67 Fan blade

[Kevin M.]

First let me say I had a great time at the Southern California Chapter meet this weekend at the Peterson. I met so many members I'd be sure to forget somebody so I won't t try and list them all. My car did pretty well and if the 67 class it's not full I'll take it to the regional even if it is I'm going to drive it and get it Founders op checked. So in the next few days I'm going to ask advice on some of the things I got deducted on. First because I have pictures is my fan blade. In the first picture is my fan it has square attachments as opposed to the pointed attachments that were on other cars so I got a non original deduct. My car is pretty original and really don't see a reason someone would change the fan. OK in the second picture in the next post, is the only other fan blade I found like mine. It was on a Bowtie 66 with original A.I.R now my car has it's original A.I.R none of the other cars had A.I.R. I hope to contact the owner of the 66 to see what he has to say. My car is an early Nov 66 car so I'm thinking this might be the correlation. In the judging manual there is no mention of the blade mounting configuration. So here it is guys my first of many questions on the things I learned about my car. By the way I scored well enough that I most likely won't change these things because they've been on the car since my father bought it used I'm just curious.

Kevin ]

[Kevin M.]

Re: 67 Fan blade

Here's the 66 A.I.R blade.

Kevin

[Roy B.]

Re: 67 Fan blade

My 67 #12345 having the original "M" logo

[Kevin M.]

Re: 67 Fan blade

Roy,

That was the most common style on the cars at the meet. I'm just hoping that maybe in the A.I.R components bin they included a different fan, I know the AIM doesn't call for one but it was interesting to find another example on a another A.I.R car.

Kevin

[Peter L.]

Re: 67 Fan blade

Kevin - Very interesting information. The '66 and '67 Corvette AIMs call for p/n 3770529 as the sb PRODUCTION fan blade assembly and this asembly has the elongated triangular supports under the blades and is 17-1/8" diameter.

From your pictures of the the back side the two fans, they look to be the optional fan blade assembly (p/n 3863137) called out in the '66 and '67 Corvette AIMs for sb Corvettes w/ C60 Air Conditioning. This fan blade assembly had the retangular shape to the supports under the blades and the five rivets in the pattern like the spots (dots) on a 5 die. The overall diameter of the 3863137 fan blade assembly is 18".

So there are several things you can do to better determine what fan blade assembly is on the car.

1. Determine the overall diameter of the fan blade assembly. Actually measuring the radius is the way to go since the fan blades aren't symmetrically configured around the center hub. If it is the 3863137 fan blade assembly, the radius will measure 9" . The overall diameter is quoted to be 18".
2. Using a mirror look at the front of the blades at the rear edge of the squared corner and see if there is any stamped information. The 3863137 fan blade assembly will have a manufacture date, a blade part number, and the manufacture's code (1st row: A thru L for the month and the last digit of the year,2nd row: the number 912239, and 3rd row: SC).
3. Measure the individual blade lengths. The individual blade length for the blades of p/n 3863137 is 5-15/16".

If it is the 3863137 fan blade assembly, it either came from the factory (maybe they were out of the standard sb PRODUCTION fan blade assembly), because to the best of my knowledge it was not available as a SERVICE part from the dealer and from an operational perspective it would work as well as or better than the standard sb PRODUCTION fan blade assembly, p/n 3770529. Or, it could well have been installed at a later date to provide more engine cooling as opposed to the smaller diameter sb PRODUCION fan blade assembly, p/n 3770529. If that was the case, it would of from another Chevrolet car that used that fan blade assembly.

If it is the optional 3863137, the date information would be the major key and it it clocks in reasonably before the production date of the car, you'll then have to make those excutive decisions on where to go next in presenting the car's story.

Pete

[Kevin M.]

Re: 67 Fan blade

Peter,

Great inf. the 66 indeed had AC so that's why it had my blade. I'm at work, but before I kiss the wife when I get home it's the first thing I'll check. As you stated if in fact it has the correct date for my car I'm going with the factory ran out or low, I have a Dec 66 build car and all the other parts are from Nov 66. I'm almost sure it's the AC fan, I don't need the points so I'll leave it be.

Kevin

[Robert C.]

Re:Roy, that's a "W" not "M" *NM*

[Roy B.]

Re:BOB, that's a "W" not "M"was on my head *NM*

[Gary B.]

W, H & 4 stampings on 3770529 fan blades

Guys,

On what I believe is the original fan blade for my '66 L79 (no A.I.R, no A/C), I have the letter H stamped near the central mounting flange and a small number 4 stamped into one of the fan blades just outboard of the tip of the triangular reinforcement. The fan looks to be the correct 3770529 that Pete talks about with the traingular supports. I also have an NOS 3770529 fan than looks identical except for the lack of the number 4 stamping, i.e., an H near the mounting flange, but neither of my fans have the W stamping.

What's the deal with the stamped W? Is this seen on most 3770529 fans?

Thaks,

Gary