Assembled LS3 Cylinder Head 3.900"-3.960" Bore

The Mast Motorsports 510-301 Rectangular Port LS3 Cylinder Head is engineered to upgrade your GM Gen III engine with the advanced technology of GM Gen IV heads. This fully CNC machined aluminum cylinder head is a perfect fit for LS1 and LS6 engines and short-blocks, offering an easy bolt-on conversion. Featuring a 11-degree intake valve angle and an 11-degree exhaust valve angle, this head is designed to accept LS3/L92 valvesprings, rocker arms, and intake manifolds. It utilizes a 2.080" intake valve and a 1.570" exhaust valve, and comes standard with a 63cc combustion chamber and a .750" deck thickness. The bore range for this cylinder head is 3.900"-3.960". Each Mast Black Label cylinder head assembly includes a fully CNC machined aluminum head, Mast micro-finished .650 lift beehive valve springs, lightweight stainless steel intake and exhaust valves, lightweight steel retainers, and machined locks. Please note that gaskets, valve covers, rocker arms, and pushrods are not included and must be sourced separately.