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 The first fan, part number 3947128 (later superceded by part number 6270076) was a four blade unit having an 18" diameter and did not utilize a fan clutch. The second fan, 3939001, (part number also superceded and became 3990936) is listed as a five blade unit with an 18" diameter and again, did not use a fan clutch.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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