The 260 was a 5 bolt bellhousing block and was Industrial Ford Forkleft. The early 289 was 5 bolt as well , till 1965 it changed to 6 bolt for the Ford Mustang. Roots used all the early stuff for the Tigers. If you have a early Tiger you may have got a 2 freeze plug block but most all were 3 from the modified 260 till the end in 1964-65. Boring a 260 to 289 is not real safe! 8)
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