1977 K15 fan blade

[PghFamilyMAN]

Done a lot of searching and cannot seem to locate exactly what fan should be on this truck. PO put a new 350 crate motor in it with a non clutch 4 blade fan on it. I ordered the sever duty Hayden clutch for it, but can't seem to find the correct fan now. Does anyone have a part number or website where I can get one? Also been searching salvage yards but without any luck. Thanks in advance!

 

[Rusty Nail]

Gm # 3991431

Hi! I found this on eBay and thought you might like it! Check it out now: http://r.ebay.com/Zhjy6Q

You're welcome in advance.

 

[PghFamilyMAN]

Gm # 3991431

Hi! I found this on eBay and thought you might like it! Check it out now: http://r.ebay.com/Zhjy6Q

You're welcome in advance.

Thanks, but from what I've read on here and other forums, people are saying to stay away from those. Do you have any knowledge on these?

 

[Rusty Nail]

It's a stock replacement? That's all I know.
Well, there are 17, 18, and 19 inch versions available?
Heres a different brand as example if you dont like the name Flex a Lite

Hi! I found this on eBay and thought you might like it! Check it out now: http://r.ebay.com/A4eFL6

severe duty? Eww.

http://www.haydenauto.com/featured products-fan clutches and fan blades/content.aspx

 

[75gmck25]

My '75 GMC has the HD cooling option. I am using a Hayden SD fan clutch and a 7 bladed steel OEM fan. I would have to measure it to know the exact diameter. You should be able to measure the inside of your fan shroud and subtract about 2" to get the fan diameter (that gives you an inch of space around the edge).

With the SD clutch and steel fan I could probably let the truck idle all day and it would never overheat. I am also using a Stewart Stage 1 high flow water pump and a 195 degree high flow thermostat.

Bruce

 

[austinado16]

It's a stock replacement? That's all I know.
Well, there are 17, 18, and 19 inch versions available?
Heres a different brand as example if you dont like the name Flex a Lite

Hi! I found this on eBay and thought you might like it! Check it out now: http://r.ebay.com/A4eFL6

severe duty? Eww.

http://www.haydenauto.com/featured products-fan clutches and fan blades/content.aspx

Thanks for the link to the Hayden info page. Just ordered the reverse rotation, severe duty version from RockAuto...it'll be here tomorrow.

 

[Rusty Nail]

Word.

 

[austinado16]

Installed the new Hayden severe duty clutch yesterday. Comparing it to the OEM one, it has much thinner cooling fins on the front face. The cold start "roar" goes away after only about a 1/4mi of driving. I seem to remember my old (new) OEM clutch roaring for a mile after cold start. It'll be interesting to see how this performs during the heat of towing this summer, and how long it lasts. Nice to see it was stamped: "Made in USA."