Note if this product is to be used with aftermarket (tall) EV1 performance injectors: LS2, LS3, and L99 applications will require taller brackets and Adapter O-rings to be used with EV1 injectors. Holley part number 534-212 will have these required parts, but is not yet available. LS1 and LS6 application will work with EV1 Injectors without any additional parts. Holley part number 534-211 allows easy connection to factory fuel lines.