So I have a AST on my FC which is a different but effective way to quickly purge air from my coolant system. I have an issue getting two radiator caps to recirculate correctly. I thought I would steal an idea from some Nissan guys and plumb the relief/recirculating hose from my radiator to my AST. This would eliminate one recirculating path. Any issues will pressurizing both sides of a radiator cap?

Here's the Skyline setup



Here's Mine