They are Cast Iron heads with no casting numbers, No writing anywhere that I can see except a THS stamp on them. There are end milled completly flat with accessory holes drilled. They have holes for center bolt or perimeter bolt valve covers. 3/8 screw in studs and guide plates. They have heat tabs on them that also say (THS warranty void if removed) 2.02/1.60 valves, and "Vortec" intake bolt pattern, No exhaust crossover.

 

pics?

 

http://s161.photobucket.com/albums/t226/ChadNickel/

 

Anybody have any idea who the manufacturer is of these heads or where I can get some more info on them? Any other forums that anyone might know?