1971 big block with air fan blade

[Bob Thomas]

Help!! I have been looking for the correct fan blade for a 1971 LS5 454 with air. I know the part number and I know that the fans came date coded. I was looking for this part for several years and could only find one or two by calling many Corvette parts suppliers and looking on the internet. The problem was that they were $500.00 and up and I couldn't stomach that for a fan blade. I finally found one for a decent price at the Winter meet in Kissimmee last Saturday. Awesome show by the way!!! Great job NCRS!!!!

The problem I am having with the part is it is date coded A77 (complete numbers that appear on blade are 914686A77 and part number 3992095 which I believe is the correct part number for a 1971 BB with air)and that seems to indicate that it is for a 1977. Can someone tell me if GM made some kind of replacement fan blade in 1977 for a 1971 big block with air? I have looked in the archives and found no mention of this. Thank you for your help.

Bob

[Joe L.]

Re: 1971 big block with air fan blade

Bob-----

Yes, the GM #3992095 fan blade was manufactured for MANY years following 1971. It was used in PRODUCTION for 1971-73 454 with C-60, so it, obviously, had to be manufactured for the PRODUCTION requirement through the 1973 model year. It was discontinued from SERVICE in October, 1986. So, it was very likely manufactured at least through the early 1980's. This fan blade was not used for other applications----just Corvette. That's one of the reasosn it's hard-to-find. Apparently, the one you found is a SERVICE unit produced in 1977.