Rick's Free Auto Repair Advice

Exhaust manifold gasket sealer

Exhaust manifold gasket sealer — do you need it?

Should you apply exhaust manifold gasket sealer when replacing an exhaust manifold?

If you’re installing a fiber/metal gasket, install it DRY unless otherwise stated in the gasket instructions. In that case, use the sealer recommended by the gasket makers. Otherwise, just install it and torque to the recommended specification.

Which sealer to use for gasketless exhaust manifold installations?

You’ll need a high-temp RTV rated for exhaust manifold applications.

clean exhaust manifold before gasket

Clean the mating surfaces before using any exhaust manifold gasket makers.

red exhaust manifold gasket sealer

Use Permatex Red Right Stuff gasket maker. Apply gasket maker in 1/8″-1/4″ wide bead. MORE IS NOT BETTER and will cause leaks

Permatex The Right Stuff Red

Both the 1-minute and 90 -minute versions are high temperature gasket makers rated up to 650°F (intermittent). Recommended applications: Header, Manifold, Slip-Fit Exhaust Parts, Turbocharges

Permatex Red The Right Stuff Red 1 Minute

Permatex The Right Stuff Red 1- Minute RTV Gasket Permatex The Right Stuff Red gasket makerMaker can be used as a gasket maker in high temperature applications. The 1-minute version in an aerosol can is the only high temperature gasket that allows you to apply, torque and return to service right away.

Permatex Red The Right Stuff Red 90 Minute

Permatex The Right Stuff Red 90 Minute is available in a tube and Permatex The Right Stuff Red 90-minute gasket makercures in 90-minutes. Apply, assemble, and hand tighten. Let it sit for an hour. Then torque to full spec.

Permatex Ultra Copper Gasket Maker

Permatex Ultra Copper Gasket Maker can be used for exhaust manifolds/headers, turbo charger applications, and slip-fit exhaust parts. It’s Permatex Ultra Copper gasket makerrated for -65°F to 700°F (-54°C to 371°C) intermittent and resists auto and shop fluids and vibration.

For best results, clean and dry all surfaces with a residue-free solvent, such as Permatex® Brake & Parts Cleaner.

Cut nozzle to produce a bead 1/16″ to 1/4″ width.

Apply a continuous even bead to one surface, surrounding all bolt holes. Remove excess with knife at once. Assemble parts immediately. Do not squeeze out silicone by over tightening bolts. Re-torque will not be necessary.

Dries in 1 hour, and fully cures in 24 hours, at 70˚F (21˚C) – 50% relative humidity.

Allow more time in cold weather.


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©, 2021 Rick Muscoplat

Posted on by Rick Muscoplat

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