There aren't any numbers on them. They may not be "swap headers" but they did come off my ls6 motor that came out of a 3rd gen Iroc. They also fit 4th gen cars because they went into my 4th gen without any issue. If you wanna try them your welcome to. If they work, You can buy em, if not you can have your $ back. They are just collecting dust at this point.
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99 Z28 Trick Flow 215s milled to 61cc 228/232 Cam Fast 102 built 4l65e trans 4000 converter 12 bolt 410s Electric WP deleted PS/AC Dyno & Track tuned
2015 ATS Coupe. AWD 2.0 Turbo
2012 2500hd Silverado with LTZ 20s on 35x12.5x20
86 Buick GN Lesabre 1 of 117 (4-Sale)
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