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Guys , can you help please. Numbers on my carb are 4781-6 which indicates it's an 850 Double Pumper but what what does the 6 indicate?
I have been on the Holley web-site and most numbers go up to 4781-5 but I cant find anything indicating 4781-6?
Any help would be much appreciated, thanks.
 

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6 means that it's the sixth revision of that carb, everytime Holley made a slight change it became a new number. The quality of fuel has changed since they were first introduced and so the calibration sometimes gets changed some or they find improvements in other areas that are made.
 
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