In accordance with embodiments described herein, there is provided a process for {TAIL ~ hydrocracking hydrocarbons}, said process comprising contacting a petroleum refinery fraction with a catalyst and hydrogen under sufficient hydrocracking conditions, said {HEAD ~ catalyst} comprising one or more hydrogenating metals and zeolite Y, the crystal size of said zeolite Y being less than 1.0 micron 
In accordance with embodiments described herein , there is provided a process for { TAIL ~ hydrocracking hydrocarbons } , said process comprising contacting a petroleum refinery fraction with a catalyst and hydrogen under sufficient hydrocracking conditions , said { HEAD ~ catalyst } comprising one or more hydrogenating metals and zeolite Y , the crystal size of said zeolite Y being less than 1.0 micron
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