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depends upon which version/configuration you have.....when I worked in the shop, we put the full flow under the riser and the restricted flow under the elbow....on the RWC systems....
OK.... If you have a four hose system, one on each elbow and on the bottom of the exhaust manifold, you use a restrictor gasket between the elbow and spacer and an open gasket between the spacer and manifold.
If you have a two hose system, hose only attached to the bottom of the manifold all gaskets are non-restrictor type.
OK.... If you have a four hose system, one on each elbow and on the bottom of the exhaust manifold, you use a restrictor gasket between the elbow and spacer and an open gasket between the spacer and manifold.
If you have a two hose system, hose only attached to the bottom of the manifold all gaskets are non-restrictor type.
Took it apart and found the upper gasket was a restrictor type. The previous owner replaced them as part of the sale conditions.
One of the reasons I'm pulling these apart is that the riser was rusting. Nothing bad just surface. but now wondering. Surveyor didn't indicate any issues with temp when we did the sea trial. He used a thermal scanner while we spun the boat up to WOT a few times. This was the boat I had asked about with stuck valves a couple years ago. Motor has been running great but I just didn't like seeing the rust and wanted to clean up a few other things as I didn't like the way the previous owner left them. A little bit of OCD on my part I guess.
Two hose system has Non restricted gaskets. PN 863726