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Chevrolet Performance LS9 CNC-Ported Cylinder Heads 19433498
Part Number: NAL-19433498
Chevrolet Performance LS9 CNC-Ported Cylinder Heads
Cylinder Head, LS9, Assembled, CNC-Ported, 66.5cc Combustion Chamber, Aluminum, Natural Finish, 2.16 in. Intake Valve, Rectangular Intake Port, Each
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Overview
Brand:
Manufacturer's Part Number:
19433498
Part Type:
Product Line:
Summit Racing Part Number:
NAL-19433498
Item Number:
8113045
Combustion Chamber Volume (cc):
66.5
Intake Runner Volume (cc):
276cc
Exhaust Runner Volume (cc):
92cc
Cylinder Head Style:
Assembled
Cylinder Head Material:
Cast aluminum
Camshaft Style:
Hydraulic roller
Intake Port Shape:
Rectangular
Intake Valve Diameter (in.):
2.165 in.
CNC-Machined Combustion Chamber:
Yes
CNC-Machined Intake Runner:
Yes
CNC-Machined Exhaust Runner:
Yes
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.):
0.550 in.
Damper Spring Included:
No
Retainers Included:
Yes
Locks Included:
Yes
Valve Stem Seals Included:
Yes
Rocker Arm Studs Included:
No
Rocker Arms Included:
No
Rocker Arm Nuts Included:
No
Guideplates Included:
No
Valve Cover Mounting Style:
Stock
Accessory Bolt Holes Drilled:
Yes
Intake Valve Angle:
15
Exhaust Valve Angle:
15
Valve Guides Included:
Yes
Valve Seats Machined:
Yes
Cylinder Head Color:
Natural
Finish:
Natural
Steam Holes Drilled:
No
Machined for O-Ring:
No
Heat Crossover:
No
Remanufactured:
No
Quantity:
Sold individually.
Chevrolet Performance LS9 CNC-Ported Cylinder Heads
Chevrolet Performance LS9 CNC-ported cylinder heads represent a new benchmark in factory engineering high performance, blending the strength and durability of the production LS9 cylinder head castings with the airflow enhancements of precision CNC porting. The result is about 10 percent more efficiency than the production casting, while delivering the greater strength built into the LS9--Rotocast from super-strong A356T6 aluminum alloy. With the Rotocasting method, the mold rotates to more evenly distribute the molten alloy, creating a denser casting that virtually eliminates porosity. And compared to the similar LS3 heads, Chevrolet Performance LS9 CNC-ported cylinder heads feature reinforced webbing and a thicker deck for greater rigidity and minimal distortion. The A356T6 alloy also manages the higher heat of a forced engine more effectively. The heads come fully assembled with production, lightweight titanium intake valves, sodium-filled exhaust valves, and strong beehive-type valve springs that can handle up to .570 in. lift and can be installed on any LS engine with at least a 4.000 in. bore using standard 11mm head bolts.
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Some parts are not legal for use in California or other states with similar laws / regulations
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