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Gary..... ....you can try dual manifold gaskets but it ain't likely to solve yer real problem. Most of the time the block has ERODED around the #4 exhaust port. Because tractor engines usually operate at constant engine speed (governor) and usually near maximum horsepower, the exhaust gas is really HOT and erosive. Iff'n yer exhaust manifold flange is also corroded, buy a new manifold $50 (cheap) And while experienced welders can weld castiron with nickle rod, it takes special heat controled ovens to prevent the castiron from cracking as it cools. And not only that, once you lay a bead of weld, you haffta machine it flat so the gasket will seal. Me? Heres what I'd do for exhaust eroded ports. I'd use HIGH-TEMP epoxy. (while J&B Weld is good stuff, it is NOT high-temp but there is high-temp epoxy available, ya gottta ask) Drill a couple of shallow holes to act like rivets, then clean the eroded area (rotory sander and brake-clean) and puckey the block, clamp a board to flatten the puckey and letter cure for several days. $10 for hi-temp epoxy. Sure beats specialized block welding $$$ or even a new block. Simple, eh?..... ...Dell
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