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 - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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