Corrosion between Gil Manifolds and Risers

[gripit]

I was wondering if anybody knows what causes corrosion between Gil Exaust Manifolds and the Stainless Steel Risers?

[Iggy]

Looks like dissimilar metal corrosion.
When two different metals are joined, like the aluminum manifold and stainless riser, an electrical potential is formed causing electrolysis (corrosion).
Try running a ground wire from the riser to manifold then a wire to the engine block.

[Pwrbt33]

Hi Evan, I have seen this happen when a sealer isn't used when installing the gaskets and moisture plate. I usually have to put a small thin bead around the inside flange on the top and bottom of each gasket and then install the risers.

John

[DORaymond]

gripit - is that a ground cable connected to the tailpipe studs?

[gripit]

Originally Posted by DORaymond

gripit - is that a ground cable connected to the tailpipe studs?

Yes, it is a ground cable. Maybe the Ground cable between motors may be causing additional corrosion? What do you guys think? Has anybody else had a simular problem?

[RonS]

I believe that ground strap should be running from engine block to engine block