The head differently can make some good power I’ve looked at the numbers Brett has posted the 1 thing I see holding them back is if your looking at a head swap there not just bolt them on and go your going to build a new short block due to the valve angle I looked at them before I did my W9 heads the W9 are hard to beat for the cost of the casting compared to the victors either way your looking at a 1200-1700 rocket set up to due it the right way