because the compression release has more than .005" of lift on the exhaust valve.
thats how.
the compression release is a spring loaded nub on a pivot point connected to counter weights on the camshaft. when the motor reaches a low rpm, the compression release and its aforementioned counter weights allow it to move out of the way via centrifugal force from the lifter.
pull the valve cover off, pull the spark plug wire off, and gently pull start the motor. you will see the exhaust valve slightly open when pull starting it on the compression stroke. you will be able to visibly see that it moves more than .005".
i went into my garage just now and did a very quick and inaccurate eye ball measurement with my digital mitutoyu calipers. .135" was what a quickly saw. again, not accurate at all, but a quick eyeball job with them. so as you see, .135" of lift is a touch more than the .005" valve lash you quoted.
:thumbsup: