COPO fan clutch problem - The Supercar Registry

08-14-2007, 05:34 AM

Steve Shauger Steve Shauger is offline

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Re: COPO fan clutch problem

Big block used different clutches from small blocks. The shafts are indeed shorter to accomodate (fan/radiator) clearance for the AC equipped 396 cars and COPO's which both used 4 core radiators. Copo's/L78 used part number 3946050 (stamped CZ)
and L35/34 used the 3946050. I believe the difference between the two had to do with the ability for the clutch to withstand high rpm operation.

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