BRODIX has once again raised the bar in the LS compatible cylinder head war! With the introduction of the BP BR 1 13, BRODIX delivers the best LS cathedral port compatible cylinder head on the market. This head offers a 13.5° valve angle paired with nitrous/boost friendly combustion chambers that fit existing pistons. This 100% CNC ported head utilizes 2.100 / 1.600 valve sizes and features newly designed 245 cc intake ports that flow over 370 cfm as well as redesigned exhaust ports that flow over 235 cfm. As with all legendary BRODIX products, these heads are made in the USA with A-356 virgin aluminum alloy.