Yes, but the LS1 used less than 58psi with the same injectors. I know the early returnless systems used that filter/regulator deal out back, but around mid 03 GM got rid of the filters and changed the tank design on the Corvettes so I wonder if they went PWM then? On my 04 Z06 there is NO filter to be changed, just wait for the pump to die and the injectors to clog and deal with that.
EDIT: I stand corrected. Looks like there is still an in-tank regulator with the FFS system. And everywhere I look, people claim the LS1 runs 58psi. When I first got my car, I remember finding a page that broke down the differences between the LS1 and LS6 (which I of course can't find) and it claimed LS6 used higher fuel pressure with the same injectors thus producing the increased fuel flow alluded to by John Juriga when the LS6 debuted. Now I feel like a dumbass for spouting off nothing.
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