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How much gas do you think you can save with the cam swap? My guess is that it would be rather less than 10%, probably more like 2-3% overall. Multiply that by how much gas you use per year, and by the price per gallon you want to use as your comparison. Then compare that to the cost of the cam swap, plus the cost of any tuning you have to do in order to accommodate that swap.
Unless you use a whole lot of gas every year, it will likely be many many years before you break even on the $$ spent.
-soD
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