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I understand the car is a small engine car. The port and polish work that people do on these small engines are typically:-
a) Valve stem work
b) Valve lips and seat
c) Exhaust ports enlargement to meet the exhaust manifold bore.
There difference in terms of size of the ports is probably in microns. Measurement of flow is balanced to all cylinders using a pipet tube. In the end, you get less restrictions to flow. And if this was as old as I think it is, it would be good to do dynamic balancing of the whole piston-rods-cranks.
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