Fan Clutches 1967 GT350 67 GT350 looks the same as the small block service piece but is stamped with the C7ZX prefix 1967 GT500 67 GT500 engineering number stamped on the clutch should be a C7ZX (assembly line item-not serviced ) This is a example of a NOS Service Replacement part
1968 GT350 GT350 is the small block clutch but with C8ZX 1968 GT500 68GT500 same as the 67 but C8ZX 1968 GT500KR GT500KR could have either C8ZX or the regular Cobra jet number stamping as they were phasing out the use of the "ZX" designation at that time. 1969/70 GT350/GT500 69/70 used the regular production units. I can only assume the ZX units " internally" were rated for higher RPM use or extreme duty, externally they were the same as standard production. The ZX designation usually referred to Shelby production but also was used on limited production " Experimental Items" |
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