LS3 / L92 Aluminum Cylinder Heads – High-Flow Cathedral Port Performance. Upgrade your LS-based build with this set of GM LS3/L92 aluminum cylinder heads, known for exceptional airflow, reliability, and horsepower potential. These factory GM heads are a popular choice for naturally aspirated and boosted applications-from street performance to race builds. Genuine GM LS3 / L92 Cylinder Heads. Aluminum construction for lightweight high performance. Rectangular-port design (not cathedral-port). High-flow intake runners supporting 500+ HP with proper setup. Excellent for stroker builds, turbo/supercharged setups, or cam upgrades. Compatible with 6.0L and 6.2L LS engines L76, L92, LS2, LS3, L99, etc. Intake Port Volume: 260cc. Exhaust Port Volume: 87cc. Combustion Chamber Size: 68cc. Valve Size: 2.165″ intake / 1.59″ exhaust. Casting Numbers Common to L92/LS3: 5364, 821, 823 (list yours if needed). (You can adjust this section-example below). These heads are in excellent used condition. No cracks, no repairs, no broken bolts. Valve seats and guides are in good shape. Surfaces are clean and ready for assembly. Removed from a running engine. LS3 / L99 (Camaro, Corvette, SS, G8). L92 / L76 6.0L/6.2L Truck Engines. Works with most aftermarket cams, OEM or aftermarket rockers, and LS3-style intake manifolds. Why These Heads Are Popular. Huge performance gains over early LS heads. Accept large camshafts & boost. Proven 30-60+ HP improvements when paired with the right setup. Affordable OEM alternative to aftermarket heads. (Modify based on your listing). One of LS3/L92 bare cylinder heads. Valves and springs included (or specify “no valves” if bare). Rockers NOT included unless stated.