Grill Blocks
Is there a general rule as far as how much space you should leave open when blocking the grill on a car? I recently put on an upper grill block on my car and have now decided to do a lower grill block. I would eventually like to do underbody panelling too, so I probably won't be getting much air intake from underneath. Regardless of what I do, I'm still going to test it to see if the engine temperature goes too high. I just want to know if there is a general rule.
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