What goes here?
 

What should I use to plug port side valve cover vent?

http://i1151.photobucket.com/albums/...psgse657y6.jpg

I believe that is a vent to your flame arrestor.

on the starboard side it vents to the manifold, on the port side it goes nowhere.

Suggestions?

Pcv valve

Do you plumb the PCV to anything? It seems like it was just left open by merc.

PVC valve and hose connects to fitting on front underside of upper intake

Other side connects to flame arrestor

That's a nice looking engine you have there!

Thanks Dave.

I don't have the factory flame arrestor. Can I tee it into the hose for the other?

I have an older style mpi manifold that tee'd both vents together then into the manifold but the tee was a funky plastic piece that was merc only I'm sure.

Hey Cole, what kind of power did it make, it is a custom tuned ECM right ??