If the valves are not closing that either means you have poorly adjusted tappet gaps, burnt valves or carbon build up on them. None these are really the result of a manifold gasket.
And the weak point of the gasket is not between the exhaust and intake ports, that is actually their strong point. The bolts are in between these ports and most of the clamping force is here. It would be more likely that the gasket would leak from the top and bottom. Meaning that they would suck air on the intake and then it make the engine idle high, and he would have noticed this when he sprayed carb cleaner around the manifold.
And there is really now way if it could happen , but if exhaust gasses where somehow making there way over and into the intake port it would cause the engine to run rich and the plugs may appear a little wet when he took them out. But then engine runs just fine when you put a little exhaust gas back into the intake , as in the whole principle of EGR. Exhasut gasses are recirculated into the intake to lower combustion chamber temps in an effort to hold off detonation allows further timing advancement, equalling more power and better fuel economy.
If you look at your manifold on your 140 you will see what I am talking about when I say it is almost impossible for the manifold to leak exhaust gasses across the manifold gasket area.
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Today's Featured Article - Harvestin Corn in Southern Wisconsin: The Early Years - by Pat Browning. In this area of Wisconsin, most crops are raised to support livestock production or dairy herds in various forms. Corn products were harvested for grain, and for ensilage (we always just called it 'silage'). Silo Filling Time On dairy farms back in the 30's and into the first half of the 40's, making of corn silage was done with horses pulling a corn binder producing tied bundles of fresh, sweet-smelling corn plants, nice green leaves with ear; the
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