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Chevrolet Performance 12530283

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

Chevrolet Performance 12530283

809-12530283

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Chevrolet Performance 12530283 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

    Fitment Notes: 

    This engine is not intended for marine use.

    Specifications:

    Engine Assembly Style
    Long block
    Engine Balance
    Internal/External
    Assembled
    Yes
    Cylinder Heads Included
    Yes
    Crate Engine Cylinder Head Material
    Cast iron
    Intake Manifold Included
    No
    Carburetor Included
    No
    Distributor Included
    No
    Throttle Body Included
    No
    Oil Pan Included
    Yes
    Timing Cover Included
    Yes
    Water Pump Included
    No
    Harmonic Balancer Included
    Yes
    Valve Covers Included
    Yes
    Flexplate Included
    No
    Flywheel Included
    No
    Air Cleaner Included
    No
    Spark Plugs Included
    No
    Spark Plug Wires Included
    No
    Computer Included
    No
    Wiring Harness Included
    No
    Rear Main Seal Style
    1-piece
    Quantity
    Sold individually
    Manufacturer's Part Number:
    12530283


    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!

    Specifications:
  • *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 English threads. When used for 2001 and newer vehicles, must also use 2000 model year starter/transmission/engine mounting bolts.

  • 12530283 - Chevrolet Performance 1996-2000 Truck 350ci L31-R Long Block Crate Engines & Install Kits is rated 5.0 out of 5 by 7.
    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
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    • clientName_jegs

    Need clarification on an earlier answer about mechanical fuel pump use. Picture clearly shows a fully-machined fuel pump boss. And specs indicate it is based on the 1986-2000 block. Mechanical pump was still used with carb applications at that time.

    Asked by: Mike SW
    No there was manly different block casting during that time period, 86 was the last year for the 1500 to have used a carburetor. It is based on the late 880 block casting (96+). The issue is the block is not drilled for the fuel pump pushrod anymore by gm because they are expected to be used as a stock replacement for Vortec spyder injection trucks.
    Answered by: BrandonJ
    Date published: 2017-12-07

     Will this work with a mechanical fuel pump 

    Asked by: Bkavlie
    This engine does not have a provision for a mechanical fuel pump.
    Answered by: Jon Jegs Tech
    Date published: 2017-11-25

    what is hp please

    Asked by: bkavl
    This has 255hp @4600
    Answered by: Dean R
    Date published: 2017-11-23

    Also if I wanted a high performance camshaft, would you have one for this application that would increase performance and not void warranty?

    Asked by: Chaitzo
    I am sorry, any cam swaps will void the gm warranty.
    Answered by: BrandonJ
    Date published: 2017-11-15

    Is this the correct replacement engine for a 1999 Chevy 3500 Wt model long wheel base

    Asked by: chris17
    Yes, this engine should work in your application.
    Answered by: Rusty B
    Date published: 2017-11-14

    Will this engine fit in my 1997 Sierra vortec V8 K1500 and use everything else bolted right on? I want a 4 bolt main to replace the stock engine, but the description says the engine only works in 3/4 and 1 ton trucks. Why is that? Wouldn't it fit in mine?

    Asked by: Chaitzo
    This should fit your application, originally the 5.7 wasn't offered in the 1/2 ton truck in that year.
    Answered by: Rusty B
    Date published: 2017-11-13

    will this engine bolt up to a 1992 nv 4500 transmission ???

    Asked by: donmaine
    Yes, assuming this transmission is from a Chevrolet application.
    Answered by: Rusty B
    Date published: 2017-11-01

    core fee, if so does core have to be similar L31R engine, or will a TBI engine work

    Asked by: Greens
    There is no core charge.
    Answered by: BrandonJ
    Date published: 2017-11-29
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