EBC GD7064 73-74 Buick Apollo 4.1 GD Sport Front RotorsEBC GD7064 73 74 Buick Apollo 4. 1 GD Sport Front Rotors Product Information EBC Sport Rotors feature wide aperture slots that draw cool air into the braking contact area and reduce temperatures preventing brake fade. Dimple drilling avoids stress cracks and the anodized EBC finish provides a great look while preventing corrosion. EBC Sport Rotors now feature reduced 3 slots venting which provides slightly less air noise under heavy braking while