'65 fan assembly rivets for part no. 3770529

[Tony S.]

Can someone please describe the correct rivet used for the '65 non-a/c small block fan (part no. 3770529)? I've read about both mushroom heads and flat heads. Thanks in advance.

[Rick S.]

Re: '65 fan assembly rivets for part no. 3770529

Anthony,
Here is a photo of my small block non-AC fan and I believe these are called flat rivets. Not sure if it helps you due to it being a 67 fan.

Rick

[David L.]

Re: '65 fan assembly rivets for part no. 3770529

As far as I know the 64 and older fans have domed (or mushroom) heads. I know the 66 and 67 fans have flat rivet heads. I believe the 65 fans have flat rivet heads as well but I not 100% sure.

[Tony S.]

Re: '65 fan assembly rivets for part no. 3770529

The '64 JG indicates that during the '64 model year, the fan transitioned from rounded to flat rivet heads. In one place the '65 JG indicates rounded heads but the '65 L78 fan has flat rivets. I've seen in other posts that later C2 fans, part no. 3770529, have flat rivet heads.

I hope some owners of original '65 small block (non-a/c) cars will chime in.

Thanks.
Tony

[Peter L.]

Re: '65 fan assembly rivets for part no. 3770529

Tony - Flat "button" head. Pete

[John L.]

Re: '65 fan assembly rivets for part no. 3770529

Anthony
My '65 small block, non A/C, fan looks the same as pictured by Rick. The front heads of the rivets are flat and smooth, and the HEADS are 5/16 dia, about 1/16 thk. The picture I believe, shows the end of the rivet peened

[Wayne M.]

Re: '65 fan assembly rivets for part no. 3770529

Anthony,
Here is a photo of my small block non-AC fan and I believe these are called flat rivets. Not sure if it helps you due to it being a 67 fan.

Rick; others. I've never seen a small block fan with the "W" stamped on the back of the spider (but I don't get out much ). I know it's on the '66 BB fan. Is this a manufacturer's logo, or a code for the blade angles ?

[David L.]

Re: '65 fan assembly rivets for part no. 3770529

Rick; others. I've never seen a small block fan with the "W" stamped on the back of the spider (but I don't get out much ). I know it's on the '66 BB fan. Is this a manufacturer's logo, or a code for the blade angles ?

My original 66 Corvette 17 1/8" dia. 5-blade fan has the letter "H" (for Hayes-Albion) stamped on the front and the letter "W" stamped on the back side. I know the fan is original as it was attached to a Scwitzer 6" dia. fan-clutch stamped "SC 1-26-66" (Jan. 26, 1966). I bought the car in 1979. I also have about 40 to 50 5-blade and 7-blade fans from the 60's and early 70's and most (if not all, I would have to check) of the Hayes-Albion fans have the "W" stamped on the back side and most have the word "FRONT" as well as the letter "H" stamped on the front. I do not what the letter "W" represents.

[Peter L.]

Re: '65 fan assembly rivets for part no. 3770529

Wayne - You just have to get out more and look at some of those non-AC small block 65-67 fan blade assemblies The original production ones I've seen have had the "W", although I'm sure the stamping process was not "perfect." I can't speak to the older SERVICE fan blade assemblies but the current p/n 3770529 fan blade assemblies do not have he "W" stamped on the back of one of the support arms. Pete

[Wayne M.]

Re: '65 fan assembly rivets for part no. 3770529

Wayne - You just have to get out more and look at some of those non-AC small block 65-67 fan blade assemblies The original production ones I've seen have had the "W", although I'm sure the stamping process was not "perfect." I can't speak to the older SERVICE fan blade assemblies but the current p/n 3770529 fan blade assemblies do not have he "W" stamped on the back of one of the support arms. Pete

Hi Pete - It's been a while since I owned a non-air 327, and anyway, I wasn't looking for "W"'s back then . but here's both sides of a '529' off either a '64 VIN 8xxx or a '65 VIN 10xxx [bought some parts off a local; he and his son were doing mild resto-rod conversions on their two cars].

Go down to the two thumbnail pics located below the 2 auto-load shots of the 7-blade air fan.

I wire-brushed both sides to expose any stampings -- no 'W'; just the 'H' on the front (not "FRONT'). I'm pretty certain that this is an original factory piece. You'd think the 'W' would be mentioned in the '65 TIM&JG; it's such an easy mark to see. The Sweitzer-type clutch that came with this had no 'SC' or date stamp on the flange, so I guess that places it before EOP 1965.

2nd fan topic: Rivets . Pics show the mushroom head types. Remember I've said that this 5-blade fan is off a '64 or a '65. I understand the new '63-4 manual calls for flat button head types on '529's starting sometime during the '64 MY. This conflicts with the '65 manual which says mushroom typical on all fans (except for 396, which is mentioned in their next para.).

Just for fun, I've thrown in 2 pics of my 7-blade C60 fan ('64 or '65) with just FOUR rivets. Trivia: the rivet head diameter on this fan is 0.39", versus 0.34" on the '529'.

[Peter L.]

Re: '65 fan assembly rivets for part no. 3770529

Wayne - Great pictures. Just because you and I know things changed in production and not all items are exactly like what's on our cars (some judges tend to forget that), I'm looking at the C60 7 blade fan blade assembly I have (it's an orphan) that has the flat "button" head rivets and it has the "H" stamped on the front of the support hub (like yours) along with a "6" or a "9." In addition it has a "W" stamped on the back of one of the support arms. Pete

P.S. You still need to get out more because maybe the early version of the 3770529 fan blade assembly with the round "mushroom" head rivets didn't have the "W" stamped on the back. Somebody needs to check!!