Non dated, non numbered parts as difficult to find as dated?

[Steve D.]

Any body find this to be true?
I have been looking for a radiator 7 blade fan for my 70 350/300 with a/c dated between Jan-Apr. Not having much luck. I understand that. But a radiator support is turning out to be a hen`s tooth hunt. Took my original to a local fab shop and they wanted 600.00 to repair it. The top half is great but the very bottom channel needs work. So that probably is not going to happen. But I cannot find a good condition used one. You would think that a non dated, non numbered part would not be that difficult.
But the hunt continues.

[Michael W.]

Re: Non dated, non numbered parts as difficult to find as dated?

All the originals rusted out just like yours did or were destroyed in front end collisions. That's why they're hard to find. What's wrong with a repro?

[Scott S.]

Re: Non dated, non numbered parts as difficult to find as dated?

Any body find this to be true?
I have been looking for a radiator 7 blade fan for my 70 350/300 with a/c dated between Jan-Apr. Not having much luck. I understand that. But a radiator support is turning out to be a hen`s tooth hunt. Took my original to a local fab shop and they wanted 600.00 to repair it. The top half i great but the very bottom channel needs work. So that pronbably is not going to happen. But I cannot find a good condition used one. You would think that a non dated, non numbered part would not be that difficult.
But the hunt continues.

Steve,

I would check with fellow NCRS member Dave Liukkonen about the radiator fan, he may be able to point you in the right direction. Also, I noticed that LIC has radiator support lower-section (bottom channel) replacement pieces (see LIC #25-40A, 25-40B). They apply to 63-65 and 66-67, but you might check with them to find out if their supplier has a replacement section for your model year, or maybe other vendors carry them.

There is also an article in one of the back issues of Restorer Magazine about making this kind of repair.

[Michael G.]

Re: Non dated, non numbered parts as difficult to find as dated?

Any body find this to be true?
I have been looking for a radiator 7 blade fan for my 70 350/300 with a/c dated between Jan-Apr.

Steve,

You'd be interested to know I was able to purchase through my local Chevy house a new 7 blade fan....approx. 18" +/- in diameter. If your not hooked up on dated their still available.

[Joe L.]

Re: Non dated, non numbered parts as difficult to find as dated?

Steve,

You'd be interested to know I was able to purchase through my local Chevy house a new 7 blade fan....approx. 18" +/- in diameter. If your not hooked up on dated their still available.

Michael------


Not for a 1970. A couple of of the 71+ are still available, though. The pre-71 and 71+ are not interchangeable without changing other parts like waterpump, pullies, and fan clutch.

[Michael G.]

Re: Non dated, non numbered parts as difficult to find as dated?

Michael------


Not for a 1970. A couple of of the 71+ are still available, though. The pre-71 and 71+ are not interchangeable without changing other parts like waterpump, pullies, and fan clutch.

Joe,

I stand by my comment, I've got the fan and it's in use on my '66. What makes the '70 different that the one I've purchased would not be applicable to the '70 .

[Joe L.]

Re: Non dated, non numbered parts as difficult to find as dated?

Joe,

I stand by my comment, I've got the fan and it's in use on my '66. What makes the '70 different that the one I've purchased would not be applicable to the '70 .

Michael------


A 1966 Corvette fan blade assembly will mount exactly the same as a 1970 and is interchangeable. However, there are no 7 blade Corvette fan blade assemblies available from GM for any pre-1971 Corvette. There is a 5 blade fan assembly applicable to some 1960-67 small block Corvettes which is still available from GM. However, its blade count and blade pitch will not provide sufficient cooling for a 1968+ Corvette.

There is one non-Corvette fan blade assembly of 7 blades and 18" OD which might work on a pre-1971 Corvette which is still available from GM. This is GM #393966. While it might work, this fan blade assembly was never cataloged by GM for a Corvette application, either as an original PRODUCTION part or supercessive for SERVICE-only. Is this the one you purchased?

[David L.]

Re: Non dated, non numbered parts as difficult to find as dated?

There is one non-Corvette fan blade assembly of 7 blades and 18" OD which might work on a pre-1971 Corvette which is still available from GM. This is GM #393966. While it might work, this fan blade assembly was never cataloged by GM for a Corvette application, either as an original PRODUCTION part or supercessive for SERVICE-only. Is this the one you purchased?

Joe,

The 393996 7-blade 18" fan (steel blades, 3.25" BC) is a GM fan. It was original equipment on the 1966 Oldsmobile Toronado with A.C., NOTHING ELSE. In May 1972 it was used as a replacement for the 3947772 7-blade 18" fan (aluminum blades, 3.25" BC, 2.25" pitch) that was used on 1969-70 Chevrolets w/AC and 1969-70 Z28's. Early 69 Z28's used fan # 3937779 made by Schwitzer and fan # 3947838 made by Hayes-Albion sometimes stamped "84" (both 2" pitch). Late 69 & 70 Z28's also used fan # 3956684 made by Hayes-Albion (2.25" pitch) and stamped "H", "FRONT", and "94".

Dave

[David L.]

Re: Non dated, non numbered parts as difficult to find as dated?

Steve,

You'd be interested to know I was able to purchase through my local Chevy house a new 7 blade fan....approx. 18" +/- in diameter. If your not hooked up on dated their still available.

The 1970 Corvette 350 w/AC used fan # 3955182 (17 1/2" dia, 7 blades) made by the Schwitzer Company (Schwitzer part # 914166) and has a date code.
The link below is for a 3955182 fan being sold on Ebay (not by me) but it is listed for the wrong models. The 66-67 Corvettes w/427 used fan # 3888366 (stamped "66") that was replaced by fan # 3955182 in April 1971.

http://cgi.ebay.com/ebaymotors/7-Blade-AIR-CONDITIONING-FAN-1-3955182-/120621369892?pt=Vintage_Car_Truck_Parts_Accessories&hash=item1c15980a24

The 1971-1973 Corvettes 350 w/AC used fan # 3991427 (7 blades), discontinued Oct. 1984.

Dave

[Joe L.]

Re: Non dated, non numbered parts as difficult to find as dated?

Joe,

The 393996 7-blade 18" fan (steel blades, 3.25" BC) is a GM fan. It was original equipment on the 1966 Oldsmobile Toronado with A.C., NOTHING ELSE. In May 1972 it was used as a replacement for the 3947772 7-blade 18" fan (aluminum blades, 3.25" BC, 2.25" pitch) that was used on 1969-70 Chevrolets w/AC and 1969-70 Z28's. Early 69 Z28's used fan # 3937779 made by Schwitzer and fan # 3947838 made by Hayes-Albion sometimes stamped "84" (both 2" pitch). Late 69 & 70 Z28's also used fan # 3956684 made by Hayes-Albion (2.25" pitch) and stamped "H", "FRONT", and "94".

Dave

Dave-----


With a 3.25" bolt center, the 393996 would not work for pre-1971 Corvettes unless it was also used with a non-Corvette fan clutch.

I was not sure that the 393996 would work for a pre-1971 Corvette application but it's the only one I could find that even MIGHT work. Apparently not, though.

[David L.]

Re: Non dated, non numbered parts as difficult to find as dated?

Dave-----


With a 3.25" bolt center, the 393996 would not work for pre-1971 Corvettes unless it was also used with a non-Corvette fan clutch.

I was not sure that the 393996 would work for a pre-1971 Corvette application but it's the only one I could find that even MIGHT work. Apparently not, though.

Joe,

I never said the 393996 fan would work on a 70 Corvette. I simply stated what model the 393996 fan was originally used on.

The 3855182 fan has a 3.00" bolt circle. The page below is from my 1972 Corvette Parts Catalog (Sept. 1971).

Dave

[Joe L.]

Re: Non dated, non numbered parts as difficult to find as dated?

Joe,

I never said the 393996 fan would work on a 70 Corvette. I simply stated what model the 393996 fan was originally used on.

The 3855182 fan has a 3.00" bolt circle. The page below is from my 1972 Corvette Parts Catalog (Sept. 1971).

Dave

Dave-----


I was not stating or, even, implying that you said the 393966 would work on a 1970 Corvette. I was simply making clear that, as a result of the information you provided, my supposition that it might work on a 1970 Corvette is to be disregarded.

[David L.]

Re: Non dated, non numbered parts as difficult to find as dated?

Joe,

I believe that the 393996 fan will probably work since the radius is only 1/4" longer (8 3/4" to 9"). A fan-clutch with a 3.25" bolt circle and a hub with open end slots probably could be used to fit on the 70 Corvette water pump hub.

A 1968 Chevrolet-Chevelle-Camaro-Nova w/8cyl. & AC fan, GM # 3931002 (18" dia., 7-alum. blades, 2" pitch, 3.00" bolt circle), probably would be a better fit assuming there was enough clearance (original was 17.5" dia.). The 3931002 fan is also a replacement for the 1966-1967 Corvette w/AC 5-blade 18" dia. fans (GM # 3789562 & 3863137).

Dave

[Joe L.]

Re: Non dated, non numbered parts as difficult to find as dated?

Joe,

I believe that the 393996 fan will probably work since the radius is only 1/4" longer (8 3/4" to 9"). A fan-clutch with a 3.25" bolt circle and a hub with open end slots probably could be used to fit on the 70 Corvette water pump hub.

A 1968 Chevrolet-Chevelle-Camaro-Nova w/8cyl. & AC fan, GM # 3931002 (18" dia., 7-alum. blades, 2" pitch, 3.00" bolt circle), probably would be a better fit assuming there was enough clearance (original was 17.5" dia.). The 3931002 fan is also a replacement for the 1966-1967 Corvette w/AC 5-blade 18" dia. fans (GM # 3789562 & 3863137).

Dave

Dave------


Yes, with other modifications I'm sure the 393996 could be made to work for a 1970. In fact, a lot of other fans could be made to work with other modifications. I was pretty much focusing on what part would be a direct replacement without the need for other modifications.

[John H.]

Re: Non dated, non numbered parts as difficult to find as dated?

Early 69 Z28's used fan # 3937779 made by Schwitzer
Dave

Dave -

I think you meant 3947772.