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I have 2 1968 390's one has the C8AE-6312A pulley and the other has the C8AE-6312-B pulley. Both cars are optioned the same with ac, ps, pb but one is a c6 and the other is a top loader. The c6 car is a Hertz G and has the C8AE-6312-B pulley. Is it possible that both pulleys are original to there respective cars? Thanks
 

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Are both crank pulleys triple sheaved, and both cars are S codes?
 

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C8AE 6312-A is the correct pulley. Never seen a -B, what does it look like?

I have 2 1968 390's one has the C8AE-6312A pulley and the other has the C8AE-6312-B pulley. Both cars are optioned the same with ac, ps, pb but one is a c6 and the other is a top loader. The c6 car is a Hertz G and has the C8AE-6312-B pulley. Is it possible that both pulleys are original to there respective cars? Thanks
 

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I'll post a picture tomorrow of a -B pulley. I just got one in with some original smog brackets that were supposed to have come from a 1968 390 engine.
 

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Here is a crank pulley with a C8AE-6312-B casting number. Outer pulley diameteris 7-3/4 inches, and the inner two are 7-1/4 inches.


 

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The -B with the bigger Air Conditioning sheave is for 68 - 70 Galaxie, Monterrey, Parklane, etc.

Here is a crank pulley with a C8AE-6312-B casting number. Outer pulley diameteris 7-3/4 inches, and the inner two are 7-1/4 inches.
 
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