You need to replace the manifold and use Felpro Gaskets.
Intake manifold gasket leak....big problem with that engine. Sorry for the bad news.
It cost us about $700 cnd. That was a shop that charged about $75/hr.
under the intake manifold you have to remove the engine cover to get to it.
Intake manifold torque specifications for the Olds 403 is listed as 30 ft-lbs.
What are the intake manifold torque specs on 1998 Oldsmobile bravada?"
replace lower intake
it is located inside the intake manifold
Right where the intake hose attaches to the engine, between the bellowed tube and the intake manifold thing.
The intake manifold is where the air and fuel mix and enter the engine. The exhaust manifold is where unspent gas and air exit the engine. In other words the intake manifold is where the engine breathes in and the exhaust manifold is how the engine exhales out.
The starter on this car is located under the intake manifold, in the engine valley. Tech JK -------------
attached to the engine near the flywheel You have to go under the car. toward the back of the engine.
Intake manifold gasket seems to go on every single van, anywhere between 60k and 150k. This van has a host of cooling/transmission issues.