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Not quite the same block. Boring out the 260 to a 4 inch bore would leave the sleeves perilously thin. You need a 289 block. Their sleeves are thicker
Paul
1965 Mustang 2+2
1989 Mustang GT Convertible
MCA #27261
MCA certified judge for 65's and late models
Paul
1965 Mustang 2+2
1989 Mustang GT Convertible
MCA #27261
MCA certified judge for 65's and late models