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#11
07-03-2002, 05:45 PM
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Re: 69 L78 Nova Fan
There are two part numbers for the L-78 fan listed in the 1969 AIM. The first fan, part number 3947128 (later superceded by part number 6270076) was a four blade unit having an 18" diameter and did not utilize a fan clutch. The second fan, 3939001, (part number also superceded and became 3990936) is listed as a five blade unit with an 18" diameter and again, did not use a fan clutch. I don't have the AIM handy, but if someone would check, I believe that the revision on the sheet shows approximately April, 1969. Remember that the revision date listed in the AIM was when the document was updated (not when the actual change was made), but the actual production line change would most likely have been close to this date.
Regards, Stan Falenski 
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#12
11-01-2018, 12:23 AM
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Early L78 Nova fan
Hi I am working on my 69 Nova l78 that was built October 1968. From my research I see that it takes the 4 blade fan (which I now have) part# 3947128. I thought I needed the one inch spacer but now that I'm assembling everything the fan is so close to the radiator the one inch spacer will not work. Can anybody tell me if there was supposed to be a spacer with the 4 blade fan. Thanks
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#13
11-01-2018, 01:42 AM
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69 L78 Nova...
Contrary to all the repro catalogs and other mis-information; the L78 and L34 came with a staggered 5 blade fan...there was never a spacer. I understand the references to AIM info...but, I have never seen or heard of a factory 4 blade on any big block car. happy to be shown different..
-wilma  Quote:
__________________
02 Berger 380hp #95 Lots of L78 Novas Join National Nostalgic Nova! 70 Orange Cooler 69 Camaro
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#15
11-01-2018, 11:19 AM
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5 blade fan...
Both engines used the same fan...these fans were notorious for the noise they made as the rpm's went up...most of them were replaced back in the day with a flex fan. Interesting thing is, they actually worked pretty well at cooling the BB motors.
Again, there is a lot of stuff out there about what fan is correct...based on all the info I have seen, including survivor cars, there was never a 4 blade on these engines. -wilma Quote:
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02 Berger 380hp #95 Lots of L78 Novas Join National Nostalgic Nova! 70 Orange Cooler 69 Camaro
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#16
11-01-2018, 02:48 PM
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I'm with Tom, in all my years I've never once seen a 4 blade fan on either the L34 or L78 Novas.
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Marlin 70 Yenko Nova-350/360, 4speed M21, 4.10 Posi (Daddy's Ride) 69 SS Nova-396/375hp, 4speed M20, 3.55 Posi (Benjamin's Ride) 67 RS Camaro-327/250hp, 2speed Glide, & 3.08 Open (Danny's Ride)
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#18
11-01-2018, 10:48 PM
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Does anybody out there have an original early build 69 l78 Nova? Sure would be nice too see what an original car had.
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#19
11-02-2018, 10:33 AM
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Its definitely a 5 Blade, non clutch(there was no room for one).
__________________
70 L78 Nova Fathom Blue,Bench, 4spd, F41, 3:55 71 Porsche 911 Targa
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#20
11-02-2018, 04:26 PM
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Not a 69, but some looks at an original 1970 if that helps.
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