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rotorwrench · 05-06-2026, 01:59 PM

The max was .060" back when the castings were good. Most shops stop at .040" over bore due to the liability and that's after a sonic check. These and the early 289 have the different rear bolt pattern that changed for 1966.

05-06-2026, 01:59 PM	#7
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 18,011	Re: Boring a 260 The max was .060" back when the castings were good. Most shops stop at .040" over bore due to the liability and that's after a sonic check. These and the early 289 have the different rear bolt pattern that changed for 1966.