Chevy HT383 Crate Engine

GMPP HT 383 engines are big inch engines made for stump pulling torque for pre 1970's Chevy and GMC trucks. Pulling boats and other trailers is no sweat with an HT 383 - Up hills or up the boat ramp, the HT383 gets it done over and over again. The HT383 has the quality you expect in a GM Performance crate motor with the same great warranty.

Pulling requires low end torque at low RPM's to make a V8 last. GMP put plenty of great parts inside to make the engine last. With 435 lb.-ft. of torque at 4000 rpm and 400 lb.-ft., trailer pulling makes this engine happy! HT 383 engines are packed with the 383 forged steel stroker crankshaft, HD connecting rods and hyper. pistons. HT 383 engine blocks are 4 bolt main versions for reliable strength.

Possible Applications

  • Pulling trucks
  • Older Suburbans
  • El Caminos you use for towing
  • big-block torque from a small bloick

*Applications have not been validated. They are merely suggestions of how you might enjoy your GM Performance Parts crate engine. Some applications may affect engine warranty. See specific warranty information. Some applications may not be emission legal; check state and local ordinances.

Part Number: 12499101
Engine type: Chevy small-block V-8
Displacement (cu in): 383
Bore x stroke (in): 4.00 x 3.80
Block (P/N 88962516): Cast iron with 4-bolt main caps
Crankshaft (P/N 12489436): 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'c1 intake / 206'c1 exhaust
Cylinder heads (P/N 12558060): Vortec iron; 64cc chambers
Valve size (in): 1.94 intake / 1.50 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: 32'c1 total @ 4000 rpm with vacuum advance disconnected
Maximum rpm: 5000

Chevy HT 383 engine image

Part #:12499101

Chevy HT 383 dyno image

Installation Notes

  • NOTE: Distributor with melonized steel gear MUST be used with long blocks and partial engines with steel camshafts, or engine damage will occur. We recommend HEI distributor P/N 93448806.
  • Requires addition of carburetor, ignition and starter (not included).
  • Rochester Quadrajet or Holley 750-cfm carburetor recommended.
  • Comes with 12.75" automatic transmission flexplate. Requires externally balanced flywheel for manual transmission.
  • Has right-side oil dipstick.
  • Intended for pre-1977 street vehicles and all off-road vehicles.