Edelbrock Cylinder Head E-Cnc 212 GM Gen IIi Ls CompleteThe Edelbrock 79949 E CNC Small Block Chevy GEN 3 & 4 LS cylinder head are designed for 1997 & later GEN 3 & 4 LS1 LS2 Chevy engines including 4. 8L, 5. 3L, 5. 7L & 6. 0L. The E CNC Cylinder Head feature fully CNC'd intake ports, combustion chambers and exhaust ports for improved air flow. Dyno tests proved this head is capable of 457 hp & 438 ft lbs. of torque. High quality conical beehive springs are secured with steel retainers and valve locks for