Using the outline of the original
Chevrolet "shoe" tip rocker arm, the roller was set with the diameter tracing
along the shoe's contact surface, forcing the "axis" of the roller up more than
.300", which forced the TAIL of the rocker arm too high, as its position was not
adjusted for in this error. That .300" equaled more than a 10 degree error, on
an instrument that would only rotate about 24 degrees. This problem lasted for
more than 20 years, and largely continues to this day, even though most top
manufacturers are well aware of the Miller Patent and the consequences for
keeping this error on their original design. Which is way too much extra crank
rotation to open the valve the same amount.
