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Curing L98 Tuned Port Intake Leaks - Stop The Seep



L98 Tuned Port Intake Cold Start Injector
Up to 1988, the L98 used a cold-start injector to richen the fuel ratio, much like a choke on a carbureted engine would. This will have to be removed as well.		 L98 Tuned Port Intake Remove Fuel Injector
Now the fuel injector rails can come out.		 L98 Tuned Port Intake Check Egr Valve
Since the EGR valve is hidden under the plenum, this would be a great time to check it for proper operation with a vacuum gauge. If it will not hold vacuum or doesn't operate when vacuum is applied, replace the valve.
L98 Tuned Port Intake Clean Up Any Coolant
Clean up any coolant, crud, or foreign matter before you start loosening the bolts for the intake.		 L98 Tuned Port Intake Intake Bolts T45 Remove
The intake bolts are T45s. Remove them and carefully pry the intake off the engine.		 L98 Tuned Port Intake Clean Shop Rags Under Intake Runners
Put some clean shop rags in each of the intake runners in the heads, and lay down some rags in the valley area to prevent any debris from getting into the engine. Now you can safely clean the head and block mating surfaces in preparation for the new gasket. Once again, keeping foreign matter from entering the engine is essential. Also, this is a great time to clean up the intake and runners.
L98 Tuned Port Intake Tap All Hols
Tap all the holes and clean the threads on the bolts because all of the intake bolts will need to be coated with Teflon sealant; any old sealant left could result in an improper torque reading.		 L98 Tuned Port Intake Clean Sealing Surfaces
Make sure the sealing surfaces are clean. That includes the bottom side of the intake as well. Use a parts cleaner to remove any grease.		 L98 Tuned Port Intake Fel Pro Gaskets
We used Fel-Pro gaskets (PN MS93318) for the intake. The kit does not come with a new EGR-valve gasket so be sure to get one. We used a silicone gasket from a tube for the intake/block mating surfaces. Be sure that hot oil does not affect the silicone. There is only a five-minute maximum window before the silicone skins over and will need to be redone, so don't put on the silicone until you have the intake ready to go back on.
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L98 Tuned Port Intake Remove Plenum From Runners

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