Ken you are right about the norris thermadore sys it was junk and we had alot of customer complaints about them but it was a start. 2 yrs. later they were improved on buy detroit and and became std equiptment and yet some people even took thoes off. They actually help the eng and performance how dumb is that. I have seen the auto industry and hot rod qualty really evolve in the last 60 plus yrs.