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Re: 67 Fan Blades
Thank you David. In answer to your questions...#1. I have not owned my car since new, so it could have been changed. #2. Yes, the other fan is mentioned in the TIM&JG, as well.Leif,
Attached is a photo of a shop drawing of a 3789562 fan taken from Noland Adam's 63-67 Corvette restoration book, Page 118. Clearly the drawing shows 4 rivets per blade. I trust a GM shop drawing much more than what is written in judging manual written in recent times. I also once owned an original 3789562 fan, 18" did., 5 blades, 4 rivets per blade, stamped "H" and "FRONT" on the front and "W" on the back but sold it long ago. Attached is a photo of a 3789562 fan from the web. These fans are hard to find.
Is your fan original to your 67 w/AC? Dome headed (aka, mushroom) rivets were used on 1958-1963 and maybe even 1964 fans. Flat rivets were used from 1965 and later fans. The 66-67 Corvettes w/AC also were issued the 3863137 5-blade 18" fan stamped "912239", "SC", and a date code. Is this in the 7th edition judging manual? I do not have any judging manuals and never will.
The 18" 5-blade GM # 3749576 fans with 5 rivets per blade are as common as white bread. They were used on 1958-1965 passenger cars w/AC , 348, 327, and 409 engines. I will add a photo of a NOS 3749576 in a later post.
Dave
Again, thank you for the explanation and GM original drawing.Leif
'67 Coupe L79, M21, C60, N14, N40, J50, A31, U69, A01, QB1
Top Flight 2017 Lone Star RegionalComment
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Re: 67 Fan Blades
ok i need help. where do you guys find the books that tell you the part numbers and what stamp is where on a part? i looked in the ncrs 6th edition tech manual, and the a.i.m. book. i can not find it. i posted pic's of my fan -above- from my 64 365 hp non a/c car. 5 rivets 4 rivets, w stamp on back, h on the front? i would like to know as i print out a copy of the info and attach it to a pic of the part for my album.Comment
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Re: 67 Fan Blades
@leif anderson. ok it reads 63 and 64 non a/c cars had a five blade fan 17 1/8". with button head rivets in 63 transitioning to flat head rivets in 64. a/c cars in 63 had a non a/c fan. some may have had 18" fans. all 64 a/c cars had 7 blade fans. so i am thinking i have part number 3789562 the 5 blade 18" fan. the book does not state a bigger fan for a high horse engine. i have a 365 hp. could 64's come with ether 17 1/8" for low horse cars and an 18" for high horse cars? by the pic's it's clear the fan i have is 18" and button head rivets. my build date is dec 6th 63.Comment
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Re: 67 Fan Blades
Michael,
IMO, your 18" fan is GM # 3749576 with 5 rivets per blade used on 58-63 Chevrolets, not Corvettes. There are a lot of these 18" 5-blade with 5 rivets per blade being listed on eBay claiming to be for 66-67 Corvettes w/AC. Obviously they are similar but are not "correct". As I said before they are as common as white bread. I have had many of them over the past 40 years. In fact, I have one that has no rust on it and visually looks really nice but somehow it got slightly bend from the vendor that I bought it from many years ago at a swap meet. When placed on a very flat table the defect is then visible.
The hard fans to find are the original 66-67 Corvette w/AC fans, GM # 3789562, stamped "H" (for Hayes-Albion) with 4 rivets per blade as well as the 3863137 fans stamped "912230", "SC", and a date code made by the Schwitzer company. These 2 fans were also used on 66-67 Chevrolet models w/AC.
The 1964 Corvettes were issued the 17 1/8" 5-blade fan or the 7-blade fan for models with AC, nothing else as far as I know.
DaveComment
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Re: 67 Fan Blades
@dave, thank you for your input. like i said the car was hit and the nose replaced. when i got the car it had a 66-67 hood on it. the radiator is stamped 12/65. who ever replaced the nose did do a great job. they spliced it at the bonding strips saving the side louvers. wrong hood, found and bought a 64 hood, wrong rad and overflow, and a 65 grille. the fan is some thing that i can address later. i just started the ground up resto on it. it will be some time before i have to worry about the fan. thanks all for your comments.Comment
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Re: 67 Fan Blades
Michael,
There are no GM part numbers on the fans made before 1968. How you find out this information is to spend 30 to 40 years going to auto swap meets, buying numerous Chevrolet parts catalogs, numerous Chevrolet assembly manuals and other vintage GM literature, going to salvage yards that still have old cars (not these days, however), talking with others that have very original cars, conversing with other die hard Corvette, Camaro, and Chevelle restorers, etc. This takes many years. One has to be addicted to researching parts. I never have owned a judging manual and never will. I rely on many sources to get information about parts. I have about 50 or so Chevrolet parts catalogs and Chevrolet Parts History manuals.
DaveComment
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Re: 67 Fan Blades
Dave,
From your research were the 3789562 and 3863137 fan blades only used on 327 cars with air conditioning or all cars with air conditioning?
Thank you for all work on this topic!
Kind regardsComment
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Re: 67 Fan Blades
Good Morning, I have a 1967 Small Block with AC, PS and Automatic. The car is a Duntov Award recipient. The fan is a five blades with rectangular attachment tabs.
I hope this helps.
Scott SinclairComment
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Re: 67 Fan Blades
Peter,
Those 2 fans were also used on 1964-1967 Chevrolet, Chevelle, Chevry II and 1967 Camaro models with 283, 327 engines w/AC as shown in the assembly manuals and 1964-1967 Chevrolet parts catalogs. The 3863137 fan was not sold over the counter. GM # 3789562 was replaced by GM # 3931002 in May 1972 as per Chevrolet Parts History for service parts sold over the counter. The GM 3931002 fan has 7 aluminum blades and was only issued to 1968 Chevrolet models w/AC but not 1968 Corvettes.
DaveLast edited by David L.; June 3, 2020, 05:08 PM.Comment
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Re: 67 Fan Blades
My 67 # 7471 = 912239 SC L6Comment
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Re: 67 Fan Blades
Thanks DaveComment
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