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They are billet and definitely taller than the standard G 3, I ran stock Gen 3 before with a spacer for the aftermarket rocker arm clearance. These covers are actually taller than that set up and they do have that cool factor also. I swapped rockers to some from Prefix to ensure we could spin the motor a little more than stock 🙂 I could have probably gone back to the stock covers but I had these and decided why not. Later on I will be doing a lot of painting, powder coating and anodizing of components but I want to make sure everything works first. David