Yes, they will mill all the ports down to the same level. That is the reason for having the manifold milled. The exhaust ports like to erode and/or warp from the heat. If the difference in clearances from high to low ports is approximately 1/8" or less you can probably get away without milling the manifold, all these manifolds seem to warp alittle. If it is noticably more than an 1/8" you will either break the manifold or have leaking gaskets by installing it without milling it first.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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