70 seven blade fan

[Tom L.]

Re: 70 seven blade fan

Justin, the fan you're loOking for is a one year piece. '71 and on has a different arrangement for mounting to the fan clutch. I only know because I bought the wrong fan for my '72. Long story short, I was able to get a fan bent like yours. I was able to straighten the tips fairly easily and there were no signs of stress cracking once I completed the repair. If you move forward or are interested in pics and the process I used let me know. Good luck!!

[Jim T.]

Re: 70 seven blade fan

Just counted the number of blades on my 1970 July built 350/300 with factory air conditioning. Fan is original factory installed fan and still mounted to original fan clutch. 5 blades and they are not evenly spaced.

[Joe L.]

Re: 70 seven blade fan

Just counted the number of blades on my 1970 July built 350/300 with factory air conditioning. Fan is original factory installed fan and still mounted to original fan clutch. 5 blades and they are not evenly spaced.

Jim-----

That fan would be a GM #3888366.

[Tom L.]

Re: 70 seven blade fan

Hi, got an e-mail notification about a PM from "James" but the PM never arrived. Try again and I'll get the info to you.

[Clark E.]

Re: 70 seven blade fan

Hi Jim...I'm interested in your comment regarding your 1970 w/air and the fact that it has a 5 blade fan. I also have a 1970 March built 350/300 w/air and it too has a 5 blade fan. I've owned the car since 1972 and believe it to be the original fan. How does this mesh w/ the JM's contention that all 350's w/ air had 7 blade fans? Thanks...Clark

[Jim T.]

Re: 70 seven blade fan

Hi Jim...I'm interested in your comment regarding your 1970 w/air and the fact that it has a 5 blade fan. I also have a 1970 March built 350/300 w/air and it too has a 5 blade fan. I've owned the car since 1972 and believe it to be the original fan. How does this mesh w/ the JM's contention that all 350's w/ air had 7 blade fans? Thanks...Clark

Clark with your 1970 having a 5 blade fan like my original owner 1970 350/300 with factory air I would be interested in a original owner of 1970 posting that he has 1970 with a 7 blade fan. My 1970 was built in July 1970. My 5 blade fan is all steel.

[David L.]

Re: 70 seven blade fan

The 1970 Corvette AIM lists fan # 3955182 for models with the 350 engine and AC (UPC C60, sheet C1). Even though the drawing shows a 5 blade fan the 3955182 fan actually has 7 blades and is and is made by the Schwitzer Company (SC part # 914166). The GM and SC parts numbers as well as a date code are stamped on the fan.
It's always possible that there was a temporarily shortage of 7-blade fans on the assembly line and they substituted the 5-blade fan (GM # 3888366).

The 1970 Corvette AIM lists fan # 3993889 (was 3969926 4-24-70) for models with the 454 engine and AC (UPC C60, sheet C2).

Dave

[Bob I.]

Re: 70 seven blade fan

Does the fan look like the one in the photo below?

David
I have a fan, similar to the photo. With a date code of K7. Looks like I need to find an(L46,C60) original for a F06
Bob

[David L.]

Re: 70 seven blade fan

David
I have a fan, similar to the photo. With a date code of K7. Looks like I need to find an(L46,C60) original for a F06
Bob

Bob,
The 7-blade fan in my photo is GM # 3931002 (Schwitzer # 914033, 18" dia., 3.00 bolt circle). It is an assembly line fan only for 1968 Chevrolet V8 models (exc. Corvette) w/AC as well as a replacement fan in later years for other models. Your fan is dated Oct. 1967 ("K7").
Dave

[Bob I.]

Re: 70 seven blade fan

I'm looking for a fan blade 3955182
I found one with a date code (00047)
Could I get help with the date code
Thanks Bob

[David L.]

Re: 70 seven blade fan

I'm looking for a fan blade 3955182
I found one with a date code (00047)
Could I get help with the date code
Thanks Bob

Bob,

The 3955182 fan was made by the Schwitzer Company (SC part # 914166) and original equipment on 69 Corvettes 427 w/AC and 70 Corvettes 350 w/AC as far as I know. The fan also appears in my 1981 Corvettes Parts Catalog as a service replacement for the 3888366 5-blade fan (66-67 Corvettes w/427 and 68-70 Corvettes). I have never seen a date code similar to "00047" on a Schwitzer fan. I have seen the 3955182 fans dated as late as March 1988 ("C 88").

Dave

[Clark E.]

Re: 70 seven blade fan

Jim...I pulled my 5 blade fan and clutch in an attempt to further identify what equipment came on my '70. The blades like yours are steel and I believe from the information in the AIM the part # is 3888366 although no part # or date code appear on the fan. The center has a "H" and the word "FRONT" along with a "99" all stamped on the bolt ring which has 3'' between opposite bolt hole centers. On the other side one of the blade supports has a "W" stamped on it. The fan has a 17 1/8 diameter. There are no other markings. The blades are held to the supports by 5 flat head rivets that form a "T" on each support. The blades are not uniformly positioned around the center.The flange edge on the clutch that bolts to the pulley has the date of 1 17 69 followed by "SC" for the mfgr. This concerns me as the car was assembled 3 23 70 and 14 months is a huge span of time for a part to move through to the assembly line. As we have a similar issue (5 blade fan on a 350/300 w/air) I'd like to know what information your fan and clutch have. The date on the clutch is easy to see (provided the engine is turned over) as is the "W" on the blade support that faces the engine. The other markings on the front will require a mirror. Maybe we can solve this issue together and as Dave suggested it may just be an assembly line substitution. Many thanks...Clark

[Gary H.]

Re: 70 seven blade fan

My July 69 427/390 AC car has a 3955182 fan. Pics attached. Gary

http://imageshack.us/photo/my-images/854/lhbs.jpg/

[David L.]

Re: 70 seven blade fan

Clark,

Your fan is stamped "66" (not "99"). The "66" is part of the Hayes-Albion part number (the manufacturer). It is a 17 1/2" dia. fan. The measurement from the center hub hole to the tip of any blade should be 8 3/4" (the radius X 2 = the 17 1/2" dia.). This fan was original equipment on 1966-1967 Corvettes w/427 and 1968-1970 Corvettes w/350.

You fan-clutch was made by the Scwitzer Company ("SC" stamping) and is dated Jan. 17, 1969, which does seem much too early for your March 1970 car. Is the diameter of the fan-clutch 6" or 7 1/4"? Is there a 2-letter ink stamping on the face of the fan-clutch?

Dave

[Dino L.]

Re: 70 seven blade fan

I had a low mileage unrestored original 1970 base motor with AC, which had a 5 blade and judging guide stated 7 giving points deductions.....the assembly was never touched from the factory it was June car