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Kingman Speed®  |  SKU: KING-12638427-LS9
New arrival

Kingman Speed® GM LS9 Camshaft with LS7 Style Roller Lifters (LS1/LS2/LS7/LM7)

Regular price $399.99
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Description

COMPATIBLE: (5.3L/5.7L/6.0L/6.2L)

2004 - 2007 CADILLAC CTS-V

1998 - 2002 CHEVROLET CAMARO 

1997 - 2013 CHEVROLET CORVETTE 

1999 - 2013 CADILLAC ESCALADE

2001 - 2013 CHEVROLET AVALANCHE

1999 - 2013 CHEVROLET SILVERADO 1500 

2003 - 2006 CHEVROLET SSR

1999 - 2013 GMC SIERRA 1500 

2001 - 2013 CHEVROLET TRAILBLAZER

2003 - 2009 CHEVROLET EXPRESS

1999 - 2013 CHEVROLET SUBURBAN 

1999 - 2013 CHEVROLET TAHOE

2003 - 2009 HUMMER H2

2006 - 2010 HUMMER H3

1999 - 2013 GMC YUKON

1999 - 2013 GMC YUKON XL

2005 - 2006 PONTIAC GTO

2008 - 2010 PONTIAC G8

2008 - 2009 SAAB 9-7X AERO

1998 - 2002 PONTIAC FIREBIRD

The GM LS9 Camshaft paired with LS7-style roller lifters is a popular upgrade delivering roughly +50 to +60 horsepower on stock 5.3L and other Gen III/IV LS engines. It features mild street manners, excellent compatibility with boosted (turbo or supercharged) setups, and wide application fitment.

Part Number: Genuine GM #12638427 (LS9/ZR1 profile)

Advertised Power Gain: +50 to +60 HP at higher RPM ranges in stock 5.3L applications
Duration @ .050": 211° Intake / 230° Exhaust
Valve Lift: .562" Intake / .562" (or up to .588" depending on rocker ratio) Exhaust
Lobe Separation Angle (LSA): 122.5°
Idle Sound: Mild / slightly noticeable, maintaining great everyday street manners
Engine Fitment: Compatible with GM Gen III/IV small-block V8 engines including 4.8L, 5.3L (LM7, L59, L33), 5.7L (LS1, LS6), 6.0L (LQ4, LQ9), and 6.2L (LS3).
Lifters: Standard OEM-spec LS7-style hydraulic roller lifters designed for reliable high-RPM alignment and durability.
Michigan Motorsports +1
Supporting Upgrades: Often bundled with drop-in beehive valve springs (such as PAC-1218 rated for .600" lift) because factory truck springs cannot safely handle the increased lift.
Operational Trade-off: While it excels in peak horsepower and forced induction setups, expect a slight loss of low-end torque below ~4,500 RPM on smaller naturally aspirated 5.3L motors compared to factory truck cams

VEHICLE FITMENT