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My take on blocking off grilles.
Start blocking at the top and work your way down.
Ideally use air that would normally go under the vehicle to cool.
Thinking is if your going to divert air, divert it to a place that will create the least amount of drag on back. high sides or over top
Keep in mind the under hood temp, heat shortens the life span of most materials. battery etc.
An air dam down to the bottom of the diff. that diverts up thur the rad. is a win-win. (corvette)
Putting narrow bars in the grill closer together, typically makes it stall at a lower speed automatically blocking the grill. Allows lots of air at lower speeds but limits air at higher speeds when you have plenty.
Got to go my internet dies if the temp drops below 14 degrees.
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