Well...first of all, the trucks in NASCAR have absolutely no relationship to their production counterparts. Neither the frames, bodies, suspensions, electronics, nor engines are remotely related to production trucks. However, the NASCAR Ford engine does have some roots in the 70s 351Ws and 351Cs. I've been a motorsports fan for over 40 yrs, and have attended multiple NASCAR events per year for more than 20 yrs; however, I maintain an interest in F1. F1 is the ONLY major sanctioned auto racing series that doesn't REGULATE and MANIPULATE the specifications of the cars to maintain an equal/even playing field. The same rules apply evenly to all the participants at any given time. No "adjustments" are made to one make or the other to "even things up". If F1 ever does this, it will lose my interest. Even if F1 racing isn't as competitive as NASCAR, we need at least one series that depends on pure technology and driver skill. All other sanctioning bodies have constantly changing rules that attemp to maintain parity or require uniform engines among the participants. This may make for better racing; but it also allows the sanctioning body to influence/determine the winners. I believe that the ASA series folded because they required all entrants (Ford, Chevy, Dodge) to use the Chevy LS series engine! How could a Ford or Dodge enthusiast root for a Chevy powered Ford or Dodge? This was done to "reduce the costs of racing"; but IMO, it killed the whole series. Other bodies, like the Gran-American sports car series, specify all kind of different engine specifications to make all the different engine makes "even" in horsepower output. So, we never know what make is really the best piece. In F1, there is no doubt who provides the best engine, car, and driver under a set of specs that apply to all entrants......something to be said for that.