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 {TAIL ~ zeolite Y}, the crystal size of said zeolite Y being {HEAD ~ 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 { TAIL ~ zeolite Y } , the crystal size of said zeolite Y being { HEAD ~ less than 1.0 micron }
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