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MSRP

$5,607

Part No.

12499101

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STREET

6 Select
Available Mods

Power

Power
340
hp @ 4500 rpm

Extra cubic inches deliver greater torque for your truck

Got a pre-1980 GM truck with a tired Small-Block? Forget the rebuild or reconditioned used engine and take your trusty truck’s capability to the next level with our big-torque HT383 stroker crate engine.

Its extra displacement and unique parts are designed to build a wide, flat torque curve that hits the 400-lb-ft mark by 2500 rpm and doesn’t dip below it through the 4000-rpm peak (435 lb-ft). It also makes 340 horsepower. That’s power and torque you simply won’t get with a stock-type rebuild.

The HT383 features a brand-new engine block with four-bolt mains — an upgrade for most production engines that came with two-bolt mains — along with a forged steel crankshaft and a smooth hydraulic roller camshaft. Its 9.1:1 compression ratio allows it to run on regular unleaded gasoline, too.

We deliver the HT383 with an aluminum intake manifold, ready for you to swap over the accessories from your tired engine. It’s also backed by a 24-month/50,000-mile (80,000-km) limited warranty.

HT383 DYNO

Click on the slider to see the torque and power ratings change with rpm.*

*Approximate values shown.

HT383 TECH SPECS

Part Number:
12499101
 
 
Engine Type:
Chevy Small-Block V-8
Displacement (cu. in.):
383
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
Balanced:
External
Valve Size (in.):
1.940 intake / 1.500 exhaust
Compression Ratio:
9.1:1
Rocker Arms (P/N 10089648):
Stamped steel
Rocker Arm Ratio:
1.5:1
Water Pump (P/N 88894341):
Cast-iron
Recommended Fuel:
87 octane
Ignition Timing:
Base 10° BTDC, 32° Total
Maximum Recommended rpm:
5000

OWNER RESOURCES

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 Crate Engines Installation

    INSTALLATION NOTES

    • Requires addition of carburetor, ignition, and starter (not included)
    • Rochester Quadrajet or Holley 770-cfm carburetor recommended
    • Comes with 12.75-inch externally balanced 153-tooth automatic transmission flexplate. Requires externally balanced flywheel for manual transmission
    • Has right-side oil dipstick
    • Designed for pre-1976 street vehicles or any off-road vehicle
    • Not intended for marine applications
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FINISH OFF YOUR CRATE ENGINE WITH THESE SELECT PARTS

Download a catalog for a full listing of components and related parts.

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

Transmission Controller • P/N 19212657

Carburetor, Holley 670-cfm • P/N 19170092

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

HEI Distributor • P/N 93440806

Lightweight Starter (remanufactured) • P/N 10465143

  • 1 1 Whichever comes first. See dealer for warranty details.
  • 2 Performance MSRP The Manufacturer's Suggested Retail Price excludes tax, shipping and installation.
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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.