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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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$2,069.99
$1,899.99
ON SALE - $170.00 OFF
Chevrolet Performance 12530283 5.7L/350ci L31 Long Block Crate Engine with Vortec Heads for GM Trucks/Vans $1,899.99
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.

    Specifications:

    Engine Make/Size
    Chevy Small Block
    Engine Assembly Style
    Long block
    Engine Balance
    Internal/External
    Assembled
    Yes
    RPM Power Range
    Idle-5000
    Horsepower
    250
    Cylinder Heads Included
    Yes
    Crate Engine Cylinder Head Material
    Cast iron
    Camshaft Style
    Hydraulic roller tappet
    Intake Manifold Included
    No
    Carburetor Included
    No
    Throttle Body Included
    No
    Distributor 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
    Emission
    Not Legal
    CARB EO Number
    N/A
    CARB EO Number
    N/A
    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 is rated 5.0 out of 5 by 8.
    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
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    Will this engine fit a 1968 camaro?

    Asked by: shamus
    It will fit, but is not recommended unless you have change out the transmission. We recommend the early small block Chevy applications that have a 2 piece rear main seal.
    Answered by: Rusty B
    Date published: 2018-04-14

    will this fit a 1977 corvette

    Asked by: jose56
    This will bolt into the '77 Corvette with minimal modifications.
    Answered by: Jon Jegs Tech
    Date published: 2018-04-19

    Where can I find engine specs for bolt torque and the like? This engine didn't come with a manual or information of any kind

    Asked by: chefk85
    This will use all of the factory torque specifications for the small block Chevy engine in 1996-2000 Chevrolet/GMC Pickup (CK2,CK3)
    Answered by: Rusty B
    Date published: 2018-04-05

    Will this engine fit a 2001 silverado 5.3 with engine code T 

    Asked by: David 1962
    This is not made to fit that application, Please call our tech line for assistance 1-800-345-4545 ext 2001
    Answered by: Rusty B
    Date published: 2018-04-05

    Is this the correct motor to replace 1998 GMC K2500 5.7

    Asked by: Fireman 108
    Yes, this is the correct engine.
    Answered by: Rusty B
    Date published: 2018-04-03

    Is this motor a 4 bolt main

    Asked by: Fireman 108
    This is a 4 bolt 1 piece rear main block.
    Answered by: Dean R
    Date published: 2018-03-31

    What gas do you recommend for this engine, for peak performance.

    Asked by: Sleepypete
    Originally this engine was designed to work fine on 87 octane. With the poor quality of modern fuels you'll have to try different gas locally to see what it likes best, some customers still use 87 just fine while others get better results from mid-grade or premium.
    Answered by: Matt_B
    Date published: 2018-03-31

    Are the valve stems on the exhaust valves 3/8" ? Some descriptions of this motor say that they are but nobody seems to mention that when discussing upgrading valve springs and retainers to increase lift on the Vortec heads without machining.

    Asked by: Abdula
    These heads will have an 11/32" valve shown as .344 in some manuals.
    Answered by: Rusty B
    Date published: 2018-03-31
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