Several years ago I had my original tiger 260 block bored to the 289 bore
size. The engine shop did not want to do this, and told me there would be
nothing left once it was done. Obviously there was sufficient material to
bore the engine, but then I was concerned about cylinder wall thickness. I
did not have access to a sonic checker. Measuring in the water jacket
between the cylinders, it looked like the remaining cylinder walls *might*
have been 100 to 120 thousandths. Supposedly the thrust sides of the
cylinders are thicker, but everything is suspect due to core shift unless
you can sonic check it. In the end, I bought a 5 bolt 289 block and went
to .030 over 289 pistons. I still have the machined 260 block in my
garage, but why I am not sure.
--Bob
Bob Burruss
66 Tiger Mk1A #382000782
>All,
>I am looking for anyone's/everyone's experience on rebuilding the original
Ford 260 engine.
>
>Specifically, I want to know how big an over-bore those Ford Industrial
engine blocks can tolerate. I have heard anecdotal stories of thin walls
>causing overheating on over-bores over 0.030", but I have also been told
these blocks are beefier and can go .060" or .080" over. I am NOT
>considering taking it out to the full 4.000" bore of the 289/302.
>
>I am working on a project which, if it proves feasible, will be of great
interest to many Tiger owners wishing to keep their original engine.
>
>Thanks,
>
>Bugz
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