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I just spent days looking at this. Finally, decided on Centric, but they are cross drilled. I got all 4 for $278 with free shipping.
I did find that EBC makes Z51 rotors that are slotted and dimpled which would be the next best thing to blanks I guess. These are more expensive. I think they are called 3GD sports.
One of the online auto parts stores had a 15% off coupon and I priced the EBCs at ~$550 for all 4 with free shipping using the coupon.
BTW to the OP. I do not believe that the ACDELCO rotors are Z51 sized. Just FYI.
Where did you find the Centric z51 rotors for the 278.00 with free shipping if you dont mind sharing the info? Thanks big guy;
Scottie
I got mine at Autobarn, but it looks like the price has gone up after I ordered them. There are several places that offer free shipping. Search on 120.62086 and 120.62096 at frugalmechanic.com