L78 Nova fan noise.
 

I have a 70 Nova L78 that is all stock and sounds normal. I have had a number of L78 Novas and a few of of them had quite a loud howl that sounded like a truck. I didn't think there was anything wrong and never really searched to see where it comes from. This car I have now has what looks to me to be a stock shroud and 5 blade fan with no thermal clutch. It runs great and I sort of miss that howl. I have never heard the same sound from any other Camaro or Chevelle with a L78.

5 Blade Nova BB Fan...
 

The 'howl' as you call it is standard equipment for these fans...they all do it.

Back in the day the noise was the reason a lot guys went with a flex-a-lite unit...the noise got to them.

No need to worry...if folks ask about the noise, just tell them you have a mini-blower installed and don't open the hood :naughty:

-wilma

Thanks.The problem is mine doesn't do it.Do all L78s use a 5 blade fan?

Fan noise
 

Tom
Why do L-78 novas have the fixed blade only and all other L-78 models have fan clutches???
Thanks in advance
Mike

Because there's no room for it between the water pump and the radiator,like other vehicles that used a fan clutch.
The 7 bladed fans use the clutch and it needs more space.

5 Blade Nova BB Fan...
 

As noted, the space is the issue...the first year of the big block Nova [1968] used the short water pump with a clutch and 5 blade fan...that was the only year for that setup.

And despite what the 'repop catalog' guys show on their websites, there was never a spacer between the fan and water pump on the 69-70 cars. As for the lack of noise...?? hard to answer that one...maybe post a photo of the fan blade so we can see what you got.

There are several GM versions of those 5 blade heavy metal non-flex fans. Some have more of an aggressive pitch than others, that were installed on 70-72 small and big block trucks. Someone might have put one of those on, trying to pass it off as the correct fan (you have to look close at them).

Here are some pics.Hard to really get good ones.

https://www.kijiji.ca/v-view-details...dId=1460372449

Looks like a painted flex fan.
The blades don't look correct at all
Just my 2 cents

fan not correct in my opinion.