These are neat.  They are only for factory original Turbo III heads (these will not fit the later style DUNN) replacement heads.  If you don't know which head is on your Iroc R/T, Spirit R/T, or Phantom R/T email us and we'll tell you which one you have.  
 
These core plugs replace the original/factory steel plugs so your head doesn't risk cracking.  If you own a T3 car, chances are you already know about this vulnerability with these heads.   What is neat about these plugs is that you can see the coolant inside the head and they are ethylene glycol safe.  
 
Pick up a set for your Turbo III powered car!   Price is for a complete set of 3.  (enough to do 1 cylinder head)