Cams don't make a difference. The Viper is an 8L... it only has ONE cam. It has pushrods. You can have as big a single cam as you want. The Accord 3L is a SOHC. Mecedes Benz's 5L V8 is SOHC. Displacement has no bearing on how many cams you need. As long as something is opening and closing the valves.