My 69 has a 4 core curved neck radiator. The 427 has a non-clutch fan on it now. I want to go to a clutch setup. Anyone know the part number for the right clutch? I had one laying around for my 68 Chevelle and the clutch was too close to the radiator, even though the clutch itself had a fairly short shaft. looking for part number for either over-the-counter parts store or GM. Not as worried about numbers matching as I am on functionality. TIA for any replies

I would use one of the new fangled Derale heavy duty series flex fan. These always work and provide more air at slow engine speeds, take less hp at higher rpms than the clutch models, and look cool has heck in chrome and stainess. You can use up to an 18" with your shroud and use a spacer to tune the fan into the shroud.

http://www.derale.com/img/ChromeHDFlexFan.jpg

I recently converted one of my friends 69BB with air that had a clutch style fan (he was overheating here in Hotlanta!) to one of these and it took care of the problem immediately. I also run one on my 69 ragtop with air, over 400+hp in Hotlanta too and it cools great!

Check out http://www.derale.com/flexfans.shtml and ONLY use the 17XXX part number series available from Summit Racing.

Those fans are too noisy for my taste. I want a clutch fan. Thanks for responding. Does you buddy still have the clutch? Would it be possible to get the part number off of it?

Actually ACe these fans hardly make any noise! I cannot hear mine on my 69 spinning at 6000rpms! That's the beauty of them.

The clutch assembly my friend took off he is keeping.

IMO The problem with clutches, especially these days with lots of aftermarket suppliers and manufacturers (they are NOT made by the OEM anymore obviously), is that you do not know if they are working correctly and everybody offers a "universal" model moreover for your application when GM had over 50 different ones in 1970? Different applications for trucks, heavy duty use, air, performance, standard, transmission types, rear end gears and engine size all played a part in specifying the correct range of thermal coupling, fan size and performance. I have tested these clutched fans on dynos to tell you that they are very inconsistent in behavior and eat up hp pronto (http://carnut.com/ramblin/dyno.html).

Just more information than you probably wanted. If you are still in the mood for a clutch and fan, check out YearONe out of Atlanta. They have the best variety of such.

Jeff, I bought a fan clutch this past Tuesday, which was ordered by the local Pontiac DEaler. It was a DELCO. I ordered a fan clutch for a smallblock (350 with air) The part number is 22050676. List price is $122.88. My nephew works in parts and it cost me 59.07 tax included. Jack

Thanks for the input guys, been busy on my chevelle SS putting in a 4.10 12 bolt, linelock, chrome power brake booster/new master cylinder and new front bumper. Camaro has drop down the list. Thanks for the part numbers and such and I'll be looking into your suggestions. smile.gif