I kind of left out a few details didn't I…
The heads are from 1990 #342.
Greg Van Deventer did the porting
The coating is a thermal coating applied to the exhaust ports, combustion chambers, and valves. Swain Technologies did the coating. No powder coating on the exterior (still stock color).
Here is a link to some pictures:
http://www.unclerobin3.com/lt5heads/...ted_Heads.html
A bit of history about me: Acquired a ZR-1 (1990 #342) November 1999 and sold it May 2007.
Been around the zr1.net in the earlier days, recently migrated over here (like several others I believe) from the Corvette Forum.
UR