V21 is the option callout for the flat-black hood treatment that pairs with the Six-Pack and Hemi performance hood scoops. The blackout area covers the scoop assembly itself and the surrounding raised hood center panel; it absorbs underhood reflection and frames the scoop as the visual centerpiece of the car.
On Phil's 1970 V-code Super Bee the V21 paint is visible in the 440-callout detail shot — the matte field surrounding the chrome 440 emblem. The treatment is correct factory practice for the engine and option set; cars without V21 either skip the scoop package entirely or were re-painted with the blackout omitted.
