Correct me if I am wrong.....
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NASA miscellaneous
11.2 "Balancing of Crankshaft and Flywheel is permitted; minimum weights listed in these rules must be maintained."
11.3.3 will allow tape or insulating foam to replace Radiator Seal Plate
12.5.3 For 1999-2005 it is permitted to alter the ignition timing by elongating the mounting holes of the crankshaft position sensor trigger wheel
12.9 Fuel Pressure - Any adjustable mechanical fuel regulator may be used, but it may not be adjustable from the cockpit
13.2: Allowing both the 4.1 and the 99+ upgrade 4.3 but the 4.3 is mandated for the Nationals.
14.1: Front 27mm non-Adjustable or adjustable 24mm front bar ... may be used. However, the 24mm must be used for the duration of the NASA Nationals event.
14.7 1990-97 cars are permitted to use the “R†model tie rod ends part # N021-32-280A
15: Steering rack - allowing shimming (0.5" max) between the rack & subframe.