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It's my understanding sometime during 2023 on the LT1 they increased the rotor size on the 4 piston possibly due to the copper free, you'll need to measure the rotor and track down the 4 piston RPO code for that size rotor then you can find a part number, you will also need brake lines the single piston lines will not work with the 4 piston. If you have 12.6" 321x30mm rotors you're looking for J55 RPO calipers, good luck.
Last edited by dpevans; 10-26-2024 at 09:10 AM.
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