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International Customer Options

Chevrolet Performance 350 C.I.D. L31-R Long Block Assemblies 12530283

Engine Assembly, Crate Engine, Chevy 350, L31-R, Truck/Van, 8,600 and over GVW, Each

Estimated USA Ship Date: Loading...Processing Tomorrow
Estimated International Date: Loading...Processing 4/16/2019
INTERNATIONAL Customer Options

  • This part is shipped via truck freight, additional shipping charges will apply. Multiple truck freight parts on an order may increase the shipping amount.

Brand: Chevrolet Performance

Manufacturer's Part Number: 12530283

Part Type: Crate Engines

Product Line: Chevrolet Performance 350 C.I.D. L31-R Long Block Assemblies

Summit Racing Part Number: NAL-12530283

Actual Engine Displacement: 5.7L/350

Engine Assembly Style: Long block

Crate Engine Cylinder Head Material: Cast iron

Assembled: Yes

Engine Balance: Internal/External

Cam Style: Hydraulic roller tappet

Rear Main Seal Style: 1-piece

Intake Manifold Included: No

Cylinder Heads Included: Yes

Carburetor Included: No

Throttle Body Included: No

Distributor Included: No

Oil Pan Included: Yes

Valve Covers Included: Yes

Timing Cover Included: Yes

Water Pump Included: No

Harmonic Balancer 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

Water Pump Style: Long

Quantity: Sold individually.

Notes: This fits 3/4 and 1 ton trucks, not 1/2 ton. For 3/4 and 1 ton trucks with the heavy duty option. 8,600 and over GVW. This engine is not designed, nor intended to be used in any marine applications. Engines installed in vehicles registered and normally operated outside of the United States carry no warranty. Block has no previsions for a mechanical fuel pump. No hole drilled for fuel pump driveshaft, and no eccentric on the camshaft for a mechanical fuel pump driveshaft.

In-Store Pickup: Choose In-store pick-up (OH, NV, GA, TX) on our web site.

Calculator CFM Calculator

Got a 1/2 ton, 3/4 ton, or other GM pickup with a tired, sick, or broken engine? Chevrolet Performance 350 c.i.d. L31-R long block assemblies are built up from 4-bolt main blocks with one-piece rear main seals. To this, Chevrolet adds a nodular-iron crankshaft, powdered-metal connecting rods, and hypereutectic aluminum pistons. You also get power-producing cylinder heads with 1.94 in. intake valves and 1.50 in. exhausts, and 64cc combustion chambers that yield a gas-pump friendly 9.4:1 compression ratio. This combination is paired up with a roller cam that has 0.414 in. of intake lift and 0.428 in. for the exhausts. Duration at 0.050 in. of lift is 191 degrees for the intakes and 196 for the exhausts, with 111 degrees of lobe separation. These engines come complete with an oil pan, timing cover, valve covers, and harmonic balancer. The long block assemblies are designed to fit 1996-2000 full size Chevy/GMC trucks and 1996-2002 Chevy/GMC full size vans.

Warranty

Questions & Answers
Q:

I know this is intended for 2500/3500 series, but is it otherwise a direct bolt-in for 1500 series that previously had the 5.7 L31 (2 bolt main)?

Right now the price difference is almost nothing, and i have a 1999 Suburban (had L31 5.7) that needs a new engine. If I'm not going to run into compatibility issues, I can't see why I wouldn't get this one.

Asked by MATT on November 19, 2017

A:

Yes works just fine. Just did the swap in a 2000 Z71 Tahoe. I did it for the four bolt main caps.

CLIFFORD J from CA answered on November 26, 2017

+See All Answers (6) Answer This Question

Q:

I would like to install this motor a 1970 2wd Chevy C30. A few questions, will the stock ex. manifolds match the vortec heads? Will I need to purchase a new fly wheel for the OE 4 sp tranny? Are heads drilled to accept a drivers side alternator? Thanks

Asked by DAVID on January 26, 2017

A:

The cam can be left alone and will work fine with a carburetor.

JONATHAN from AL answered on September 19, 2017

+See All Answers (5) Answer This Question

Q:

what is the rated horsepower and torque for this motor?

Asked by GARY on September 24, 2017

A:

About 290 hp with factory intake

CECIL from FL answered on October 01, 2017

+See All Answers (5) Answer This Question

Q:

will this fit in my 1993 4x4 chevy silverado k1500. looking for a new motor and transmission

Asked by JOSEPH on July 10, 2016

A:

No they have a different crate 350 for 95 and older this one is for 96 and newer it's a little bit different plus if u go with the other crate engine u will save your self a little bit of money just give summit a call and they will lead u to the right one

SHAWN from CA answered on July 23, 2016

+See All Answers (4) Answer This Question

+See All Questions (61)

Most Helpful Reviews Review This Product

44 Customer Reviews for Chevrolet Performance 12530283 - Chevrolet Performance 350 C.I.D. L31-R Long Block Assemblies

Average Customer Review

5 Star

(35)

4 Star

(4)

3 Star

(3)

2 Star

(0)

1 Star

(2)

+See All 44 Reviews

Summit deserves 5 stars GM deserves none

Summit RacingSummit Racing Verified Purchase

NAL-12530283
Summit got my crate motor to me without issue. RL carrier showed up on time, the driver helped me unload it and had a great attitude. Upon installation on the first startup it became painfully clear that my 2 week overland trip scheduled 3 days after the install would be cancelled as the engine suffered some catastrophic assembly error resulting in what appears to be plugged oiling galleys. Either from driving pipe plugs too deep into the block or contamination during assembly. I am currently working with the local dealer on the issue. They claim this is not a common problem and have consistently been unable to return my calls or give further instruction. The warranty insofar appears to be a paper tiger as it's been 5 days without any direction from GM. Will update review as results come in. ...read more

10 of 10 found this review helpful.

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Reviewer: from TX

Date: April 28, 2017

Appearance
Ease of Installation
Price/Value
Quality

Buyer beware

Summit RacingSummit Racing Verified Purchase

NAL-12530283
Started engine up and had knocking. Dealer pulled pan and had 3 loose rod caps and missing half of a rod bearing.

5 of 6 found this review helpful.

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Reviewer: from KY

Date: May 03, 2017

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Ease of Installation
Price/Value
Quality

Best engine for the money bar none.

Summit RacingSummit Racing Verified Purchase

NAL-12530283
Where else can you get a 4 bolt main block, a hydraulic roller cam, and vortec heads for this price. I got my new motor installed and I have about 2000 miles on it and I am well satisfied with the motor. It runs great and has a lot of power. The motor runs great and Summit is an excellent company to buy from.

3 of 3 found this review helpful.

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Reviewer: from NC

Date: November 28, 2016

Appearance
Ease of Installation
Price/Value
Quality

97 C1500

Summit RacingSummit Racing Verified Purchase

NAL-12530283
Truck has been my daily driver for a year now with the new motor no complaints assembled with all new components added headers with true duals motor runs great. diffidently would recommend for stock replacement.

3 of 3 found this review helpful.

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Reviewer: from FL

Date: April 06, 2015

Appearance
Ease of Installation
Price/Value
Quality

Chevrotet 350 C.I.D.L31 long Block

Summit RacingSummit Racing Verified Purchase

NAL-12530283
So Far so good it was shipped when they said it would be also arrived on time and sealed up.

3 of 3 found this review helpful.

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Reviewer: from CA

Date: August 06, 2014

Appearance
Ease of Installation
Price/Value
Quality

Some parts are not legal for use in California or other states with similar laws / regulations

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