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Wondering who built your Grand Sport Engine at the Wixom Performance Build Center? Below is a picture of the nameplate mounted to the engine - photo is courtesy of Tom Read, GM Powertrain.
LS3 (4 manual GS coupe Vette) builder label found on front lower rt of intake:
LS3 (4 manual GS coupe Vette) builder label found on front lower rt of intake: