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At the advice of all here with a tip of the hat to AdrzejM I added more block off on the grill itself. I blocked off the right side from behind. I have included a photo here of the right side with the block and the left without. From normal viewing angles you cannot tell the right side is blocked off. I used .062 aluminum sheet stock and painted it black.
Here is the math. Counting the hole in the bumper, by the time I block off the left side of the grill I will have blocked off a total of 340 square inches of opening, and am leaving 112 open to the air. Do you think I have over done the block offs?. I have a large 16" electric fan with a full shroud, which has two speeds and a cross flow aluminum radiator. I am also running Evans coolant. Thanks for giving the information to know what to do here. The block on the right side was easier than I thought it would be. It took a fair amount of trimming and fitting, but did not require removing anything except the upper aluminum air flow panel.
Sam
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