Allow Radiator Ducting and Opening of Grills
#29879 from Andrew Aquilante · Recommended to the Board · Minutes (2021-07 Fastrack)
In GCR, Section 9.1.9.2.D.8.a., add the following:
"8. Exclusively for engine radiator cooling purposes, it is permitted to remove the outermost non-metallic webbed false grill
openings that are closed in mesh style factory grill openings. Maximum allowable increase in grill opening area is 16 square
inches. The modified grill opening mesh shape and contour must be retained as delivered from the manufacturer. This allowance
does not permit modification to brake or intercooler grill openings. Note - It is the competitor's responsibility to be able to verify
that 16 or fewer square inches have been removed."