You can tell buy the casting numbers, if its an ls1. You could also get a cylinder camera and check the pistons to see if they match with an ls1 piston or if they are aftermarket. As far as a cam goes, pull of the timing equipment off and look at the front of the cam, usually aftermarket companies have some type of engraving on their cams.
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2011 IOM 2SS/RS LS3 M6- Injen CAI, TSP 1 7/8” headers, PTB, Hurst short throw, Corsa catback exhaust, 20" TSW Nurburgrings, BMR lower control arms, BMR tunnel brace, Hotchkis lowering springs. 3660lbs. Tuned by me (sold)
2010 RJT 1SS/RS LS3 M6- CAI, TSP 2” headers, TSP F-35 cam, PTB, Hurst short throw, Dronemaster catback, BMR lowering springs, Kirkey seats, 20”/18” Weld Belmonts, 3550lbs.
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