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