Chevrolet Performance L92 Cylinder Head for 4.000 Bore

Great cylinder-head airflow has been a key enabler of the LS-Series‘ exceptional performance. Chevrolet Performance delivers those power-building attributes to you with a range of production-style aluminium heads ﾖ from the LS6 heads for smaller-displacement engines to LS7 style heads for 427-inch-and-larger combinations, our aluminium heads benefit from GM‘s extensive research and development program, ensuring maximum airflow without compromises.

In fact, many professional builders use our heads as straight bolt-ons, with no further machining. Many of our assembled heads use premium machining and materials, including CNC finishing and porting, along with lightweight, hollow-stem valves, sodium-filled exhaust valves and ﾖ on some heads 3 lightweight titanium intake valves.Combustion Chamber Volume (cc): 70

Cylinder Head Style: Assembled

Cylinder Head Material: Aluminium

Intake Port Shape: Rectangular

Intake Valve Diameter (in.): 2.165 in.

Cylinder Head Colour: Natural

CNC-Machined Combustion Chamber: No

CNC-Machined Intake Runner: No

CNC-Machined Exhaust Runner: No

Intake Port Location: Standard

Exhaust Port Shape: D-port

Exhaust Port Location: Standard

Spark Plug Style: Straight

Intake Valves Included: Yes

Exhaust Valves Included: Yes

Exhaust Valve Diameter (in.):1.590 in.

Valve Springs Included: Yes

Maximum Valve Lift (in.):0.510 in.

Camshaft Style: Hydraulic roller

Damper Spring Included: No

Number of Springs Per Valve: Single

Retainers Included: Yes

Retainer Material: Steel

Locks Included: Yes

Valve Stem Seals Included: Yes

Rocker Arm Studs Included: Yes

Rocker Arm Nut Thread Size: 3/8 in.-24

Rocker Arms Included: No

Rocker Arm Nuts Included: No

Guide plates Included: No

Accessory Bolt Holes Drilled: No

Valve Guides Included: Yes

Valve Seats Machined: Yes

Steam Holes Drilled: No

Oiling Style: Through pushrod

Machined for O-Ring: No

Heat Crossover: No

Formerly Part number: 12629062