well, the trannys the only thing we need to look into getting fixed.. the cars flawless ontop of that.. only a minor scrape on the side because of hail in upstate NY

 

The Vortec is a specific cylinder head basically, It is a design in which the intake runners cause the air fuel mixture to swirl in a sort of vortex, and I believe that's why they named it "Vortec" And I think ALL 4.3's were built with the vortec heads, it just didn't pick up the name until later I could be wrong about that, but I think that's how it went down. Also Vortec is not just a 4.3 design...I have a set of Vortec heads on my Caprice,(350 or 5.7)that came off of a 1999 chevy pickup. Now every gasoline engine that chevy makes except the Saturn based ecotec 2.0,2.2 and 2.4 are Vortecs.

 

https://blazerforum.com/m_5987/tm.htm
This is a link to an old thread that will help you understand whats different aboutthe Vortecs.

BTW Chevy still makes the OHVs

 

thaks for the link. Saved me from typing all that again.