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To answer your questions about them running better now is back then you launced off a concrete pad!! unlike today.
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I believe concrete is still the preferred material for burnout boxes and launch pads...if I'm not mistaken, the general trend these days during track refurbishing is to extend the concrete *further* down track...even seems like I remember one of the newer tracks going concrete all the way through the traps...and if ya wanna find the seam between the concrete & asphalt, then watch a pro-stock or 10.5" tire car run, as that's usually where the run gets *interesting*...
