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Chevrolet Performance 12499101 HT383 Crate Engine

Brand: Chevrolet Performance

Part Number: 12499101


The product's part number has been discontinued.

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HT383 Chevy Performance Truck Crate Engine

340 hp @ 4,500 rpm/435 lb.-ft. @ 4,000 rpm


Big Torque for Your Truck

Got a pre-1980 GM truck with a tired Small Block? Forget the rebuild and take your trusty truck’s capability to the next level with the big torque Chevrolet Performance HT 383 crate engine. Its extra displacement and unique parts are designed to build a wide, flat torque curve that maintains at least 400 lb.-ft. between 2,500 and 4,000 rpm. That’s power you simply won’t get with a stock-type rebuild.

Built for true truck strength, this Chevy engine starts with a brand-new block with four-bolt main caps – a strength-enhancing feature most production truck blocks don’t have. We then fill the block with a forged steel crankshaft and a smooth hydraulic roller camshaft, then top it off with iron Vortec heads. Its 9.1:1 compression ratio is perfect for regular gasoline at all altitudes and engine loads.

Chevy Performance delivers the HT383 with an aluminum intake manifold, ready for you to swap over the accessories from your tired engine.


12499101 Chevrolet Crate Motor

HT383 Tech Specs:
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 4-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; 64cc chambers
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: 5,000
Balanced: External


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

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

Note: Distributor with melonized steel gear MUST be used with long-blocks and Partial engines with steel camshafts, or engine damage will occur.