Vortec 5.7L V8 (L31) Engine Specs

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Vortec 5.7L V8 (L31) Engine Overview

This Vortec 5.7L V8 (L31) Engine is included on the 1st generation of small block from Chevrolet, this engine is the last production of this 1st generation. It using cast iron for the cylinder head and cylinder block material. The configuration of this engine is using V8 cylinder configuration with displacement specs reach 5733 cc. This Vortec 5.7L V8 (L31) Engine cylinder 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. This engine is produce to be the successor of previous engine code name LM7, The production of this Vortec 5.7L V8 (L31) Engine start from 1955 then stopped at 2002. For that long period of service the Vortec 5.7L V8 (L31) Engine can be use for marine applications and utomotive hobbyists as the “ramjet 350″ with minor modifications

Vortec 5.7L V8 (L31) Engine Specs

Here they are the detailed data of Vortec 5.7L V8 (L31) Engine Specs

Specs Item Specs
Engine Type Vortec 5.7L V8
Engine Code L31
Engine Electronic integrated into the dual microprocessor PCM
Displacement 5,733 cc (350 cu in)
Transmission Type 5 speed manual , 4 speed auto
Compression Ratio 9.4:1
Bore and Stroke (in.) 4.00 x 3.48
Valve configuration (pcs) two valves per cylinder
Valve Lifters Hydraulic Roller
Champ type Chain
Fuel System multi-point fuel injection
Recommended Fuel Unleaded Fuel 87 octane
Emissions controls evaporative system

catalytic converter

positive crankcase ventilation

return less fuel system

Maximum engine speed 5500
Horsepower(SAE net@rpm) GVWR under 10,000 lbs 255 hp @ 4600 rpm , GVWR under 10,000 lbs 250 hp @ 4600
Torque (lb. ft. @ rpm) 330 @ 2800
Intake Manifold  Material composite
Exhaust manifold Material high silicon molybdenum

cast nodular iron

Engine block material Cast Iron
Cylinder head material Cast Iron
Features high-flow cylinder heads,

new camshaft

roller valve lifters

Vortec 5.7L V8 (L31) Engine Applications

This Vortec 5.7L V8 (L31) Engine is use for following vehicles applications

  • 1996–2003 Chevrolet Express/GMC Savana full-size vans
  • 1996–1999 Chevrolet/GMC C/K full-size trucks
  • 1996–1999 Chevrolet Suburban/GMC Suburban full-size long-wheelbase SUVs
  • 1996–1999 Chevrolet Tahoe
  • 1996–1999 GMC Yukon (and 2000 Tahoe Limited) full-size short-wheelbase SUVs
  • 1999–2000 Cadillac Escalade

Vortec 5.7L V8 (L31) Engine

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12 Thoughts on “Vortec 5.7L V8 (L31) Engine Specs

  1. Lincoln on July 21, 2012 at 11:48 pm said:

    Y’all have great site!

    Just trying to find out the weight in pounds of the chevy tahoe 5.7L (350) 255 hp engine?
    - alos the weight of automatic transmission 4L60?

    Do you know these numbers?

    Thanks.

    • Hi Lincoln,
      thanks for your comment and asking
      we’ll try to answer your question
      - the weight of those engine is about 360 lbs.
      - while for 4L60 transmission as following detail
      Transmission Weight Dry (Approximate)
      298 mm Converter
      70.5 kg (155.70 lb)

      Transmission Weight Wet (Approximate)
      298 mm Converter
      80.5 kg (176.16 lb)

      thanks

  2. I have a silverado with this engine, I want to know if its possible to change the engine for a LQ9 or a L76, I mean do they fit?
    I just want some more power, my truck has 180k km, I do not think it is convenient to tune my engine up, I think that a bigger engine would work fine; your thoughts?

    • Hi Rafe,
      if you are only want to increase your truck power,
      you may try some little action before going to engine swapping, such as
      enlarge the cylinder diameter
      improve your fuel engine system
      or you can change your engine block only with larger engine capacity
      hope will get what you’ve targeted

  3. clint on August 7, 2013 at 6:40 am said:

    can I put headers and do away with the catalytic converter

  4. Can I and would it help to put different heads on my L31 that has 100,000 mi. On it.
    Looking to get more go out of this engine in a Tahoe.
    Already did a cold air intake, exhaust, air intake flow resistor, hot coil.
    Any suggestions.

    • yes, you can do it
      but need to check first the dimension of those heads compare to the cylinder block
      and surely do adjusment when needed

  5. Your best bet would be aluminum vortec heads. GM uses them on 604 Crate engines. They are awesome and will support enough airflow for 500HP. If u need some I keep 10-20 sets in shop for Certified Crate Engine rebuilds.

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  9. Hi,
    I’ve got a 2002 Workhorse that uses the V8 5.7L L31 engine. It’s a VIN R & we’re having trouble getting the timing right. When #1 is TDC, the marks are 180 off (top at 12 & bottom at 12). Is there some thing we missed? We just got done changing the head gaskets & the timig belt was due for a replacement too.
    Thanks!

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