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Interesting. Usually this site recommends blocking the upper grill. The reason for this is engine compartment turbulence. Air coming across the bottom of the radiator doesn't have to go as far, or jump through as many hoops, to exit the engine compartment as does air that comes in through the upper grill. Not sure the difference would be noticeable between the 2 options, but a factory grill block is probably going to fit nicer, look better and require less work than a DIY.
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-Mike
2007 Ford Focus ZX5 - 91k - SGII, pending upper and lower grill bocks - auto trans 
1987 Monte Carlo SS - 5.3/4L80E swap - 13.67 @ 106
2007 Ford Focus Estate - 230k - 33mpg - Retired 4/2018
1995 Saturn SL2 - 256K miles - 44mpg - Retired 9/2014
Cost to Operate Spreadsheet for "The New Focus"
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