Chevrolet - GMPP HT 383 PERFORMANCE TRUCK ENGINE
     The HT 383 truck crate engine produces 340 HP @ 4,500 RPM and 435 ft/lbs @ 4,000 RPM. This engine is equally at home as a street/strip performance engine as it is as a performance pickup engine. The HT 383 stroker engine is great economical way to bring life back to your favorite classic vehicle.
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Updated 05-03-2006.
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 HT 383 DESCRIPTION
HT 383 Picture
HT 383, Small Block Truck Power To Tow Or Go.
P/N 12499101
     Specially tuned for torque, the all new HT 383 delivers great truck power in a small block package. With its 3.80” stroke and Vortec cylinder heads the HT 383 makes awesome torque, down low where you need it for towing or four wheeling off road. Peak torque is 435 ft.lbs at 4000 rpm, but the HT 383 makes over 400 ft.lbs. from 2500 to 4000 rpm. Developed as a truck engine, with a truck grind roller cam, heavy duty forged powdered metal connecting rods, “4340”forged crankshaft and hypereutectic pistons the HT 383 is designed to be worked. 340 horsepower at 4500 rpm doesn’t hurt either. The HT 383 is an ideal replacement for any 1975 and older carbureted truck engine or off road application. [Old P/N 12497317]


Note: GM Crate Engines are horsepower rated to SAE standards.

 HT 383 TECHICAL INFORMATION
Horsepower: 340 @ 4500 RPM Torque: 435 @ 4000 RPM
Max. Rec. RPM: 5,000 Comp. Ratio: 9.1:1
Displacement: 383 ci Bore x Stroke: 4.00” x 3.80”
Block: 88962516 Four bolt main, cast iron Firing Order: 1-8-4-3-6-5-7-2
Con. Rods: 12497624 PM 5.7” forged Rocker Arms: 1.5 ratio stamped steel
Pistons: 12499103 High Silicon Aluminum .005 O/S Piston Rings: 12499107, .005 O/S
Camshaft: 14097395 Hydraulic Roller Tappet Lift: 0.431” I, 0.451” E
Duration: 196° I, 206° E @ .050” Lift Centerline: 108° ATDC I, 116° BTDC E
Valve Lash: Zero Timing Chain: 14088783, HD 8 mm single roller design.
Cylinder Heads: 12558060 Vortec, Cast Iron Volume: 62 cc
Intake Valves: 10241743, 1.94” dia. Exhaust Valves: 12550909, 1.50” dia.
Valve Springs: 10212811 Oil Pan: 5 quart with new filter.
Oil Pres. (norm): 40 psi @ 2,000 RPM Oil Filter: UPF1218 ACDelco Ultra Gold
Spark Plugs: R44LTS or Rapidfire #3 Fuel: Unleaded 87 Octane
Partial Engine: 12499106 Damper: 12498008
Head Gasket: 12557326 (.051 thick)    
Crankshaft: 12489436 4340 steel alloy (forged), one piece rear seal design, 3.8” stroke, 2.45 main journals/ 2.10” rod journals (standard 350 engine), main and rod journals are fully radiused, number 1 & 4 crank pins hollowed, cross drill oiling, rod and main oil chamfered, 3.00” flange bolt circle, nitride treated, and main bearing bolt torque.
Intake Manifold: 12496820 Aluminum dual plane with/dual carb pad and provision for EGR valve. It is designed to use a standard flange Holley carburetor.
Water Pump: 12529305 Long style cast iron with gasket. 180° F thermostat recommended.
Ignition Timing: 32° total @ 3000 RPM with vacuum advance disconnected.
Flexplate: 14088765 12-3/4” outside diameter, 153 tooth, 10.75” bolt pattern.
Technical Notes: 1 - GM recommends a Rochester Quadrajet or Holley 750 CFM carburetor for 383 applications.
2 - In 2004 GM redesigned the pistons and rings and they are .005" over sized now. This was done to better improve piston to cylinder wall clearance. The .005” O/S pistons and rings are the recommended standard size for all second design 383 ci engines. The first design ring and piston sets were: [Rings - 12522848 std. 4.00”, Pistons - 12489437 std. 4.00" (piston & pin set).]

 ADDITIONAL PARTS THAT WILL WORK WITH THE HT 383
Flywheel: Like all small-block V8 engines produced since 1986, the HT 383 crate engine has a 3.00” diameter flywheel flange bolt pattern. Small-block V8 engines produced from 1958 through 1985 had a 3.58” diameter flywheel flange bolt pattern. This change in bolt circle diameter was made to accommodate a leak-resistant one piece rear main seal.
Pilot Bearing: You must install a pilot bearing in the rear of the crankshaft if the engine will be used with a manual transmission. The pilot bearing aligns the transmission input shaft with the crankshaft centerline. A worn or misaligned pilot bearing can cause shifting problems and rapid clutch wear. A roller pilot bearing P/N 10461685 is recommended for this engine. This heavy duty bearing adds an extra margin of reliability to a high performance drivetrain.
Starter: The HT 383 does not include a starter. The starter must be matched to the flywheel or flexplate diameter when installing the HT 383 engine. Small diameter flywheels are 12-3/4” and have 153 teeth. Large diameter flywheels are 14” and have 168 teeth. This difference in flywheel diameter requires two different starter housings. Starter noses used with 14” diameter flywheels have two offset bolt holes; starters used with 12-3/4” flywheels have bolt holes that are straight across from each other.
Starters that can be used with the HT 383 are: P/N 10496870, 1876552, 14097278, 14097279, 10455709, 9000852, 14037733, and 12338064.
Note - Chevrolet starter motors use special shoulder mounting bolts which register the starter on the block.
Carburetor/Air Cleaner: A 750 cfm four-barrel carburetor with either mechanical or vacuum operated secondaries and electric choke is recommended for the HT 383 engine.
A foam or paper element, low restriction air cleaner should be used. The fuel mixture distribution can be upset if no diffuser is used, causing poor power and misfiring at high engine speeds. Always check for adequate hood clearance when installing a new air cleaner. GMPP has two chromed, 14” diameter, open element air assemblies for single four-barrel carburetors. P/N 12342079 has a plain top, and P/N 12342071 has a Chevrolet logo. Both of these are supplied with a 3” tall filter element P/N 6421746 (AC P/N A212cw). A taller 4” element is available as P/N 8997189 (AC P/N A698c).
Fuel Pump: The HT 383 crate engine does not include a fuel pump. The fuel system must be capable of supplying adequate fuel volume at a minimum of 6 psi pressure when the engine is operating at wide open throttle (WOT). A high volume in-line electric fuel pump is available from GMPP P/N 25115899. This heavy duty pump flows 72 gallons per hour at 6-8 psi outlet pressure.
Spark Plugs/Spark Plug Wires: The Ht 383 crate engine comes with spark plugs P/N 5613611 (AC P/N R44LTS). If you are installing the engine in a vehicle originally equipped with a small-block V8 with HEI ignition, standard replacement spark plug wires can be used. High performance 8 mm diameter wire sets with Chevrolet Bow Tie logo or GMPP logo are available from GMPP for custom installations. The GMPP logo wire sets are available as P/N 12361056 (135° spark plug boots) and P/N 12361057 (90° spark plug boots). The Chevrolet logo wire sets are P/N 12361050 (135° spark plug boots) and 12361051 (90°spark plug boots). The 135° spark plug boot set is recommended for routing the spark plug wires over the valve covers. The 90° spark plug boot set is recommended for routing the spark plug wires under exhaust headers. For extended highway use, you may want to upgrade spark plugs to 41-942 Dual Platinum P/N 25164048.
Rocker Covers: The HT 383 comes equipped with black stamped steel, center hold-down rocker covers. A black composite center hold-down bolt LT4 type rocker cover is available (P/N 12552321 LH and P/N 12552322 RH). Also chrome center hold-down bolt rocker covers with a red chevrolet Bow Tie logo are available (P/N 12355350 LH and RH). If you want the appearance of an early-model engine, pre-1987 flange mount rocker covers can be installed using adapter P/N 24502540. This adapter is machined from billet aluminum, and uses an O-ring seal between the adapter and cylinder head rocker cover rail.