8. The Fast Burn aluminum heads were ground around the seams and corners. HHR machined the lettering off the smooth flat front surfaces, filled the accessory holes, and reshaped corners and edges to look more like a rougher casting. A scaler was used to add the texture of cast iron. Chevy engine orange paint finishes the illusion. You could go even further with more machining to replicate the raised stampings found on the front of 265 heads.