machining · FF-0550

Why couldn't this 21-stud Flathead be bored past 60 over?

Because the bore would hit the head studs: on a 21-stud block the studs are so close together that they come right against the edge of the cylinder. Ed adds that 80 over pistons are not made, so all eight cylinders were sleeved back to standard.

Expert

Ed Smith

Evidence

expert attributed

Component

cylinder bore limit and sleeves

Applicable scope

1938 Ford Flathead V8, 21-stud, 221 cubic inch, as Ed describes it; the same engine as FF-0420 to FF-0431 at an earlier stage