If you're running an LS crank, you must run LS length rods. As you know, the LS has a longer stroke than the GSR, but the same deck height. If you run GSR rods on an LS crank, kaboom...piston hits the head.
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2015 Ford Mustang GT Fastback - Ingot Silver - 6M - Performance Package - Gibson Catback, JLT CAI, FR 47lb injectors, BAMA E85 tune, Eibach Sportline, BMR wheel hop kit, UPR oil separator, Steeda shifter bushing/bracket
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