[Shane@DBPerformance]

They are Lucas. Which could be resold by RC, PTE, FIC, Delphi, Holley, FMS or some other company. The Lucas 550s are rebranded by all kinds of companies. RC will usually scratch something like SL-550 onto the side of their injectors that tells what kind of car they are for and what size. PTE will usually have some scratching to identify them also for type and flow, but you need to call them with the numbers.