why.. becuase most tractors are limited to max torque or close and the rpm is kept very very very low.... and therefore the manifold is usually good for twice the flow that they run..
with that said... if you bypass the govoner, and run it a 5000 rpms.. then by all means the port and polish job will help... but then the engine could not pull for sustain periods of time with out over heating and would need to be overhauled in less than 1/3 of the normal hours...
so if your running it 10 hours a year at tractor pulls for 10 minutes at a time..yes.. if you running 2000 rpm in the field, then your probably not gonna see the improvement.
remember that if you double rpm, you quaduple wear..
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Today's Featured Article - Gettin My Old Tractor Home - by Clayton Sweeney. My name is Clayton Sweeney. I am from Southern Maryland in a small town called Lothian. I am 20 and my father and I are the proud owner of a 1954 Allis Chalmers WD-45. When I was 18, I dated a girl in the next county over. Her family are tobacco farmers. It was a cold Thanksgiving evening, and we were going up to her Grandparents house. As we passed one of their barns, I noticed something orange in the corner of my eye in this old shed. It was pretty dark and I asked what it was
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