Like the stock cylinder heads, Trick Flow’s heads can be installed on either bank of the engine. However, you need to designate one for the driver side and one for the passenger side. The locations of the oil gallery plugs are different from bank to bank. Though the gallery plugs are shipped with thread sealant, I’d recommend adding a small dab of Teflon paste to each as you install them. I had a couple of leakers once the engine started.