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 - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I’m handing him tools and he says, "give me that..." and I’ve already got it in his hand or "hand me that....."and I’ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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