Chevrolet Performance LSX-LS7 CNC-Ported Cylinder Head -19354239. Great cylinder head airflow is yours with Chevrolet Performance LSX cylinder heads. With power-building attributes, these aluminum heads are manufactured from 319-T5 aluminum alloy and assembled with premium lightweight hollow-stem valves, sodium-filled exhaust valves and–on some models–titanium intake valves. Ensure maximum airflow and exceptional performance with Chevrolet Performance LSX cylinder heads. 6-bolt per cylinder bolt pattern. LS7 style rectangle port design. Assembled with 2.200″ titanium intake and 1.610″. 12° valve angle, Minimum 4.100 bore. 270cc “as-cast” intake ports, 85cc “as-cast” exhaust ports. 70cc “as-cast” combustion chambers. 650 lift with premium springs. Uses LS7 rocker arms/LS7 bolts. Sorry, our items are NOT available for pick-up. No additional information at this time. You might also like. 12361051 – PARTIAL SET Chevrolet Performance Spark Plug Wires -12361051. Chevrolet Performance LS1/LS6 Cylinder Head Gasket Kit -12498544. 15156588 – Weld-On O2 Sensor Boss -15156588. 12578549 – V-ribbed Performance Belt -12578549.