The RHS Heads worked real well on my old 410. Brian ported them also. That engine ran real strong. After the Dyno I installed it in the car and drove it down the street, my first thought was this thing is a DOG until I put my foot in it at a Roll in First gear and got into the secondarys banged second hit 3rd and let off, I was like holy crap, this thing moves some pavement. It truly caught me by surprise how explosive it was :D
