Cylinder Heads

Part Number: LS3CNCPACKAGE

• Intake Port Volume:  281cc
• Exhaust Port Volume:  98cc
• Our 281CC LS3 / L92 / L99 / LSA head was developed specifically for the stock displacement LS engine to deliver improved cylinder fill in the lower RPM ranges while adding substantial airflow increase in the upper Ranges as well.
• Our testing has shown over 30 hp increase while improving torque below the curve.

Part Number: gpi-l83-heads

• Our L83 head was developed specifically for the stock displacement 5.3L Direct Injected engine to deliver improved cylinder fill in the lower RPM ranges while adding substantial airflow increase in the upper Ranges as well.
• Our testing has shown over 30 hp increase while improving torque below the curve.

Part Number: LT2CNCPACKAGE

• Many hours of R&D have gone into the development of our incredible Gen 5 LT2 CNC program. With huge flow numbers and an efficient port shape, the GPI CNC ported Gen 5 LT2 offering is truly bolt-on performance!
• Our LT2 head was developed specifically for the stock displacement LT2 engine to deliver improved cylinder fill in the lower RPM ranges while adding substantial airflow increase in the upper Ranges as well.
• Optimized Airflow Design: Specifically engineered to boost airflow while preserving port velocity, ensuring a harmonious balance for remarkable efficiency.
• Refined Intake and Exhaust Ports: Meticulous enhancements to the intake bowl and seat area, coupled with improvements to the exhaust port, contribute to superior engine performance.
• Unaltered Power Curve: These heads are designed to elevate engine output without shifting the existing power curve, maintaining the engine's characteristic responsiveness.