I know that they require 1" (or 2.54cm) of space between hood and engine, to create a little crush zone before people hit parts that won't deform. That's the o

I know that they require 1" (or 2.54cm) of space between hood and engine, to create a little crush zone before people hit parts that won't deform. That's the only thing I know about it, and my source is a review of a C7 Corvette ZR1 (which Chevy cannot sell in the EU to my knowledge - due to the fact that the engine forms part of the hood)