94YellowTAGT

what is the size of ls1 rotors? And LT1 rotors, it looks like about 2 inches difference.

LT4Firehawk

Try doing a search (here, on LS1.com or frrax.com). I don't remember exact specs off the top of my head, but yes it is a little under a 2" difference (the LS1 rotors are just under 12", while the LT1 units are about 10"). The upgrade is well worth it as it will look better and stop better.

94YellowTAGT

I just got mine installed with my hawk hp plus pads. I love it. You better were your seatbelt or youll kiss the windshield.

WestCoast96Z28

LS1 is 12" in front. LT1 is 10.8" in front, 11.5" in rear.

LT4Firehawk

Are you sure on that? I definitely know the LS1 setup is slightly under 12" (either 11.8 or 11.9, can't remember specifically), and I thought the LT1 rotors were closer to 10.5".

FastrDamnit!

LS1 OEM rotors: 11.9"front / 12.0"rear

Capn Pete

^^^ Sounds good to me. I measured mine last month when I did my brakes, and that's about what I got.