Correct Clutch Fans for LS-6?

[Rick Cell]

Documented with build sheet and has the original fan.

[Rixls6]

Maybe Rick Nelson can shed some light on this. It's the first one I've heard of built that way.

[Rick Cell]

Rick the fan is dated Dec 69. My car is an April build.

[slimsls6]

my unrestored ls6 has 3:31 gears and was built in kansas at leeds plant has the 064 fan

[Ls6 Ragtop]

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

[Rick Cell]

Chris thanks for clearing this up.

[Rixls6]

Thanks Chris, learn something all the time.