The final stage of revamping of the GK-3 cat cracker reactor block with introduction of new technology is described. The elements of implantation are: combined external riser reactor; high-efficiency feedstock and slurry nozzles; crude treatment cyclone; cracking product cooling unit; two-stage catalyst stripping; regenerated catalyst transport system. As a result, the yield of naphtha is increased by 4.6 wt. %, and steam consumption in the reactor block is reduced by 15%; the unit is converted to a two-year servicing schedule; the feedstock is high-end-point vacuum distillate; the reliability and safety of operation are increased. Key words: cat cracking, reactor block equipment, riser reactor, nozzles for spraying feedstock and slurry, cyclones, naphtha cut, octane number.