Track tested, Dyno proven cylinder head package.
Our 243CC LS1 / LS2 Cathedral Port Cylinder Head was developed specifically for the stock displacement LS engine. They 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.
GPI has a long reputation for setting records at the track. Track results never lie!
OEM Casting ported and chambered – with valves less springs.
|Lift||Intake Flow @ 28″||Exhaust Flow @ 28″ w no pipe|