sounds like a lifter tic,mine did the same thing first 500 miles,But I've run the hell out of it  now it's got 1500 miles on it and I don't hear a thing 
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TS416,GMPPLSX-LS3 6 Bolt Heads,Custom 80mmComp Turbo,ID850 Injectors, Lonnies Twin Pump Setup,Level 3 4L80E,DSS,3in Magnaflow Exhaust,CoolingMist Meth,RX Dual Catch Can,InnovateWB,Aeroforce Interceptor,AEM Truboost Controller,matte black CF5 Forgestars.700rwhp/712rwtrq
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