See more about this engine here: http://blogs.hotrod.com/404ci-boss-ford-by-jon-kaase-racing-at-the-amsoil-engine-masters-challenge-2014-145517.html
This Engine Masters entry from Jon Kaase Racing is a 404ci Boss 429. It made 666 horsepower and 591 lb-ft of torque during the dyno competition at the 2014 Amsoil Engine Masters Challenge presented by HOT ROD. Engine Masters is an annual shootout of engine builders in competition for huge cash prizes. For 2014, the Challenge is for two-valve V8s above 400ci, running on 101-octane fuel, and making optimal power from 3,000-6,500 rpm. The competition is held at the University of Northwestern Ohio.