I just set up an LB7 owner with a set of SAC 45's to replace his original injectors at something like 280k. I have purchase history back in 2003 Mega filter and FPPF Total Power since new with lift pump soon to follow. When he sent his cores in I marked them specifically so that they could be examined for overall wear condition. I believe they finally gave in to the blue smoke seep common to the VCO nozzle.