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Chevrolet Performance LS9 Cylinder Heads for 2009-2013 CORVETTE - 12621773
Part Number: NAL-12621773
Chevrolet Performance LS9 Cylinder Heads
CYLINDER HEAD
See More Specifications
Estimated Ship Date: Oct 30, 2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
12621773
Part Type:
Product Line:
Summit Racing Part Number:
NAL-12621773
UPC:
00195491257955
Combustion Chamber Volume (cc):
68
Intake Runner Volume (cc):
259cc
Exhaust Runner Volume (cc):
89cc
Cylinder Head Style:
Bare
Cylinder Head Material:
Cast aluminum
Intake Port Shape:
Rectangular
Intake Valve Diameter (in.):
2.165 in.
CNC-Machined Combustion Chamber:
No
CNC-Machined Intake Runner:
No
CNC-Machined Exhaust Runner:
No
Exhaust Port Shape:
D-port
Spark Plug Style:
Angle
Intake Valves Included:
No
Exhaust Valves Included:
No
Exhaust Valve Diameter (in.):
1.590 in.
Valve Springs Included:
No
Damper Spring Included:
No
Retainers Included:
No
Locks Included:
No
Valve Stem Seals Included:
No
Rocker Arm Studs Included:
No
Rocker Arms Included:
No
Rocker Arm Nuts Included:
No
Guideplates Included:
No
Accessory Bolt Holes Drilled:
No
Valve Guides Included:
No
Valve Seats Machined:
No
Cylinder Head Color:
Natural
Steam Holes Drilled:
No
Machined for O-Ring:
No
Heat Crossover:
No
Remanufactured:
No
Quantity:
Sold individually.
Chevrolet Performance LS9 Cylinder Heads
Chevrolet Performance LS9 cylinder heads can be installed on any LS engine with at least a 4.000 in. bore using standard 11mm head bolts. The LS9, of course, was the supercharged engine in the C6 Corvette ZR1. To support the higher combustion pressure and temperature that come with forced induction, the heads were produced with a unique Roto-cast method in super-strong A356T6 aluminum alloy. With the Roto-cast method, the mold rotates to more evenly distribute the molten alloy, creating a denser head casting that virtually eliminates porosity. And compared to the similar LS3 head, the LS9 features 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. These bare engine cylinder heads are designed, engineered, and tested to rigorous standards, and are backed by General Motors. The replacements are the true OE parts installed during the production of or validated by GM for select vehicles.
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Instructions & Calculators
Some parts are not legal for use in California or other states with similar laws / regulations
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