EJCP.PARTS

GM LL8 4.2

Atlas is a name for a family of modern inline piston engines for trucks from General Motors, used in the GMT 355 and GMT360 platforms. The series debuted in 2002 with the Oldsmobile Bravada, and is also used in the Buick Rainier, the Chevrolet TrailBlazer and Colorado, the GMC Envoy and Canyon, the Hummer H3, Isuzu Ascender and i-370, and the Saab 9-7X. The engines use GM's Vortec name, and I4, I5, and I6 engines are all part of the same family, sharing the same manufacturing equipment, rods, pistons, valves, and other parts. They feature variable valve timing on the exhaust side, electronic throttle control, and a special oil pan with a pass-through for the half shafts in four-wheel drive vehicles. The inclusion of VVT on the exhaust camshaft side allows the Atlas series to meet emissions standards without the use of EGR, simplifying the engine design and increasing power for a broad power curve. The LL8 shares 75% of its components with the LK5 and L52; while the LK5 and L52 share 89% of their components.[1] The Atlas program began in 1995 along with the planning for GM's next-generation mid-size SUVs and pickup trucks. These vehicles were designed around the I6 engine. The I6 version was used in a Baja 2000 racing truck, winning its first race in a class that also included V8 engines. Another I6-powered truck won the truck class at the Pikes Peak International Hillclimb. The I6 Atlas engines were produced at the Flint Engine South plant in Flint, Michigan, while the I4 and I5 versions were produced at the Tonawanda Engine plant in Tonawanda, New York, near Buffalo.[WIKI]

SIZES BLOCK MATERIAL HEAD MATERIAL CAM TYPE FUEL SYSTEM
4.2 ALUMINUM ALUMINUM DOHC MPFI

ITEMS

BRACKETS EXHAUST MANIFOLD INTAKE MANIFOLD OIL PAN PISTON
SENSORS TIMING COVER TIMING SET VALVE COVER VALVE INFORMATION

LISTING TEMPLATES

SIZES COMPATABILITY ENGINE TEMP HEAD TEMP CRANK TEMP NOTES
4.2 DOHC 02 BRAVADA ENVOY TRAILBLAZER 4.2E 4.2A ***** MN2 MS2 MW2
4.2 DOHC 03-04 BRAVADA ENVOY ASCENDER RAINIER TRAILBLAZER 4.2B 4.2A ***** MU2 NAA
4.2 DOHC 05 ENVOY ASCENDER RAINIER 9-7X TRAILBLAZER 4.2A 4.2A ***** NBP
4.2 DOHC 06-07 ENVOY ASCENDER RAINIER 9-7X TRAILBLAZER 4.2C 4.2C *****
4.2 DOHC 08-09 ENVOY TRAILBLAZER 9-7X
08 ASCENDER
4.2D 4.2D ***** NNA

VALVE INFORMATION EARLY

MAKE MODEL YEAR RANGE
BUICK RAINIER 2004-2005
CHEVROLET COLORADO 2004-2006
CHEVROLET TRAILBLAZER 2002-2005
GMC CANYON 2004-2006
GMC ENVOY 2002-2005
HUMMER H3 2006
ISUZU I-280 2006
ISUZU I-350 2006
OLDSMOBILE BRAVADA 2002-2004
SAAB 97X 2005
TYPE HEAD DIAMETER STEM DIAMETER O.A.L. GROOVES LOCATION
EXHAUST 30.5 5.95 107.8 3 *GM28CU
INTAKE 37 5.96 105.4 3 *GM28CU

VALVE INFORMATION LATE

MAKE MODEL YEAR RANGE
BUICK RAINIER 2006-2007
CHEVROLET COLORADO 2007-2012
CHEVROLET TRAILBLAZER 2006-2009
GMC CANYON 2007-2012
GMC ENVOY 2006-2009
HUMMER H3 2007-2010
HUMMER H3T 2009-2010
ISUZU ASCENDER 2007-2008
ISUZU I-290 2007-2008
ISUZU I-370 2007-2008
SAAB 97X 2006-2009
TYPE HEAD DIAMETER STEM DIAMETER O.A.L. GROOVES LOCATION
EXHAUST 333.5 5.95 107.8 3 *GM29AU
INTAKE 38.6 5.96 105.5 3 *GM29AU

2002-2005 CAMSHAFT POSITION SENSOR

2006-2007 CAMSHAFT POSITION SENSOR

2008-2009 CAMSHAFT POSITION SENSOR

2002-2007 CRANKSHAFT POSITION SENSOR

2008-2009 CRANKSHAFT POSITION SENSOR

2002-2004 CAM PHASER EXHAUST

2005 CAM PHASER EXHAUST

2006-2007 CAM PHASER EXHAUST

2008+ CAM PHASER EXHAUST

POWER STEERING BRACKET

IDLER PULLEY BRACKET

SECONDARY AIR CHECK VALVE
IF NOT PRESENT WILL BE A BLOCK OFF PLATE ON HEAD

2006-2009 COIL

2002-2005 COIL

2002-2004 TIMING COVER
O-RING SEAL
NEED TO DEFINE DIFFRENCE

2005-2009 TIMING COVER
FLAT SEALING
NEED TO DEFINE DIFFRENCE