The 350/290 HP engine incorporates modern technology in a package that can be installed in most applications where 265-400ci small block Chevrolet V-8’s were originally used. This complete engine is assembled using brand new, premium quality components. Due to the wide variety of vehicles in which a 350/290 HP engine can be installed, some procedures and recommendations may not apply to specific applications.

The 350/290 HP engine is internally balanced and requires no balance weights on either the flywheel/flexplate or the harmonic balancer. A non-Vortec design intake manifold must also be used. When using the 350/290 HP engine as a replacement for an original equipment engine, the performance intent of this engine should be considered. The torque curve is higher and consequently may require a torque converter with a higher stall speed on automatic transmission equipped vehicles. Consult with a reputable torque converter manufacturer for assistance in selecting the correct torque converter for your application.

The 350/290 HP engine is manufactured on current production tooling; consequently you may encounter dissimilarities between the 350/290 HP engine assembly and previous versions of the small block V-8. In general, items such as motor mounts, accessory drives, exhaust manifolds, etc. can be transferred to a 350/290 HP when it is installed in a vehicle originally equipped with a small block V-8 engine. However, as noted in the following sections, there may be minor differences between a 350/290 HP engine and an older small block V-8 engine. These differences may require modifications or additional components not included with the 350/290 HP engine. When installing a 350/290 HP engine in a vehicle not originally equipped with a small block V-8, it may be necessary to adapt or fabricate various components for the cooling, fuel, electrical, and exhaust systems.

Cylinder Heads

The 350/290 HP engine has cast iron cylinder heads. The heads have 1.94" intake valves and 1.50" exhaust valves with pressed-in 3/8" studs and 76 cc combustion chambers. The water passages are the same as the original 1955 small block Chevy design. These cylinder heads have a twelve (12) bolt intake manifold mounting pattern, six (6) bolts per cylinder head.

Oil Pan / Filter / Adapter / Dipstick

The 350/290 HP engine block has provisions for both right-hand and left-hand dipsticks. The 350/290 HP engine includes a 4-quart oil pan Part number 10066039 which has the "double bump out" for both dipstick designs. The oil dipstick for the 350/290 HP engine for the right-hand (passenger) side of the block is 10190942 (indicator) and 12552920 (tube). If not using right-hand dipstick, use plug 09421743. The oil dipstick for the 350/290 HP engine for the left-hand (driver) side of the block is 03951576 (indicator), and 03876870 (upper tube). P/N 03951600 (lower tube) is installed at the factory. If not using left-hand dipstick, use plug 93415510 to prevent an oil leak. The 350/290 HP engine assembly includes an oil filter adapter but no oil filter element. The 350/290 HP uses an AC # PF 454 or PF1218 oil filter.

Camshaft

The 350/290 HP engine uses an aggressive flat tappet camshaft to achieve the level of performance for its intended usage. Camshaft lift is .450" intake / .460" exhaust. Camshaft duration (@.050") is 222 degrees intake and exhaust. Lobe centerline is 114 degrees. Normal engine manifold vacuum for the 350/290 HP engine is 10-12" Hg at idle (650-750 rpm).

The 350HO Deluxe Engine incorporates modern technology in a package that can be installed in applications where 265-400ci small block Chevrolet V-8’s were originally used. This complete engine is assembled using brand new, premium quality components. Due to the wide variety of vehicles in which a 350HO Deluxe Engine can be installed, some procedures and recommendations may not apply to specific applications.

The 350HO Deluxe Engine is manufactured on current production tooling; consequently you may encounter dissimilarities between the 350HO Deluxe Engine assembly and previous versions of the small block V-8. In general, items such as motor mounts, accessory drives, exhaust manifolds, etc. can be transferred to a 350HO Deluxe when it is installed in a vehicle originally equipped with a small block V-8 engine. However, as noted in the following sections, there may be minor differences between a 350HO Deluxe Engine and an older small block V-8 engine. These differences may require modifications or additional components not included with the 350HO Deluxe Engine. When installing a 350HO Deluxe Engine in a vehicle not originally equipped with a small block V-8, it may be necessary to adapt or fabricate various components for the cooling, fuel, electrical, and exhaust systems.

Cylinder Heads

The 350 HO Deluxe Engine has Vortec Cast Iron Cylinder Heads. These cylinder heads were first used on 1996 trucks with port fuel injection, RPO L31. The intake and exhaust ports are very similar to the Corvette 350 LT1 heads. The heads have 1.94" intake valves and 1.50" exhaust valves with pressed-in 3/8" studs. The water passages are the same as the original 1955 small block Chevy design. These cylinder heads have an eight (8) bolt intake manifold mounting pattern, four (4) bolts per cylinder head.

Intake Manifold

This kit comes with a GM Performance Parts dual plane intake manifold GM Part Number 12486571 designed for use with Vortec cylinder heads. This intake manifold was designed to use a standard flange Holley carburetor. This intake manifold does not have provisions for an exhaust gas recirculation (EGR) valve or a hot air choke.

Water Pump

The 350 HO Deluxe engine comes with a long style cast iron water pump, GM Part Number 12529305. The cooling system has a 180° F thermostat installed.

Ignition System

Oil Pan / Filter / Adapter / Dipstick

Carburetor / Air Cleaner

Spark Plugs / Spark Plug Wires

The 350 HO Deluxe engine’s cast iron cylinder heads have straight spark plugs. Check for spark plug and wire clearance when using exhaust manifolds or aftermarket headers designed for straight plugs. Sparkplug wires, GM Part Number 12361057 are installed on the 350 HO Deluxe engine. These wires have 90° sparkplug boots, and the GM Performance Parts logo.

The 350HO engine incorporates modern technology in a package that can be installed in applications where 265-400ci small block Chevrolet V-8’s were originally used. This complete engine is assembled using brand new, premium quality components. Due to the wide variety of vehicles in which a 350HO engine can be installed, some procedures and recommendations may not apply to specific applications.

The 350HO engine is manufactured on current production tooling; consequently you may encounter dissimilarities between the 350HO engine assembly and previous versions of the small block V-8. In general, items such as motor mounts, accessory drives, exhaust manifolds, etc. can be transferred to a 350HO when it is installed in a vehicle originally equipped with a small block V-8 engine. However, as noted in the following sections, there may be minor differences between a 350HO engine and an older small block V-8 engine. These differences may require modifications or additional components not included with the 350HO engine. When installing a 350HO engine in a vehicle not originally equipped with a small block V-8, it may be necessary to adapt or fabricate various components for the cooling, fuel, electrical, and exhaust systems.

Cylinder Heads

The 350 HO engine has Vortec Cast Iron Cylinder Heads. These cylinder heads were first used on 1996 trucks with port fuel injection, RPO L31. The intake and exhaust ports are very similar to the Corvette 350 LT1 heads. The heads have 1.94" intake valves and 1.50" exhaust valves with pressed-in 3/8" studs. The water passages are the same as the original 1955 small block Chevy design. These cylinder heads have an eight (8) bolt intake manifold mounting pattern, four (4) bolts per cylinder head.

Oil Pan / Filter / Adapter / Dipstick

The ZZ4 engine incorporates modern technology in a package that can be installed in applications where 265- 400ci small block Chevrolet V-8’s were originally used. This complete engine is assembled using brand new, premium quality components. Due to the wide variety of vehicles in which a ZZ4 engine can be installed, some procedures and recommendations may not apply to specific applications.

The ZZ4 engine is manufactured on current production tooling; consequently you may encounter dissimilarities between the ZZ4 engine assembly and previous versions of the small block V-8. In general, items such as motor mounts, accessory drives, exhaust manifolds, etc. can be transferred to a ZZ4 when it is installed in a vehicle originally equipped with a small block V-8 engine. However, as noted in the following sections, there may be minor differences between a ZZ4 engine and an older small block V-8 engine. These differences may require modifications or additional components not included with the ZZ4 engine. When installing a ZZ4 engine in a vehicle not originally equipped with a small block V-8, it may be necessary to adapt or fabricate various components for the cooling, fuel, electrical, and exhaust systems.

Intake Manifold

This ZZ4 engine comes with a GM Performance Parts dual plane intake manifold part number 10185063 designed for use on all small blocks through 1986. This intake manifold was designed with a dual pattern carb flange. This intake manifold does have provisions for late model accessory brackets, an exhaust gas recirculation (EGR) valve and an integral hot air choke.

Water Pump

The ZZ4 engine comes with a long style cast iron water pump Part number 88894341, the water pump includes gaskets. The cooling system has a 180° F thermostat.

Ignition System

The FB385 engine incorporates modern technology in a package that can be installed in applications where 265-400ci small block Chevrolet V-8’s were originally used. This complete engine is assembled using brand new, premium quality components. Due to the wide variety of vehicles in which a FB385 engine can be installed, some procedures and recommendations may not apply to specific applications.

The FB385 engine is manufactured on current production tooling; consequently you may encounter dissimilarities between the FB385 engine assembly and previous versions of the small block V-8. In general, items such as motor mounts, accessory drives, exhaust manifolds, etc. can be transferred to a FB385 when it is installed in a vehicle originally equipped with a small block V-8 engine. However, as noted in the following sections, there may be minor differences between a FB385 engine and an older small block V-8 engine. These differences may require modifications or additional components not included with the FB385 engine. When installing a FB385 engine in a vehicle not originally equipped with a small block V-8, it may be necessary to adapt or fabricate various components for the cooling, fuel, electrical, and exhaust systems.

Cylinder Heads

The FB385 engine has "Fast Burn" CNC- machined aluminum performance cylinder heads. These cylinder heads have a 23-degree valve angle, no heat riser ports, 62cc combustion chambers, and utilize angle spark plugs. The intake ports are 210cc and the roof is raised .240". The D-shaped exhaust ports are 78cc and raised .200". These heads have 2.00" intake valves and 1.55" exhaust valves with screw-in 3/8" studs. The water passages are the same as the original 1955 small block Chevy design. These cylinder heads have dual pattern intake manifold mounting for both Vortec and early model manifolds. They also have dual pattern valve cover mounting for both center bolt and perimeter bolt pattern valve covers.

Intake Manifold

This FB385 engine comes with a GM Performance Parts dual plane intake manifold part number 12366573 designed for use with raised intake ports and 1996 and newer Vortec style intake bolt pattern. This intake manifold was designed to use a standard flange Holley carburetor. This intake manifold does not have provisions for an exhaust gas recirculation (EGR) valve or a hot air choke.

Water Pump

The FB385 engine comes with a long style cast iron water pump Part number 88894341, the water pump includes gaskets. The cooling system has a 180° F thermostat.

Ignition System

The HT383E engine incorporates modern technology in a package that can be installed in applications where 265-400ci small block Chevrolet V-8’s were originally used. This complete engine is assembled using brand new, premium quality components. Due to the wide variety of vehicles in which an HT383E engine can be installed, some procedures and recommendations may not apply to specific applications.

The HT383E engine consists of a cast iron engine block, cast iron cylinder head assemblies, forged steel crankshaft, hypereutectic pistons, forged powder metal connecting rods, and a performance camshaft.

The HT383E engine is manufactured on current production tooling; consequently you may encounter dissimilarities between the HT383E engine assembly and previous versions of the small block V-8. In general, items such as motor mounts, accessory drives, exhaust manifolds, etc. can be transferred to an HT383E when it is installed in a vehicle originally equipped with a small block V-8 engine. However, as noted in the following sections, there may be minor differences between an HT383E engine and an older small block V-8 engine. These differences may require modifications or additional components not included with the HT383E engine. When installing an HT383E engine in a vehicle not originally equipped with a small block V-8, it may be necessary to adapt or fabricate various components for the cooling, fuel, electrical, and exhaust systems.

Block

The HT383E Block is a 1986 and later (1 piece rear main seal) design. The block is bored then deck plate honed to a finished size of 4.005". Features include 4 bolt intermediate mains, clearanced for a 3.80" stroker crankshaft, and machined for hydraulic roller or flat tappet lifters.

Crankshaft

The HT383E Engine comes with forged crankshaft part number 12489436. The crankshaft features are outlined below:

Connecting Rods

Steel powdered metal connecting rod with the centerline of crank pin bore to centerline of piston pin bore is 5.700". It has been machined to clear camshafts in most small block stroker applications.

Engine Bearings

Pistons

New high performance hypereutectic flat top pistons featuring a special skirt coating designed to run with a piston to cylinder wall clearance of .0010"-.0015" including the coating. These pistons were designed to take full advantage of the deck plated and precisely honed engine block. They also feature a pressed piston pin.

Water Pump

The HT383E engine comes with a long leg style cast iron water pump.

Crankshaft Position Sensor (CKP)

The HT383E includes a crankshaft position sensor and the crankshaft target wheel behind the front cover. The crankshaft position sensor (CKP) mounting position is located in the front engine cover and is perpendicular to the crankshaft target wheel. The air gap between the sensor and the wheel is preset and not adjustable. The target wheel has 4 slots 60 degrees apart and is keyed to the crankshaft. As the target wheel rotates, the slots passing by the sensor create a change in the magnetic field of the sensor which results in an induced voltage pulse. One revolution of the crankshaft results in four pulses (4x signal). Based on these pulses, the VCM is able to determine crankshaft position and engine speed. The VCM then activates the fuel injector and provides a spark to the distributor.

The HT383 engine incorporates modern technology in a package that can be installed in applications where 265- 400ci small block Chevrolet V-8’s were originally used. This complete engine is assembled using brand new, premium quality components. Due to the wide variety of vehicles in which an HT383 engine can be installed, some procedures and recommendations may not apply to specific applications.

The HT383 engine consists of a cast iron engine block, cast iron cylinder head assemblies, forged steel crankshaft, hypereutectic pistons, forged powder metal connecting rods, and a performance roller camshaft.

The HT383 engine is manufactured on current production tooling; consequently you may encounter dissimilarities between the HT383 engine assembly and previous versions of the small block V-8. In general, items such as motor mounts, accessory drives, exhaust manifolds, etc. can be transferred to an HT383 when it is installed in a vehicle originally equipped with a small block V-8 engine. However, as noted in the following sections, there may be minor differences between an HT383 engine and an older small block V-8 engine. These differences may require modifications or additional components not included with the HT383 engine. When installing an HT383 engine in a vehicle not originally equipped with a small block V-8, it may be necessary to adapt or fabricate various components for the cooling, fuel, electrical, and exhaust systems.

Block

The HT383 Block is a 1986 and later (1 piece rear main seal) design. The block is bored then deck plate honed to a finished size of 4.005". Features include 4 bolt intermediate mains, clearanced for a 3.80" stroker crankshaft, and machined for hydraulic roller or flat tappet lifters.

Crankshaft

The HT383E Engine comes with forged crankshaft part number 12489436. The crankshaft features are outlined below:

Connecting Rods

Steel powdered metal connecting rod with the centerline of crank pin bore to centerline of piston pin bore is 5.700". It has been machined to clear camshafts in most small block stroker applications.

Engine Bearings

Pistons

New high performance hypereutectic flat top pistons featuring a special skirt coating designed to run with a piston to cylinder wall clearance of .0010"-.0015" including the coating. These pistons were designed to take full advantage of the deck plated and precisely honed engine block. They also feature a pressed piston pin.

Water Pump

The HT383 engine comes with a long leg style cast iron water pump.

For those who want to build their own custom stroker small block engine, this partial comes with the specially modified block, 3.80" forged steel stroker crankshaft, heavy duty connecting rods, hypereutectic pistons, bearings, oil pan, oil pump, front cover, damper, and 12.75" flexplate. This partial engine does not include a camshaft, lifters, timing chain, or cam sprocket. The oil pan is installed loosely on the block so it can be disassembled without destroying the pan gasket. Just add all the parts to complete this engine from GMPP such as cylinder heads, camshaft and valvetrain, intake, carburetor and ignition system.

Important Note: When using this partial engine for service on HT383E, The front cover must be replaced using P/ N 93800970, the damper must be changed to P/N 17191019, and crankshaft reluctor P/N 10190917 must be added. The HT383E does not have provisions for ignition timing adjustments since it uses crankshaft position for spark reference.

The 383 engine is manufactured on current production tooling; consequently you may encounter dissimilarities between the 383 engine assembly and previous versions of the small block V8. In general, items such as motor mounts, accessory drives, exhaust manifolds, etc. can be transferred to a 383 engine when installed in a vehicle originally equipped with a small block V8 engine. However, as noted in the following sections, there may be significant differences in the water pump, torsional damper, etc., between a 383 engine and an older small block V8 engine. These differences may require modifications or additional components not included with the 383 engine. When installing the 383 engine in a vehicle not originally equipped with a small block V8, it may be necessary to adapt or fabricate various components for the cooling, fuel, electrical, and exhaust systems. Due to the wide variety of vehicles in which a 383 engine can be installed, some procedures and recommendations may not apply to specific applications.

The ZZ383 engine incorporates modern technology in a package that can be installed in applications where 265-400ci small block Chevrolet V-8’s were originally used. This complete engine is assembled using brand new, premium quality components. Due to the wide variety of vehicles in which a ZZ383 engine can be installed, some procedures and recommendations may not apply to specific applications.

The ZZ383 engine consists of a cast iron engine block, cast aluminum "Fast Burn" cylinder head assemblies, forged steel crankshaft, hypereutectic pistons, powder metal connecting rods, performance camshaft, and hydraulic roller lifters.

The ZZ383 engine is manufactured on current production tooling; consequently you may encounter dissimilarities between the ZZ383 engine assembly and previous versions of the small block V-8. In general, items such as motor mounts, accessory drives, exhaust manifolds, etc. can be transferred to a ZZ383 when it is installed in a vehicle originally equipped with a small block V-8 engine. However, as noted in the following sections, there may be minor differences between a ZZ383 engine and an older small block V-8 engine. These differences may require modifications or additional components not included with the ZZ383 engine. When installing a ZZ383 engine in a vehicle not originally equipped with a small block V-8, it may be necessary to adapt or fabricate various components for the cooling, fuel, electrical, and exhaust systems.

Block

The ZZ383 Block is a 1986 and later (1 piece rear main seal) design. The block is bored and block deck plate honed to a finished size of 4.005". Features include 4 bolt intermediate mains, clearanced for a 3.80" stroker crankshaft, and machined for hydraulic roller or flat tappet lifters.

Crankshaft

The ZZ383 Engine comes with forged crankshaft part number 12489436. The crankshaft features are outlined below:

Connecting Rods

Steel powdered metal connecting rod with the centerline of crank pin bore to centerline of piston pin bore is 5.700". It has been machined to clear camshafts in most small block stroker applications.

Engine Bearings

Pistons

New high performance hypereutectic flat top pistons featuring a special skirt coating designed to run with a piston to cylinder wall clearance of .0010"-.0015" including the coating. These pistons were designed to take full advantage of the deck plated and precisely honed engine block. They also feature a pressed piston pin.

Cylinder Heads

Aluminum "Fast Burn" cylinder heads, part number 12464298, have the highest performance potential of any 23° small block cylinder head developed by GM. The name "Fast Burn" refers to the cylinder head’s ability to quickly and completely burn the air fuel mixture, resulting in higher cylinder pressures and more power. The shape of the combustion chamber is designed to accomplish this "Fast Burn" with flat top pistons. Like those supplied with the engine package. The "Fast Burn" head accepts both center bolt and early style four bolt flange mount rocker covers. Intake manifold mating surfaces are drilled and tapped for both Vortec and conventional raised port style intake manifolds. Vortec style manifolds are recommended.