Harley-Davidson Motorcycles

How do you convert a 76 shovel head to 81 CI?

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Wiki User
2011-11-26 23:30:53

If you have a 74 inch engine to start with, you can install 80"

barrels on it but this would bring down the compression so low you

wouldn't be able to ride it. This would be basically the same as

boring out the 74" barrels .060 (IF the 80" barrels are standard

bore!) But your 74ci engine would only be about 76ci. To convert

your 74" to a true 80" you would need to change the flywheels to

gain the additional stroke length. (4.25 for 80" as compared to 3

31/32 for the 74").

emperor norton


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