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Identify Shovelhead cylinders

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Old Yesterday, 03:33 PM
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Default Identify Shovelhead cylinders
Hello all,
Im wondering if someone can assist me, the oem casting numbers at the base of the cylinders/jugs, do the numbers vary from year to year? How do I know if they are a matched pair?
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Old Yesterday, 06:05 PM
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-66 and -78 for 80 inch
 
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Old Today, 01:57 AM
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Originally Posted by johnjzjz
-66 and -78 for 80 inch
Great thanks, do the other identifying numbers change between years? Are any prone to failure more than others? Thanks
 
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