What heads
#2
241's, not worth working over to gain maximum performance, but they can be made decent. for the $$$ youll have wrapped up in them, making them perform 100% to their potential, you could have had TSP's or TEA's or somthing like that.
#6
the 5.3s have smaller combustion chambers(I believe 57cc) and the LS6s have(64cc..not sure) which help the compression ratio and up the power.
the 5.3L heads have shorter runners do for better low to mid range power.
the 5.3L heads have shorter runners do for better low to mid range power.