ok, getting conflicting ideas on 351 2v heads. I have a 351 4v motor q code cobra-jet with 4v heads and am rebuilding the motor. From what I have heard and read, the 2v 351 heads closed chamber would be best ? The 4v heads are great for big performance, but I'm just cruzin on the street only. I've been told the 2v closed chamber heads only came from australia ? Really ? Anywho, does anyone have some insight into this ? I'm currently about to rebuild some 2v open chamber heads and am on the fence of what to do ? please any help would be great, thanks jim - And if someone has closed chamber 2v heads for sale ?