Speedmaster PCE281.2091 Assembled Cylinder Heads GM LS3/L92/L76 6-Bolt Roller

Chevy GM LS3 L92 L76 250cc 64cc Hydraulic Roller Assembled Cylinder Heads Speedmaster LS-series cylinder heads are rapidly expanding. The LS (Gen3/4) platform has many design benefits over the earlier SBC engine designs, most notably the cylinder heads. Although the GM heads are good pieces, We have developed a superior line of heads for modern performance enthusiasts. Like all Speedmaster cylinder heads, the LS-series heads are produced using our "Gravity Casting" process. This process ensures a more uniform and robust casting, laying a strong platform to build on. Assembly Specifications Max Lift: .625"Coil Bind: 1.180"Intake Install: 140lbs @ 1.8Exhaust Install: 140lbs @ 1.8Open Seat Pressure: 335lbs. Assembled with the finest premium components to provide your engine with optimal airflow for maximum engine performance Improved power throughout the rpm range for greater throttle response and top-end horsepower