Hi Dave,
I too have a 66 Mk1A Tiger and 20+ years ago I embarked on an
engine rebuild. The thick-wall-tiger-engine-block story (as told in
Performance Tuning the Sunbeam Tiger) persuaded me to have the block
bored .200 over. I should say here that the machine shop thought me
mad, and that they told me that there would be nothing left of the
cylinders when it was done. They also told me that it would take two
passes to cut that much material, and I paid them to do those two
cuts.
While the block was off at the machine shop, I continued reading
and talking to others (including people at Ford Motorsport) about my
project. I heard all the horror stories (that overbored cylinders
flex, have poor ring sealing, and have a propensity to overheat) and
ultimately I decided not to risk my rebuild on an extreme overbore.
It was the 1980's and nobody near me had a sonic checker with which
the thrust faces of the cylinders could be checked. Estimated
cylinder thickness looking inside the water jacket might have been
.125 (if memory serves), but this was between cylinders and not where
the thrust load of the piston applies.
So I didn't use my original block, and it still sits in my garage
today. Would it hold up under use? I honestly doubt it, I would
not risk using it then or now. The significant point is, it took a
.200 overbore with a good bit of material left. My opinion is that
your .060 overbore will never have an overbore-related problem.
Best regards,
Bob
Bob Burruss
Tiger #382000782
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