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Welcome to EGRless land.
In 1992 the L27 motor did NOT have an EGR valve since...well not many cars that big get 31mpg on the highway...
Actually the motor ran clean enough and was efficent enough that an EGR valve was not needed to pass emmisions testing.
Note: since they did not use an EGR valve you may have other issues with burned exhaust valves but there are MANY 1992 bonenvilles/olds/buicks that have made it over 300K without any problems on orginal engine and trans.
In 1993 GM realized the problems and put the valve back on.
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