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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