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Leaks in the gap between the head and the intake manifold can cause performance issues and worse. Our 440H, Ruby, has the Power Pak option, which means it has a two barrel carburetor:
Notice the gunk on the edge of the intake manifold? Our guess is that this is created by air seeping by, and a buildup of oily crud gathers in the crack. The intake manifold is aluminum. Alcoa, no less:
A close-up of the evidence that there is a slight air leak:
The new intake manifold gasket has a bulge along this same area:
I like to coat gaskets with Permatex Ultra Copper spray:
Here is a new carburetor gasket installed. The intake manifold is all cleaned up and ready to go on the engine.
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