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HD 350 Engine – GM HD 350 Vortec L31 Crate Engine

$4,675.00

  • 1996-2002 GM Truck, SUV, Van
  • L31 HD Vortec 350 ci / 5.7L V8
  • 3/4-ton & 1-ton Applications
  • 4-Bolt Mains
  • Long Block
Due to world events we are working with our manufacturers every day to ship and receive parts. If the part you are looking for is time sensitive please give our team a call at 855-806-1147 before ordering to ensure it's availability.

Shipping is free, but there is a delivery fee for residential addresses.

GM HD 350 Vortec L31 Crate Engine

If you need a hard-working, heavy-duty engine for your 3/4 ton or 1-ton truck or van, this HD 350 Vortec will get the job done! This heavy-duty replacement engine provides the OE horsepower and torque specifications while adding high-quality durable internals for long-term reliability. With 330 lb. ft. of torque available at a low 2,800 RPM, this engine features:

  • All new cylinder head and block castings
  • Forged steel crankshaft
  • All blocks are 4 bolt main and roller camshaft ready
  • All blocks are mechanical fuel pump capable (Gen1e/L31 has no camshaft eccentric)
  • Machined using precision CNC equipment
  • Machined and assembled in the USA

What’s Included

  • No core charge
  • New valve covers, oil pan, timing cover, and harmonic balancer for less labor hours at your installer
  • GM OE part validation must comply with an 18 step quality process
  • Torque to turn over, compression & oil pressure tested at end of the line.

Important Notes

  • Weight: 465 lbs.
  • Brand: GM OE Engine
  • Manufacturer Part Number: 12691672
Weight 465 lbs
Brand

Emissions

Please share VIN and current mileage in order notes for warranty documentation (if applicable)

Manufacturer Part Number

12691672

GM HD 350 Vortec L31 Tech Specs

  • P/N: 12691672
  • Power: 250 hp @ 4,600 rpm / 330 lb.-ft. @ 2,800 rpm
  • Engine Type: Chevy Small-Block V-8
  • Displacement (cu. in.): 350
  • Bore x Stroke (in.): 4.000 x 3.480
  • Block: Cast-iron with 4-bolt main
  • Crankshaft: Forged steel
  • Connecting Rods: Powdered metal
  • Pistons: Hypereutectic aluminum
  • Valve Lift (in): .414 intake / .428 exhaust
  • Camshaft Duration (@.050 in): 191° intake / 196° exhaust
  • Cylinder Heads: Cast iron
  • Compression Ratio: 9.4:1 nominal
  • Balanced: External
  • 1996 GMC G3500
  • 1996 GMC K3500
  • 1996 GMC Savana 2500
  • 1996 GMC Savana 3500
  • 1996 GMC W3500 Forward
  • 1997 Chevrolet C2500 Suburban
  • 1997 Chevrolet Express 2500
  • 1997 Chevrolet K2500 Suburban
  • 1997 Chevrolet W3500 Tiltmaster
  • 1997 GMC P3500
  • 1997 GMC Savana 3500
  • 1997 GMC W3500 Forward
  • 1998 Chevrolet C2500
  • 1998 GMC C2500
  • 1998 GMC Savana 2500
  • 1999 Chevrolet C2500
  • 1999 Chevrolet Express 2500
  • 1999 Chevrolet Express 3500
  • 1999 Chevrolet K2500 Suburban
  • 1999 Chevrolet K3500
  • 1999 GMC Savana 3500
  • 1999 Isuzu Npr
  • 2000 Chevrolet C2500
  • 2000 Chevrolet Express 3500
  • 2000 Chevrolet K3500
  • 2001 Chevrolet Express 2500
  • 2001 Chevrolet W3500 Tiltmaster
  • 2001 Workhorse P30
  • 2002 GMC Savana 2500
  • 2002 GMC W3500 Forward

Chevrolet O.E. Replacement Crate Engines include a 36-month or 100,000-mile limited warranty when installed in proper applications. Contact us with your VIN or vehicle description to verify warranty.

Click here for more detailed warranty information.

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Prop65WARNING: These auto parts can expose you to chemicals including phthalates and lead. Installing or using these parts can expose you to other parts containing these chemicals and to engine exhaust, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.