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The Chevrolet Performance LS3 CNC-Ported Aluminum Cylinder Head design benefits from General Motors' extensive research and development program, ensuring maximum airflow without compromises. In fact, many professional builders use this head as straight bolt-ons, with no further machining. These assembled heads use premium machining and materials, including CNC finishing and porting, along with lightweight, hollow-stem intake valves and sodium-filled exhaust valves to provide your engine with the power increase you have been searching for!

Features

Manufactured from 319-T5 aluminum alloy
2.165" Hollow Stem Intake Valves
1.590" Solid Stem Exhaust Valves
15 degree valve angle
276cc CNC'd intake ports
92cc CNC'd D-shaped exhaust ports
68.5cc combustion chambers (maintains stock LS3 compression ratio!)
.550" max valve lift with installed springs
Symmetrical intake and exhaust ports
High-efficiency combustion chambers
14mm, 5/8" hex, 3/4" reach, taper-seat Angled spark plug
Bolt-down-type rocker arms
Center-bolt valve cover hold-downs
Design for any LS engine with cylinder bores of 4.000 inches or larger, including 6.2L L92 truck engines
All fasteners are metric

10% increase in airflow over factory LS3 head

LS3 CNC Ported Head Flow Chart
Valve Lift (Inches)	Intake Flow (CFM)	Exhaust Flow (CFM)
.100	74	89
.200	178	137
.300	237	176
.400	302	228
.500	333	244
.550	348	249
.600	355	253
.700	363	258