I've heard that rule a few times as well, but at 5 or 6 different NHRA sanctioned tracks that I've raced at, it hasn't been an issue. I run about 30-40% coolant year round.
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NMRA O/C 9516
NA pumpgas stickshift 347 10.65@125.6, 6.73@100, 1.41 60ft
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