Bottom line take the JG for what it is, a best efforts description intended as a guide or supplement to the specific knowledge of the judges, or it's easy to go nutz wanting to correct all the 'errors'--immediately & overnight.

[Peter L.]

Re: '67 327 Fan Blade

Jack -I certainly agree with you on the fact that when there are 2 parts (part numbers) listed in the AIMs and the one is labeled OPT that it either fails to get "credit" or it causes considerable debate and/or confusion. It is not "rocket science."

As far as the 66 & 67 base motor and L79 Corvette engines without C60 air conditioning are concerned (to the best of my recollect since I am not at home) there is only one fan blade assembly listed in the AIM and it is the same 5 blade, 17-1/8" dia fan blade assembly for both years. The original fan blade assemblies installed on the 66 and 67 sb Corvette w/o A/C had the 5 flat button head rivets w/ a "H" (for Hayes-Albion) stamped on the front of the center hub, and a "W" stamped on the back on one of the support arms.

Pete

[Jack H.]

Re: '67 327 Fan Blade

Yeah, Pete, the 'OPT' cases are real no brainer situations. But, there are situations where only one TS flasher is recognized here/there; this version of the part is recognized but not the others occassionally...

I never really understood the how/why of multi-source items at GM. Sometimes, a separate PN was issued for each part/supplier with the factory given the 'OPT' method of deciding who to buy from/use on the line.

Other times, there was a master PN issued with n-tuple suppliers qualified against the same part number. In these cases, it's not obvious who was actually supplying the factory on any given day. We only learn by either hearing from those who were 'inside' and privvy or we discover different parts on 'untouched/original' Corvettes. The latter method is definitely prone to small sample skew...

Consider the 1972-73 horn relay. It's a single PN and that was when Corvette departed from Delco Remy being the supplier. The '70-72 JG calls out only one version with a black plastic base. But, the '73-74 JG admits there 'might' have been a second supplier with a white plastic base. It's the same GM PN for both '72 and '73...

I've pulled maybe fifty originals off '72 and '73 Chevy's in the scrap yards and the black plastic base part came from Littelfuse. The white plastic base part came from Essex. Heck, there might even have been other qualified suppliers. It was VIRTUALLY IMPOSSIBLE to get qualified as a sole source for a production part at General Motors!!!

So, if you know the item was purchased vs. made internally (in this case you say the fan was supplied by Hayes-Albion), then it's also relatively obvious that there HAD to have been a qualified second source for that part. It shouldn't be a surprise that anything that was purchased from a supplier had at least one alternate source...

Now, how many of the second source parts were actually used on this/that assy line in this/that time frame, well that's something we'll probably never know. I can remember the fool's errand of trying to sell GM something that was absolutely unique (patent protected with nobody in the world licensed) when I worked for Texas Instruments. You literally had to climb the mountain for approval...

[David L.]

Re: '67 327 Fan Blade

CORRECTION!!!!!!!!!!!!!!!!!

Earlier this evening I dug out my original 1966 Corvette 5-blade fan just to double check and it only has the letter "H" (for Hayes-Albion, the manufacturer) on the front side and the letter "W" on the back side. I know it is original because it had a Schwitzer type fan clutch dated "SC 1-26-66" stamped on the rim of the hub. The body build date of my car is "F24" (Feb. 24, 1966), supply tank is "66B", Muncie is dated "P0211" (Feb. 11, 1966), rear axle housing is "AK 2 16 66" (Feb. 16, 1966), flywheel is dated "A 7 6" (Jan. 7, 1966).

The fan does NOT have the word "FRONT".

I am SORRY for the error. I should have double checked before I commented.

Dave

[David L.]

Re: '67 327 Fan Blade

I assume a '67 no AC fan will be the same as a '66 no AC fan.

The newest edition of the '66 TIM&JG calls for the H stamping on the front, the W stamping on the back, but no FRONT stamping. Most of the service replacement fans I've seen have the FRONT stamping, but not the W stamping.

Gary

Gary,
Thanks for the wake up call. I double checked and my original 1966 fan does NOT have the word FRONT.
Dave

[David P.]

Re: '67 327 Fan Blade

Thanks to all for all the information posted. By the way my '67 is a non-AC car.

Follow on: Any idea as to a fair price for a NOS 3770529 blade?

Thanks again.

DAP

[David L.]

Re: '67 327 Fan Blade

I really have no idea what a "fair" price is for a NOS 3770529 fan. A NOS 3770529 fan made in 1967 is obviously worth more than a NOS 3770529 fan made in the 1980's. Over the years I have seen many NOS 3770529 fans on Ebay for very reasonable prices but the stampings on them are probably not the same as those on a factory installed fan from the 1967 production line.

Dave

[Wayne M.]

Re: '67 327 Fan Blade

I assume a '67 no AC fan will be the same as a '66 no AC fan.

--- and probably the same as the '63 thru '65 base fan (except for the rivets) ... same part # '529'. I have an original off of (either) '64 VIN 86xx or '65 VIN 10xxx; mushroom head rivets; only 'H' on front and NO 'W' on the back spiders. So maybe the 'W' was added, starting in late '65. I always thought it was to designate the spider with the greater blade pitch (for BB's); --- shows how much I know .

The newest edition of the '66 TIM&JG calls for the H stamping on the front, the W stamping on the back, but no FRONT stamping. Most of the service replacement fans I've seen have the FRONT stamping, but not the W stamping.....

Wisely, (IMO) the '65 TIM&JG is silent on stamped markings -- why mention something (the H and FRONT) that you can't see when installed on the fan clutch ?? I can understand the 'W'.

[David L.]

Re: '67 327 Fan Blade

Wayne,

I have never figured out the meaning of the "W" stamping on many of the Hayes-Albion fans.

The stampings on the front of the Hayes-Albion fans are only important to those want correct parts for their car. For those who are interested in only scoring points I guess it doesn't really matter. I think points belong only in sports events, not Corvettes.

Dave