Re: CV vs. CZ fan clutches and their applications
Mike your LS6 buildsheet answers your 3976064 and CV clutch application question. The W in box 21 is the code for the 064 fan and of course it lists the CV clutch. This is the only clutch used on shp big blocks in 1970. L78's use 772 fans and use code V as it's identification code. I do not have any evidence supporting the use of a 772 fan on an LS6. All my documentation lists either the W code or just 64 depending on plant code usage for an LS6 car regardless of whether it has 3.31 or 4.10 axle.
My research on other applications agrees with your findings, 69 Z28 Camaro, 69 L78 and L72 Chevelle as well as the above listed 70 applications. Not used on 69 shp big block Camaro or Nova.
Chris
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