Nope. Wikipedia was WRONG on this. (I updated)
1985 or 1986 depending on who you talk to. The first Vortec was the 90 degree 4.3L V6 as used in the light-duty trucks. I'm seeing references to 1986 being the first year, but they were available in '85-model-year vehicles such as Astro and 1/2- and 3/4-ton pickups. (Which might mean that the Vortec engine was available in late 1984, as an early-production '85 model-year vehicle.
https://i.pinimg.com/originals/24/5b/18/245b187da9010ea79f4f85d65faab27a.png
and an ad that actually mentions "1985" model-year:
https://jl-discourse-uploads.s3.ama.../450304d1f4f1bdce16fd8490bfa40a315db0df19.jpg
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