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hp @4200 rpm

A high-torque direct replacement for 1996-99 GM full-size trucks and SUVs

The Chevrolet Performance HT383E crate engine is an affordable and more powerful emissions-legal# direct replacement for the tired 350 engine in your 1996-99 full-size GM truck or SUV. The larger displacement delivers up to 10 percent more horsepower and more usable torque for effortless towing. It is extra power you won’t get with a stock-type rebuild or reconditioned used engine.

The HT383E is designed to replace the L31 5.7-liter engine in half-ton models of the Silverado, Suburban, Tahoe, Sierra, and Yukon. You simply swap the intake manifold, throttle body, exhaust manifolds, and other accessories from your old 350 onto the HT383E and install it in your truck with no further modifications.

The engine uses a brand-new four-bolt main block, a forged steel crankshaft, a smooth roller camshaft, and durable iron Vortec heads, helping it deliver the dependable power you expect from the venerable Small-Block V-8. It even comes with a new distributor, water pump, and other components that would be replaced during a rebuild.

#This engine is not emissions-legal in CA or states that have adopted CA emissions regulations


Part Number:
Engine Type:
Chevy Small-Block V-8
Displacement (cu. in.):
Bore x Stroke (in.):
4.000 x 3.800
Block (P/N 88962516):
Cast-iron with four-bolt main caps
Crankshaft (P/N 12489436):
4340 forged steel
Connecting Rods (P/N 12497624):
Heavy-duty PM steel
Pistons (P/N 12499103):
Hypereutectic aluminum
Camshaft Type (P/N 14097395):
Hydraulic roller
Camshaft Lift (in.):
.431 intake / .451 exhaust
Camshaft Duration (@.050 in.):
196° intake / 206° exhaust


Cylinder Heads (P/N 12558060):
Vortec iron; 64-cc chambers
Valve Size (in.):
1.940 intake / 1.500 exhaust
Compression Ratio:
Rocker Arms (P/N 10089648):
Stamped steel
Rocker Arm Ratio:
Water Pump (P/N 88894341):
Recommended Fuel:
87 octane
Maximum Recommended rpm:


Already own one, but lost some of the paperwork? We’ve got you covered with downloads and links for some of the more important documents below. You’ll find everything from the vital data about your engine’s capabilities to how to install it into your build, even all of the warranty information should you need to make a claim. And don’t forget, the best way we can make sure to get you the latest information on your specific part is to tell us which one you have by registering your engine. No matter what stage of your build you’re in — from shopping for the right part to that part having turned in a few miles — we have the information you need.

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  • HT 383 E Crate Engines Installation


    • Requires the reuse of the stock intake manifold, wiring harness, and fuel injection system
    • Due to calibration variances between half-, three-quarter-, and one-ton vehicles, this engine is designed for half-ton trucks and SUVs only
    • Comes with 12.75-inch externally balanced 153-tooth automatic transmission flexplate. Requires externally balanced flywheel for manual transmission
    • Has right-side dipstick
    • Not available as a partial
    • Performance recalibration of engine control unit (ECU) will significantly increase torque and horsepower
    • This engine is not emissions-legal in CA or states that have adopted CA emissions regulations
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Download a catalog for a full listing of components and related parts.

Hydra-Matic 4L65-E Four-Speed Automatic
Transmission • P/N 19260380

Serpentine Accessory Drive System • P/N 12497698

Transmission Controller • P/N 19212657

Aluminum Black Crinkle Valve Covers, Center Bolt
Design • P/N 12497979

Lightweight Starter (remanufactured) • P/N 10465143

Roller Rocker Arm Set, 1.5:1 Ratio • P/N 12370838

  • 1 Performance MSRP The Manufacturer's Suggested Retail Price excludes tax, shipping and installation.

Destination Freight Charges

To allow you to do an accurate price comparison with prices featured on other Internet sites, GM provides Internet pricing both with and without the Destination Freight Charge (see prices including Destination Freight Charge below). To get full pricing details, go to our Build Your Own section.