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#11
02-11-2008, 01:53 AM
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Re: Correct Clutch Fans for LS-6?
This is pretty easy question to explain. LS6 cars all received a seven blade HD fan coded with a W or a 64 on the buildsheet. There is no difference regarding gear ratio for the fan application meaning regardless of the car receiving the 4.10 option or one of the two 3.31 rears, all cars would still get the 3976064 fan blade. If you have a buildsheet for your car, box # 21 will give you the information for the fan and clutch assembly. Depending on plant, the codes will read W CV or 64 CV . The W and the 64 denotes the 064 fan, the CV is the Eaton fan clutch code.
Regarding identifying the fan blade, there are 2 versions of the 064 fan supplied to the assembly plants. Both blade designs are virtually identical except in the manner that the blades are attached to the hub. Dated versions use a square pattern 4 rivet pattern while the undated version is more of a triangular pattern with a corresponding recess that matches the hub design. These fans are different than the 772 fans in that the blade is squared off with multiple notches versus the 772 fans having a gentle curve to the end of the blade. If you were to prove you indeed had a car built with a 772 fan, the code in box 21 would need to be a V instead of a W which I personnaly have never seen. Regarding dated fans versus non dated, my experience has been that most cars received an undated version from the factory. Only 2 dates of dated 064 fans ever surface, M69 for Dec 69 and E70 for May of 70. Chris 
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#13
02-11-2008, 03:55 AM
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Re: Correct Clutch Fans for LS-6?
Thanks Chris, learn something all the time.
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Rick 69 Chevelle SS396 Silver L78 M21 Post Sedan (Berger Chev.) 69 Chevelle SS396 Black L78 4-speed 4.10 Post Sedan  Don't text and drive. Somebody's life may depend on it!
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#14
02-11-2008, 05:20 AM
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Re: Correct Clutch Fans for LS-6?
Great Info Chris !!!You guys are amazing !
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Lately into Beaumont SD's, 66,67,68 and 69 , including a 69 2 Dr Post Beaumont , an L78 2 Dr Post Chevelle LS6 Chevelle's, LS6 and L78 El Camino and Camaro fan ! Also 2 Cdn Documented COPO's, a COPO Camaro and COPO Chevelle Love GM Products
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#15
03-04-2008, 08:27 PM
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Re: Correct Clutch Fans for LS-6?
05D Arlington car with M-40 & 4.10.
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Don't mistake education for intelligence. I worked with educated people. I socialize with intelligent people.
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#16
03-04-2008, 09:09 PM
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Re: Correct Clutch Fans for LS-6?
I've found the #6064 fan was also used during 1971 on the LT-1 Camaro,LS-5 Monte C.,and the 402cid Camaro-Monte Carlos that came with Air Conditioning.
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#18
03-13-2008, 03:15 AM
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Re: Correct Clutch Fans for LS-6?
Is this the "064" fan? It has the same # (914390)that preceeds the date code, and it looks identical, although dated B75...probaly just an over the counter replacement, or did GM use the same fan for different applications after 1970?
http://imagehost.vendio.com/a/358018...w/IMG_4200.jpg http://imagehost.vendio.com/a/358018...w/IMG_4201.jpg http://imagehost.vendio.com/a/358018...w/IMG_4202.jpg
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