Grinding noise during cold startup

[Michael Jez]

Sounds to me like start up clatter. U say it started doing it after the
streets event, well starter dissengages from the flywheel after U let go of
the key, so its not like U overreved the starter with the engine runing too
high of an RPM or something- unless U hold the key in START and bounce off
the revlimiter or something to that nature. If its coming directly from the
cam sprocket area when U start it up, U will need a new tensioner.
Mike Jez