How many gaskets etc in a car

Thank you so much for the
detailed and descriptive  
answer....it definitely helped may I
ask if it is a service bulletin, and
we do not have the
newer/updated ECM would that
be something the dealership pays
for or would we be obligated to
the cost? Plus with this types of
list of non specific gaskets listed
and it is like 30 different ones,
deals non specific, etc does a
chevy even have that many
gaskets and if so when they run a
diagnosis wouldn't codes for
those come up if they are
faulty..thank u again
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