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Any performance cam will lower your gas mileage (period). If you are going for economy and not performance then there is no need to port the heads, since economy driving is done at low RPMs and velocities are low. In fact trying to port the exhaust may destroy the anti flow back and scavenging that is inherent in most exhaust port designs. Just keep your old cam and that will save more money than any new cam and porting will make up in mpg.
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- Tony
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