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Any difference in the two different numbers?

Carman24

CB750 Enthusiast
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I have some extra sets of carbs with different numbers. Is there any difference between the two. One set is marked064A the other ones are 657B any help will be appreciated.
 
The should be basically the same. The 064a is off of a 76 750f and the other is one of the most common bodies, fit K's and 75f's Jetting is the main difference. Should be able to use either.
 
Thank you. Just picked up a parts bike, the frame says 750 F but the motor says 750 E. Its supposed to be a 1975. Did they use E motors that year or did someone swap it out?
 
The F means it is a F model bike starting in 75. The motor should be an FE if it is original if it is just E it may be a different motor. If you give me the engine number I can tell you about what year it is.
 
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