It shouldn't need to be as accurate as that. The base circle *should* exist
for a minimum of 180 degrees at the heel, and probably slightly more than
that. Which means that anywhere in that 180 degrees *should* give the same,
maximum clearance. But as individual cams will show, the greatest clearance
can exist over a much smaller rotational angle than that, and in any
position. It's that you need to find, on your cam, and adjust to.
http://www.lunatipower.com/Images/Tech/Cams/AnnotatedCamLobeLarge.gif
PaulH.
----- Original Message -----
> The crane cams method just about guarantees that the lifter for
> the valve you are adjusting is resting on the base circle:
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