Working on my daughter's 1995 Olds Ciera w/ a 3.1 V-6. Cleaned clogged passageway from EGR to throat of plenum A.O.K.Time now to reinstall. GM Service Manual states that RTV sealant should be used (there was none on tear down and everything appeared to be factory..85k on odometer.)"on each ridge where the front and rear of the intake(and this IS the upper intake to which the text is referring) contact the cylinder head" My question is where might they be talking about applying sealant as technically the plenum & gasket do not contact the cylinder head , but only the lower intake ? Moreover , I do not see a "ridge" at all on these two very flat surfaces ! Any help would be greatly appreciated.