Clutch fans

[Muddytazz]

I haven't had time to look at them yet, but I've got a 7 blade with a bad clutch and a 6 blade with a HD clutch, can I take the 7 blade fan off the bad clutch and bolt it to the 6 blade HD clutch?

 

[k20]

I believe you can.

 

[73k5blazer]

I believe they are physicall interchangable. But if you look in the parts books, there are different ones sized for different engines, fans, etc, transmissions etc. It's a judgement call.

 

[Muddytazz]

I know my 7 bladed fan came stock on my 350/350/203 and the 6 bladed HD came stock on a 400/350/203

 

[pauly383]

Are they semi-rigid , or rigid ?

I used a rigid from another truck thinking I'd get better airflow at all speeds , and ended up rubbing the fan shroud when flexed . Put my original semi-rigid back on and it doesn't rub anymore .

They looked by eye to be the same diameter , and same depth , but was off enough to annoy me .

I believe the rigid was 7 blade , and the semi-rigid was 6 blade . I would have to go home and look .

 

[Muddytazz]

I know my original 7 bladed one stuck out from the motor slight closer to the rad than the 6 bladed one I have on there now.....but I just like the fact of having 7 blades versus 6 blades, thats why I was wondering if I could just swap the blades over.

 

[Muddytazz]

Does anyone know if there are part numbers stamped on the fans and the clutches to do some research?

 

[HarryH3]

The factory original should have a couple of letters printed on it somewhere. They signify how the internals work (when it locks, how long it stays locked, etc.)

 

[Muddytazz]

I was reading somewhere that you shouldn't put a regular duty fan blade on a severe duty or heavy duty clutch due to the fan pitch? How do I tell what is what?

 

[HarryH3]

You probably need to check out a Delco parts book to decode which one you have.

 

[Muddytazz]

Well that bites the big one lol