19330894

LSX-DR CNC-Ported Cylinder Head

• Fully CNC ported • 356-T6 aluminum racing head, 5/8" thick deck

• LSX-DR rectangle intake port design—requires LSX-DR intake manifold

• LSX-CT/DR spread port exhaust port pattern

• Cast-in down-nozzle bosses (not machined)

• Designed for up to 2.280" intake and 1.620" exhaust valves (4.165" minimum bore)

• Machined for 1.660" valve springs; 11° valve angle

• Minimum 4.125" bore

• 313cc CNC’d intake ports,116cc CNC’d exhaust ports

• 50cc CNC’d combustion chambers

• Requires shaft-mount Rocker Kit P/N 19201808

• Capable of over 900 naturally aspirated horsepower!

• Installed on LSX454R engine assembly