EJCP.PARTS

GM 5.7 L31

The Vortec 5700 L31 (Vin code 8th digit "R") is a V8 truck engine. Displacement is 5.7 L. It is the last production Generation I small-block from Chevrolet. The cylinder heads feature combustion chambers and intake ports very similar to those of the LT1 V8, but without the reverse-flow cooling. As such, the L31 head is compatible with all older small-blocks, and is a very popular upgrade. It offers the performance of more expensive heads, at a much lower cost. It does, however, require a specific intake manifold (A 5.7L, 350 CI L31, Vortec engine has eight bolts attaching the intake manifold or four per head, as opposed to the traditional six bolts per head twelve in total found on older Chevrolet small blocks). The L31 was replaced by the 5.3 L 5300 LM7. The 2002 model year was the final year for the L31 5.7 L small block V-8 whose origins date back to 1955. The Vortec 5700 produces 255 hp (190 kW) to 350 hp (261 kW) at 4600 rpm and 330 lb·ft (447 N·m) to 350 lb·ft (475 N·m) of torque at 2800 rpm. It is currently being produced as a crate engine for marine applications and automotive hobbyists as the 'RamJet 350' with minor modifications. Known as the GEN 1+, this was the final incarnation of the 1955-vintage small block, ending production in 2005 with the last vehicle being a Kodiak/Topkick HD truck. Volvo Penta and Mercury Marine still produces the L31. The "MARINE" intake is a potential upgrade for L31 trucks despite its cast iron construction. Using this "MARINE" intake will allow the use of common types of Bosch-style injectors with various flow rates while still maintaining emission compliance. L31 applications:[WIKI]

SIZES BLOCK MATERIAL HEAD MATERIAL CAM TYPE FUEL SYSTEM
5.7 CAST IRON CAST IRON OHV 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
5.7 OHV 96-99 SILVERADO SIERRA TAHOE YUKON SUBURBAN
96-00 2500-3500 VAN
99-00 ESCALADE
5.7A 5.7A ***** ***********
5.7 OHV 01-02 VAN 5.7B 5.7B ***** ***********

VALVE INFORMATION

MAKE MODEL YEAR RANGE
BUICK ROADMASTER 1994-1996
CADILLAC ESCALADE 1999-2000
CADILLAC FLEETWOOD 1994-1996
CHEVROLET CORVETTE 1994-1996
CHEVROLET/GMC ASTRO/SAFARI 1996-2005
CHEVROLET/GMC BLAZER/JIMMY 1996-2005
CHEVROLET/GMC 1500 1996-1999
CHEVROLET/GMC 2500 1996-2000
CHEVROLET/GMC 3500 1996-2000
CHEVROLET SUBURBAN 1996-2000
CHEVROLET/GMC TAHOE YUKON 1996-2000
CHEVROLET/GMC EXPRESS/SAVANA 1996-2014
CHEVROLET IMPALA 1994-1996
CHEVROLET/GMC S10 SONOMA HOMBRE 1996-2004
PONTIAC FIREBIRD CAMARO 1994-1997
TYPE HEAD DIAMETER STEM DIAMETER O.A.L. GROOVES LOCATION
EXHAUST 38.1 8.7 125 1 *GM43AU
INTAKE 49.3 8.7 124 1 *GM43AU

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