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From memory I'm thinking book spec for boring the 88 and 96 inch cylinders is + .040 . Going another +.020 may cause some heat dissipation problems although modifying the cylinder oil squirters might solve that . Otherwise I don't know anyone that has done it yet .
I do know that HD had a problem with the cylinder sleeves moving in the big inch SE engines . Don't know if it was an overbore issue or not .
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