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Chevrolet Performance 5.7L/350ci L31 Long Block Crate Engine with Vortec Heads for GM Trucks/Vans

Chevrolet Performance 12530283


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Chevrolet Performance 5.7L/350ci L31 Long Block Crate Engine with Vortec Heads for GM Trucks/Vans $2,069.99
L31 HD Engine
  • Vortec 64cc Cylinder Heads
  • 1996-2002 Chevrolet Express/GMC Savana (G2,G3)
  • 1996-2000 Chevrolet/GMC Pickup (CK2,CK3)
  • 1996-2000 GMC Suburban (CK2,CK3)
  • 1996-1999 Chevrolet/GMC Chassis (P3)
  • 3/4 and 1-Ton only

  • Chevrolet Performance 12530283 Details

    L31 HD Base Engine

    3-Year/100,000-Mile Warranty, some exclusions may apply 

    Fitment Notes: This engine is not intended for marine use.


    Engine Make/Size
    Chevy Small Block
    Engine Assembly Style
    Long block
    Engine Balance
    RPM Power Range
    Cylinder Heads Included
    Crate Engine Cylinder Head Material
    Cast iron
    Camshaft Style
    Hydraulic roller tappet
    Intake Manifold Included
    Carburetor Included
    Throttle Body Included
    Distributor Included
    Oil Pan Included
    Timing Cover Included
    Water Pump Included
    Harmonic Balancer Included
    Valve Covers Included
    Flexplate Included
    Flywheel Included
    Air Cleaner Included
    Spark Plugs Included
    Spark Plug Wires Included
    Computer Included
    Wiring Harness Included
    Rear Main Seal Style
    Sold individually
    Not Legal
    CARB EO Number
    CARB EO Number
    Manufacturer's Part Number:

    Free Shipping!

    The Chevrolet Performance Truck 350ci L31-R Long Block Assembly was designed as a direct replacement for 1996-2000 GM Full size Trucks and 1996 -2002 Full size Vans. This engine comes factory fresh, manufactured using the latest in high tech computer controlled equipment and are GM engineered, tested and validated to deliver smooth, dependable performance with a Limited 3 Year / 100,000 Mile warranty!


    • *1986-2000 style block, 4 bolt mains
    • 1pc rear seal nodular iron crankshaft
    • Powdered metal connecting rods
    • Hypereutectic pistons 9.4:1 compression Ratio
    • Hydraulic roller camshaft: Int Lift .414", Exh Lift .428", Int Duration @.050" 191, Exh Duration @ .050" 196, Lobe Centerline-111
    • Vortec cylinder heads - 64cc, 1.94'' intake valve, 1.50'' exhaust valve
    • Also includes: Oil pan, timing cover, valve covers, harmonic balancer

      JEGS Easy Kits are designed by JEGS high performance racing professionals to help you get all the performance parts you need for your race car, hot rod or truck.

      GM Warranty

      Note: *Service engine block contains SAE threads. When used for 2001 and newer vehicles, must also use 2000 model year starter/transmission/engine mounting bolts.

    12530283 is rated 4.9 out of 5 by 9.
    Rated 5 out of 5 by from great got this to replace a 172K mile motor and put it in my toy, run great, purrs like a tiger !
    Date published: 2018-04-06
    Rated 5 out of 5 by from Flawless I purchased for my 99 suburban to replace a 300k L31 vin code R. Went in smooth no issues started first turn of the key. I have 500 miles on it just did a oil change zero issues. This is my 2nd motor I have purchased both are awesome other one has 15k miles on it. These are brand new not rebuilds and I highly recommend this motor
    Date published: 2017-10-25
    Rated 5 out of 5 by from 1996-2000 Chevy 5.7 4-bolt Installed in my Chevy Silverado 3 weeks ago and it's running like a champ. Super satisfied with this purchase.
    Date published: 2016-11-03
    Rated 5 out of 5 by from Very Happy with service and product. There were a couple issues with initial purchase approval but there was good communication with "real people" that made it all work out. The engine arrived VERY well crated. It was put in the truck and has been running perfectly every day for last couple weeks. Mechanic was so impressed he is recommending others to buy from JEGS.
    Date published: 2015-02-19
    Rated 5 out of 5 by from Great Products I purchased this L31-R 350ci long block for my 1998 Chevy k1500 Z71 4x4. I was very pleased with the packaging. Since i don't have the vortex on it and being a high performance guy i was a little disappointed with the output horse power with my truck being a 4x4. other than that, i'm pleased with the engines smooth running and dependability. Over all very happy with my purchase. Thanks Jegs.
    Date published: 2015-01-06
    Rated 5 out of 5 by from fast service great product,driven everyday we had it in three days installed it ,started with no problems. it is driven everyday in a delivery truck Thank You Jegs for a great product
    Date published: 2014-12-28
    Rated 5 out of 5 by from Fast delivery and went in with no problems so far so good
    Date published: 2014-12-26
    Rated 4 out of 5 by from Good replacement engine Excellent choice to repower an older truck. Great price, fast shipping, no messing with sending a core back, just take out of crate, put your accessories on and drop in. My only concern was that this engine is apparently made entirely in Mexico and has it cast into block, not a big deal as long as it holds up over time but would like to have known up front. Im a buy made in the USA kind of guy if at all possible.
    Date published: 2018-07-05
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    Will this engine fit my 3/4 ton 85 scotsdale

    Asked by: Thoms
    No, you will need a 2 piece rear main seal engine like this - https://www.jegs.com/i/JEGS/059/7353/10002/-1
    Answered by: Rusty B
    Date published: 2018-08-14

    What’s the difference between this HD L31 for 3/4 & 1 ton only and the other L31 listed for my 98 K1500 suburban? They both are R motors shouldn’t they fit the same? Run the same? 

    Asked by: Moose goose
    The difference in these engines is that the HD series engine has 4 bolt mains and the standard engine has 2 bolt mains. Gm recommends the HD series for 3/4 and 1 ton applications and the the other engine for its 1/2 ton applications.
    Answered by: Rusty B
    Date published: 2018-08-07

    Is this a 5.7 vortex engine with a 4 bolt main? Will it replace a 5.0 vortex engine in a 1998 GMC Savanna cargo van ? 

    Asked by: Air Boss
    No, this is the engine you will want to use - https://www.jegs.com/i/Chevrolet-Performance/809/12681432/10002/-1
    Answered by: Rusty B
    Date published: 2018-08-03

    I own a 1990 GMC Serra K1500 4 Wh. Dr. will this engine match up and mate with truck and install as easy as the old block comes out ?

    Asked by: ABC 38
    No, but this will be a relative bolt in option https://www.jegs.com/i/ATK-Engines/059/HP31/10002/-1 or this as an OE option - https://www.jegs.com/i/ATK-Engines/059/VCM5/10002/-1
    Answered by: Rusty B
    Date published: 2018-07-31

    Do the exhaust valves in this engine have hard seat inserts?  Is the timing chain the single row roller?  

    Asked by: Jack75
    The valve seats in this engine are hardened and the timing change will be a stock style single row.
    Answered by: Rusty B
    Date published: 2018-07-30

    I have a 2006 Sierra 5.3L Would this be the right replacement engine, I would like to up the horse power a bit I tow a 20' boat what would you recommend

    Asked by: Mowdog
    You will need an LS3 engine to replace the one in your truck. We have this option - https://www.jegs.com/i/Chevrolet-Performance/809/19369326/10002/-1
    Answered by: Rusty B
    Date published: 2018-07-24

    Just making sure on application, I Have a 1998 GMC Suburban 2500 4wd Vin # 1GKGK26R3WJ------, Sure seems like correct replacement

    Asked by: Joe Chevy
    Yes, this would be the correct engine for your Chevy Suburban.
    Answered by: Rusty B
    Date published: 2018-07-12

    Is this a good choice for my '91 V2500 3/4 ton 4wd Suburban?

    Asked by: ORSkier
    No, this is a better choice - https://www.jegs.com/i/Chevrolet-Performance/809/12681430/10002/-1
    Answered by: Rusty B
    Date published: 2018-07-06
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