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GM Engines 12691672 - Vortec HD 350 L31 New Crate Engine

Free Shipping on Your Genuine GM engine from SDPC!

Nothing compares to a Factory Original new GM Crate Engines when it is time to replace the worn out 350ci Vortec engine in your 1996 thru 2002 Chevrolet or GMC pick-up and Vans. Part number 12681431 is the Heavy Duty replacement engine direct from GM Powertrain and fits most 3/4 and 1-Ton G-Series Vans, P-Series Trucks, Silverado's, Sierra's, and Suburban's. The Vortec HD version 350 uses a 4-Bolt main block, upgraded exhaust valves and cylinder heads for heavy duty applications. This engine is not intended for marine usage.

This engine features new components, brand new complete long block engine backed by a limited 3-year, 100,000 mile GM warranty when installed into an approved GM application. To verify your engine application, please contact our Tech Department with the VIN number from your vehicle or email your VIN info to our team.

Engine L31 Vortec HD 350 Chevy Engine
Horsepower 250HP @ 4600RPM
Torque 330FT/LBS @ 2800RPM
Compression Ratio 9.3:1
Block 4-Bolt Main, 1-Pc Seal, 4.000" Bore
Crankshaft Forged 1053 Steel, 3.480"
Heads Cast Iron; 64cc Vortec
Valves 1.940"/1.500"
Camshaft Lift 0.414"/0.428" Hydraulic Roller
Dur. @ 0.050" 191°/196°
Horsepower and Torque ratings are the original GM ratings from the most common application. Some year and model applications may differ slightly according to factory exhaust sytems, factory air intake systems, and other components.
Limited Supply
Availability: Hundreds of crate engines in stock! Same Day Shipping
Shipping: Free Shipping in the 48-States, 1 to 3 Day Delivery to Most Locations
Pricing: $4,080.95

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Special Notes
• Not Intended for Marine Usage

• All New Cylinder head and block castings
• Forged steel crankshaft
• All blocks are 4 bolt main
• All blocks are roller camshaft ready
• All blocks are mechanical fuel pump capable (Gen1e has no camshaft eccentric)
• Machined using precision CNC equipment
• Machined and assembled in the USA (Built in Springfield, MO of globally sourced parts).

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

Powerful Nationwide Warranty:
3 years/100,000 Mile Limited Warranty, whichever comes first. Our most common Parts Warranty offers coverage on the majority of our Genuine GM Parts service replacement parts. Contact seller for limited warranty part details, qualifications, and possible labor coverage.

Vehicle Fitment

California Proposition 65

California Prop 65WARNING: Cancer & Reproductive Harm -


  • 12691672
  • 12691672
  • 099998044844
  • Genuine GM Parts
  • Hundreds of crate engines in stock! Same Day Shipping
  • New


Shipping Information

  • Item Requires Shipping
  • 440.0 lbs.
  • W26.5000” x H28.0000” x L30.3000”
  • Free Shipping in the 48-States, 1 to 3 Day Delivery to Most Locations

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