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