6.2L LS3 VS 6.2L LT1, STOCK VS STOCK, MOD VS MOD, WHO MAKE MORE HP? FULL RESULTS. HOW DOES THE GEN 4, 6.2L LS3 COMPARE TO THE GEN 5, 6.2L LT1? HOW MUCH EXTRA POWER ARE THE VARIABLE VALVE TIMING (VVT), HIGHFLOW HEADS AND DIRECT INJECTION (WITH HIGHER COMPRESSION) REALLY WORTH? IN THIS VIDEO, WE COMPARED THE TWO ALLALUMINUM 6.2L MOTORS IN STOCK TRIM, THEN WITH SOME MODIFICATIONS. HOW WELL DO THEY RESPOND TO PERFORMANCE MODS? IS THE GEN 5 REALLY THE NEXT BIG THING IN LS/LT PERFORMANCE? IT'S ALL HERE.