I don’t know what year you are looking for, but I know GM sells some delete pulleys over the counter. I found the 3rd gen part number at thirdgen.org. That is where I got the part number for the air pump delete pulley I needed. You can buy it at gmpartsdirect.com. I might suppose you can get one for a 4th gen, maybe search lt1tech.com or ls1tech.com
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