Doug,
The scientific explanation is that your mechanic is full of sh--. The
260 block has the same OD of the cylinder to the water jacket, but a
smaller bore, so the walls are THICKER than a 289. The factory (FORD)
recommendations on boring are a maximum or 0.060 inches on the 260, and
0.040 inches on the 289.
You still have one or two bores left before sleeving should even be considered.
Steve
Doug & Rett Leithauser wrote:
>
> My precious virgin 260 has returned from the highly recommend machine shop
> with boring bar tool marks visible in two cylinder walls. You can feel the
> marks with your fingernail. The cylinders are already 0.030" over.
> I'm about ready to cry.
> The old mechanics tales state that 260s bored over 0.040 tend to overheat.
> Does anyone have any first hand experience with this problem, or have a
> scientific explanation of why this would happen?
>
> Happy Motoring
> Doug Leithauser
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____________________________
Steve Laifman
Editor
<http://www.TigersUnited.com>
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