Great choice for naturally aspirated engines and applications where 75-200HP nitrous systems will be used. For 1997 and up LS Series GM motors No core charge! These high performance cylinder heads are made from Patriot Performance's custom 5 axis CNC machined new GM castings and are a must have for any performance oriented GM LS series engine. Equipped with 21-4N Stainless Valves, Titanium Retainers, Patriot Glod .650" Dual Springs, Custom Honed Bronze Guides, and a 5 Angle Valve Job. Sold in pairs. Shipped separately from factory. NOTE: SKU numbers ending in F are factory shipped and may take a little longer to reach you.
