Reply To: Copper rimmed head gasket advice

[DAN ANDERSON]

Gasket Sealing Compound (Permatex Aviation Cement) or Mercury Perfect Seal will not hurt any application. Especially where NOS dry gasket material is involved. Even the new sticky gaskets OMC/BRP makes that say “NO Sealer needed” can benefit from sealer. I know that seems weird, but OMC put sealer on gasket labeled as not needing sealer to pass the initial pressure test before the engine was warmed up. The thermoreactor substance doesn’t kick till the block comes up to temp and retorqued.
The old NOS gaskets really benefit from a sealer in my opinion. OMC/BRP quit using the sealer because of paint adhesion problems. Different assembly techniques also changed the way the motor was tested.

Dan in TN