EJCP.PARTS

GM 4.6 NORTHSTAR

The Northstar engine series of automobile engines was General Motors' most technically complex 90° V engine architecture. The family is most associated with Cadillac's Northstar V8, but the family has also seen use at Oldsmobile (as the Aurora L47 V8 and "Shortstar" LX5). The Oldsmobile variants went out of production in 2003, but the Northstar family did expand with longitudinal and 4.4 L supercharged versions. The Northstar name was used outside Cadillac as well, with Pontiac and Buick versions carrying that moniker. GM ceased production of the Northstar engine in July 2010. Production of the final cars to include the engine, the Cadillac DTS, Buick Lucerne, and Cadillac STS, ended in 2011.[1] Newer Cadillac V8 models like the CTS-V use the GM small-block OHV engine, marking a return to a simpler push rod engine design.[WIKI]

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

ITEMS

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

LISTING TEMPLATES L37

The L37 (VIN "9") was the original Northstar. It is tuned for responsiveness and power, while the later LD8 is designed for more sedate use. The L37 code had been used on all high-output transverse Northstars, even as the exact engine specifications evolved. Its displacement is 4600cc. The compression ratio for the L37 is 10.3:1 for engines built prior to 2000, and 10:1 for those built afterwards. The original L37 was specified at 290 hp (216 kW), but 1993 production examples were rated at 295 hp (220 kW). The engine topped out at 300 hp (224 kW) from 1996 through 2004 on the STS, DTS and ETC models, making these some of the most powerful domestic front wheel drive cars ever built.[citation needed] For 2005 the high output Northstar became Northstar NHP, and was downrated to 290 horsepower (220 kW) under the new SAE certified horsepower rating system. In 2006, the updated DTS "Performance Package" model got a slight bump to 292 hp (218 kW). Vehicles using the L37 include:[WIKI]

SIZES COMPATABILITY ENGINE TEMP HEAD TEMP CRANK TEMP NOTES
4.6 DOHC 93 ALLANTE
93-94 ELDORADO
94 SEVILLE DEVILLE
4.6B 4.6E ***** ***********
4.6 DOHC 95 ELDORADO SEVILLE 4.6E 4.6C ***** ***********
4.6 DOHC 96-99 DEVILLE ELDORADO
96-97 SEVILLE
4.6C 4.6C ***** ***********
4.6 DOHC 98-99 SEVILLE 4.6G 4.6C ***** ***********
4.6 DOHC 00 DEVILLE ELDORADO SEVILLE 4.6A 4.6B ***** ***********
4.6 DOHC 01-02 DEVILLE SEVILLE ELDORADO 4.6I 4.6B ***** ***********
4.6 DOHC 03 DEVILLE SEVILLE 4.6F 4.6F ***** KKA KLA KLB
SEVILLE STS ONLY
4.6 DOHC 04-05 DEVILLE
04 SEVILLE
4.6 4.6 ***** 04- JKA JLA
05- KKA KLA
4.6 DOHC 06-11 DTS
08-11 LUCERNE
4.6H 4.6A ***** 06-08 JKA JLA
08- JXA
07- KKA KLA

LISTING TEMPLATES LD8

The LD8 (VIN "Y") is a transverse V8 for front-wheel drive cars. Introduced in 1994, it is designed to provide more torque than the high-revving L37. The LD8 code had been used on all torque-tuned transverse Northstars, even as the exact engine specifications evolved. Compression ratio is 10.3:1 for engines built prior to model year 2000, and 10:1 for those built afterwards. The 1998 revision is quieter than previous Northstar engines, due to hydraulic engine mounts, and performs better due to a tuned intake system. Most LD8 Northstars are rated at 275 hp (205 kW) and 300 lb·ft (407 N·m).[WIKI]

SIZES COMPATABILITY ENGINE TEMP HEAD TEMP CRANK TEMP NOTES
4.6 DOHC 93-94 ELDORADO
94 SEVILLE DEVILLE
4.6A 4.6D ***** ***********
4.6 DOHC 95 ELDORADO SEVILLE DEVILLE 4.6B 4.6C ***** VIN Y ONLY
4.6 DOHC 96-99 DEVILLE ELDORADO
96-97 SEVILLE
4.6C 4.6C ***** SEVILLE SLS ONLY
96- JCA JDA
97- KCA KDA
98- JCB ADB JMA
99- KCA KCB KDA KDB KMA KMB
4.6 DOHC 98-99 SEVILLE 4.6D 4.6C ***** 98- JCB JDB JMA
99- KCA KCB KDA KDB KMA KMB
4.6 DOHC 00-02 DEVILLE SEVILLE ELDORADO 4.6E 4.6B ***** 00-02- JCA JMA JPA
01- KCA KCB KMA KMB KPA KPB
4.6 DOHC 03 DEVILLE SEVILLE 4.6F 4.6E ***** 03- KMA KMB KPA
4.6 DOHC 04-05 DEVILLE BONNEVILLE
04 SEVILLE
4.6G 4.6A ***** 04- BSK JMA JPA
05- KMA KPA
4.6 DOHC 06-11 DTS
08-11 LUCERNE
4.6H 4.6A ***** 06-08 JMA JPA
08- JWA
07- KMA KPA

LISTING TEMPLATES LH2

The Northstar was designed originally for transverse front-wheel drive applications. It was modified substantially in 2004 for longitudinal rear- and all-wheel drive use in the STS, SRX, and XLR, as well as receiving continuously variable valve timing on both intake and exhaust sides. The RWD (LH2) Northstar produces 320 hp (239 kW) and 315 lb·ft (427 N·m). An increased compression ratio of 10.5:1 enables most of the increase in power from the L37 and LD8 Northstars.[WIKI]

SIZES COMPATABILITY ENGINE TEMP HEAD TEMP CRANK TEMP NOTES
4.6 DOHC 04-05 SRX
05 STS
4.6A 4.6A ***** ***********
4.6 DOHC 04-05 XLR 4.6B 4.6A ***** FRONT COVER 12569092
JBA
4.6 DOHC 04-06 XLR 4.6C 4.6A ***** FRONT COVER 12584582
JBA
4.6 DOHC 06 SRX STSR ***** 4.6A ***** NOTE ELECTRIC OR MEC FAN
4.6 DOHC 07-09 SRX
07-10 STS
4.6D 4.6A *****
4.6 DOHC 07-09 XLR 4.6E 4.6A ***** KBA

VALVE INFORMATION EXAHUST EARLY

MAKE MODEL YEAR RANGE
CADILLAC ALANTE 1993
CADLILLAC DEVILLE 1994-1999
CADILLAC ELDORADO 1993-1999
CADILLAC SEVILLE 1993-1999
OLDSMOBILE AURORA 1995-1999
TYPE HEAD DIAMETER STEM DIAMETER O.A.L. GROOVES LOCATION
EXHAUST 29 5.9 90.5 1 *GM46BU

VALVE INFORMATION INTAKE EARLY

MAKE MODEL YEAR RANGE
CADILLAC ALANTE 1993
CADLILLAC DEVILLE 1994-1999
CADILLAC ELDORADO 1993-1999
CADILLAC SEVILLE 1993-1999
TYPE HEAD DIAMETER STEM DIAMETER O.A.L. GROOVES LOCATION
INTAKE 33.2 5.9 105.9 1 *GM46CU

VALVE INFORMATION INTAKE 2000-2009

MAKE MODEL YEAR RANGE
BUICK LUCERNE 2006-2009
CADILLAC DEVILLE 2000-2005
CADILLAC DTS 2006-2009
CADILLAC ELDORADO 2000-2002
CADILLAC SEVILLE 2000-2004
CADILLAC SRX 2004-2009
CADILLAC STS 2005-2009
CADILLAC XLR 2004-2009
OLDSMOBILE AURORA 2001-2002
OLDSMOBILE INTRIGUE 1999-2002
PONTIAC BONNEVILLE 2004-2005
TYPE HEAD DIAMETER STEM DIAMETER O.A.L. GROOVES LOCATION
INTAKE 36.2 5.9 112 1 *GM46BU

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