LS1 Brake Mod and 18" wheels

[Turbo231]

I'm about to do the LS1 Brake Mod and want to order wheels to match.
I was looking a 18X8 w/4" offset in front before the LS1 Brake Mod.
Should I go with a 4 1/4 or 4 1/2 offset now?
I was going to run 18X9.5 w/4 3/4" in the rear unless someone knows of a better offset.
P.S
295/35/18 rear
245/45/18 front

 

[Greasemonkey]

The LS1 rotors will move the wheel out like .3" (I think, I posted the actual number I measured off mine a couple weeks ago). Probably be better to go with the 4.25" backspacing.

 

[TKGN1]

I've got 17 X 8 with 4 1/2 offset. Pass side wheel will slightly rub wheel well (outboard) on harsh bumps (my car is lowered also). Greasemonkey is correct, LS1 rotor pushes wheel 5/16 to the outside, you might want to go with a little more backspacing to offset the difference.

 

[jdpolzin]

Turbo231, Do you have the LS1 rear discs? Keep us posted on the turn out!! Thanks ----Jeremy