Heres what they had to say about the show i took it strait from the link red65 posted.
We built 3 motors for the show titled “the fastest muscle car engines of all time”. We did an L88 Chevy, a 427 tunnel port FE Ford, and a 426 HEMI for them to dyno test. The motors were to have things done to them that would have been done by places like Yenko, Mr Norms, and so on. I have no idea what kind of spin will be put on this show, but I can assure all you guys that MOPAR will be properly represented. Though the Hemi is a pump gas motor, it may have a couple more twists of the wrench than the others, but don’t tell any of the Chevy or Ford brethren. Everything had to be put together from the parts we had available. The end result should please all you guys. Yes that motor has more work in it than it should, but we used what we had at the shop for motors in progress. (note: a 500 cubic inch short block was in the shop at the time...) Remember television is for entertainment, much like the internet, so don't read too much into it. Also, it's not like it was a secret kept from the production. I worked most of my life in underwater production. Every thing I've ever shot has had some unrealistic spin put on it by, post production, or an executive in the production. Unfortunately in most cases (not saying this is the case here) the people in post don't know the first thing about the subject matter. It's just a fact of TV. Two of the most discrediting things said about anything are: I saw it on TV, or read it on the internet. Enjoy it for what is, have a good laugh, and be glad YOU guys know something the VAST majority of viewers don't.