exhaust gasket sealer
 

Any suggestion to a HI TEMP sealer between an alluminum exhaust manifold and a rough cast iron head exhaust port.
While changing starbord engine outside manifold & gasket, I noticed some rust corrosion at the exhaust port perimeters (2 middle ports) sealing surface on the head. I cleaned up with wire wheel on dremel, but it is quite rough and concerned about sealing.
Santa may bring me some new head (s) in January but for now I want to get a bit more boating while the weather is still clear so a temp fix is the need.

Is there a exhaust (form-a-gasket) sealers out there that will withstand exhaust temps?
Thanks

Re: exhaust gasket sealer
 

This is what I use with the gasket and have no leaks or problems.

PERMATEX ULTRA COPPER Hi-Temp RTV Silicone Gasket Maker

PERMATEX ULTRA COPPER ® Hi-Temp RTV Silicone Gasket Maker
For turbocharged or high-performance engines. The most advanced, high temperature RTV silicone gasket available. Sensor-safe, low odor, non-corrosive. Superior adhesion. Three times more oil resistant than conventional silicones; eight times more flexible than cut gaskets. Temperature range -75°F to 700°F intermittent; resists auto and shop fluids and vibration.

Suggested Applications:
Exhaust manifolds/headers, valve covers, oil pans, timing covers, water pumps, thermostat housings
Part# 81878 3.0 oz. $3.89

Re: exhaust gasket sealer
 

Thank you Scott...


off to the store :drink:

Re: exhaust gasket sealer
 

You may want check across all four exhaust flanges with a straight edge ,and if there is warpage you will want to have the manifolds milled.

Re: exhaust gasket sealer
 

RWS,


I am working with brand new alluminum exhaust manifolds-I burned up the old ones because of some poor water flow to the manifolds that I think(hope :eek: ) I have resolved. The main issue is the cylinderhead port surface area...very pitted and don't want to try and puttin them on without some sort of sealer.

Thanks for the heads up