1983 Chevrolet Monte Carlo

5.0L (305") V8 - VINS [H & S] 1983 GENERAL MOTORS ENGINES 5.0L (305") V8 - VINS H & S

5.0L (305") V8 - VINS [H & S]

1983 GENERAL MOTORS ENGINES 5.0L (305") V8 - VINS H & S

ENGINE IDENTIFICATION

NOTE: For engine repair procedures not covered in this article, see ENGINE
OVERHAUL PROCEDURES - GENERAL INFORMATION article in the GENERAL
INFORMATION section.

Engine may be identified from the Vehicle Identification Number (VIN) stamped on a metal tab located on top
of instrument panel at lower left of windshield. The VIN number contains 17 digits. The 8th digit identifies the
engine and the 10th digit establishes the model year.

ENGINE IDENTIFICATION CODES

Application Engine Code VIN Code
4-Bbl. LG4 H
CFI (1) LU5 S
(1) CFI is Crossfire Injection, a type of TBI.

ADJUSTMENTS

REMOVAL & INSTALLATION

ENGINE

See ENGINE REMOVAL article in this section.

INTAKE MANIFOLD

Removal (Carbureted Models)

1. Disconnect negative battery cable. Drain cooling system. Remove air cleaner. Remove AIR crossover
hoses. Remove heater and radiator hoses. Remove alternator upper bracket. Disconnect carburetor
linkage, fuel line, vacuum lines and electrical wiring at manifold.
2. Disconnect right side spark plug wires at spark plugs. Remove distributor cap and position cap and wires
aside. Mark position of rotor with chalk and remove distributor. If equipped, remove A/C and cruise
control servo brackets.
3. Remove brake vacuum pipe. If equipped, remove EGR valve. Remove carburetor. Remove manifold
bolts and remove intake manifold.

Removal (CFI Models)

1. Disconnect negative battery cable. Drain radiator, remove air cleaner, EGR solenoid, and fuel inlet line.

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5.0L (305") V8 - VINS [H & S] 1983 GENERAL MOTORS ENGINES 5.0L (305") V8 - VINS H & S

Disconnect idle air motors, injectors and Throttle Position Sensor (TPS). Remove alternator adjustment
bracket. Remove power brake booster line and fuel return line.
2. If equipped with A/C, remove A/C strut. Disconnect accelerator cable and cruise control, if equipped.
Disconnect PCV hose, vacuum hoses, fuel balance tube, CFI-to-manifold bolts and CFI plate. Remove
cap and distributor. Remove radiator hose at thermostat housing. Disconnect heater hose and remove
manifold.

Installation (All Models)

1. Clean mating surfaces of head and manifold. Install manifold side gaskets on cylinder heads. Using RTV
sealer, lay a bead along front and rear ridge of block, about 1/2" up each head to seal and retain manifold
side gaskets.

Fig. 1: Intake Manifold Tightening Sequence

2. Use sealer at water passages and install manifold and bolts. Tighten bolts in sequence. See Fig. 1 .
Reverse removal procedure to complete installation.

EXHAUST MANIFOLD

Removal (Left Side)

Disconnect negative battery cable. Raise vehicle on hoist. Disconnect exhaust pipe at manifold and suspend
with wire. Lower vehicle. If equipped, remove A/C compressor and bracket and position aside, leaving
refrigerant lines attached. Remove power steering bracket. Remove end bolts, center bolts and remove exhaust
manifold.

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5.0L (305") V8 - VINS [H & S] 1983 GENERAL MOTORS ENGINES 5.0L (305") V8 - VINS H & S

Removal (Right Side)

1. Disconnect negative battery cable. Remove air cleaner and heat stove pipe. Raise vehicle on hoist.
Disconnect exhaust pipe at manifold and suspend exhaust pipe with wire.
2. Lower vehicle. Disconnect spark plug wires, EFE valve vacuum hose and any emission control devices
that interfere with manifold removal. Remove end bolts, center bolts and remove exhaust manifold.

Installation

Clean exhaust manifold and cylinder head mating surfaces of any carbon and/or dirt. Position manifold to
cylinder head and install bolts finger tight. With manifold correctly positioned on cylinder head, tighten bolts to
specification. Reverse removal procedure to complete installation.

OVERHAUL
CYLINDER HEAD

Removal

1. Remove intake manifold as previously described. Remove alternator lower mounting bolt and position
alternator aside. Remove exhaust manifold as previously described.
2. Remove rocker arm cover and remove rocker arm assembly. Drain cylinder block of coolant. If
necessary, remove diverter valve. Remove head bolts, cylinder heads and gaskets. Place each cylinder
head on 2 wood blocks to prevent damage.

Fig. 2: Cylinder Head Tightening Sequence Apply sealer to head bolt threads and tighten in sequence.

Installation

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5.0L (305") V8 - VINS [H & S] 1983 GENERAL MOTORS ENGINES 5.0L (305") V8 - VINS H & S

1. Clean cylinder block and cylinder head mating surfaces of any gasket material, carbon and/or dirt. Make
sure mating surfaces are free of any nicks or heavy scratches. Clean bolt hole threads in cylinder block to
ensure proper bolt torque.
2. Where steel gaskets are used, apply a thin, even coat of sealer to both sides of gasket. On composition
steel asbestos gaskets, do not use sealer of any type. Install gaskets over dowel pins with "bead" side up.
3. Install cylinder heads, applying sealing compound to head bolt threads and tighten in sequence. See Fig.
2 . Reverse removal procedure to complete installation.

VALVE ARRANGEMENT

E-I-I-E-E-I-I-E (Both banks, front to rear).

VALVE GUIDE SERVICING

Insert valve with valve head positioned 1/16" above valve seat. Attach dial indicator to cylinder head. Position
dial indicator stem against valve stem just above valve guide. Rock valve in guide and measure guide wear as
shown on indicator.

If valve guide wear is excessive, ream valve guide to next size oversize. Service valves are available in
standard, .003", .015" and .030" (.076, .381 and .762 mm) oversize.

VALVE STEM OIL SEALS SERVICE

Oil seals are installed on all valve stems and must be replaced whenever valve service is performed. See Valve
Spring Removal for disassembly. Lightly coat seals with engine oil to prevent twisting. Reverse the disassembly
procedures to complete installation. Using valve oil seal leak detector (J-23994 or equivalent), apply vacuum to
make sure no air leaks past seal.

VALVE SPRINGS

Removal (Cylinder Head Installed)

1. Remove rocker arm cover, spark plug, rocker arm and push rods on cylinder(s) to be serviced. Install air
line adapter (J-23590 ) to spark plug port and apply compressed air to hold valves in place.
2. Using valve spring compressor (J-5892 ), compress valve spring and remove valve locking keys, valve
cap, valve spring and damper. Remove valve stem or head oil seal.

Inspection

Check valve spring tension using valve and clutch spring tension tester (J-8056 or equivalent). Springs must be
within 10 lbs. of specified load at required height (without dampers).

Installation (Cylinder Head Installed)

1. Install valve stem oil seal over valve stem and seat against cylinder head. Set valve spring and damper, oil
shedder and valve cap (or rotator) in place. Compress spring with compressor tool (J-5892 ) and install oil
seal in the lower groove of the stem.

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2. Ensure seal is flat and not twisted. A light coat of oil will help prevent twisting. Install locking keys and
release compressor tool. Use grease to hold keys in place while releasing tool. Using vacuum tool (J-
23994 ), apply vacuum to valve cap and be sure no air leaks past seal. To complete installation, reverse
removal procedure.

Removal (Cylinder Head Removed)

1. With rocker arm removed, compress valve springs using compressor tool (J-8062 ). Remove locking keys
and release compression tool.
2. Remove caps (or rotators), oil shedders, springs and spring dampers, oil seals and valve spring shims.
Keep components in original order for reinstallation in proper location.

Inspection

Check valve spring tension using valve and clutch spring tension tester (J-8056 or equivalent). Springs must be
within 10 lbs. of specified load at required height (without dampers).

Installation (Cylinder Head Removed)

Install valve spring shims, if used. Install springs, dampers, oil shedder and valve cap (or rotator). Compress
spring with compressor (J-8062 ) and install oil seal in lower groove of valve stem. Ensure that seal is flat and
not twisted. Install valve locks and release spring compression tool.

VALVE SPRING INSTALLED HEIGHT

Installed height of valve spring should be 1.72" (43.7 mm). Measure from top of spring seat (in head) to top of
oil shield. If measurement exceeds specifications, install a 1/16" shim at spring seat. Valve spring should never
be shimmed to give an installed height of less than minimum specification.

VALVE ADJUSTMENT

1. To adjust valves, rotate crankshaft to No. 1 firing position and adjust following valves:
l Intake No. 1, 2, 5 and 7.

l Exhaust No. 1, 3, 4 and 8.

2. Adjust valves by backing off adjusting nut until lash is felt at push rod, then tighten until all lash is
removed. Tighten adjusting nut an additional 1 full turn. Rotate crankshaft to No. 6 firing position. Adjust
the following valves:
l Intake No. 3, 4, 6 and 8.

l Exhaust No. 2, 5, 6 and 7.

3. When adjustment is complete, install rocker arm covers. Start engine and check timing and idle speed.

ROCKER ARM STUDS

Cylinder heads use pressed in rocker arm studs. Rocker arm studs having damaged threads or loose fit in
cylinder head should be replaced. Studs are available in standard, .003" (.076 mm) and .013" (.330 mm)
oversize.

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Removal

Remove stud using puller tool (J-5802-1 or equivalent). Install removal tool over stud, install flat washer and
nut and tighten nut until stud is removed.

Installation

1. If necessary, ream stud hole for oversize stud using reamer tool (J-5715 for .003" (.076 mm) oversize, and
J-6036 for .013" (.330 mm) oversize). Do not install an oversize stud without first reaming stud hole, as
damage to head casting may occur.
2. Coat press fit area of stud with hypoid axle lubricant. Drive stud into place using guide tool (J-6880 or
equivalent) and a hammer. When guide tool bottoms on head, stud is at correct height.

HYDRAULIC VALVE LIFTER ASSEMBLY

Lifters are serviced as a complete unit only. If lifter is damaged or worn, it must be replaced. Should lifter be
disassembled for any reason, test lifter leakdown rate. When new lifters are installed, an additive containing EP
lubricant should be added to crankcase oil during break-in period. See Fig. 3 . Make sure lifter foot is convex
for proper lifter rotation.

Fig. 3: Exploded View of Hydraulic Lifter Assembly

OIL PAN

See OIL PAN REMOVAL article in this section.

PISTON & ROD ASSEMBLY

Removal

1. With oil pan, oil pump and cylinder heads removed, use a ridge reamer to remove any ridge or deposit
from upper portion of cylinder bore. Be sure piston and rod assembly is marked for reinstallation in

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original location.
2. With piston at bottom of stroke, remove connecting rod cap and install rod bolt guides over rod bolts.
Push piston and rod assembly out top of bore and reinstall rod cap to respective rod. Rotate crankshaft as
required to remove remaining piston and rod assemblies.

Installation

1. Apply a light coating of oil to pistons, rings, cylinder bores and bearings. Install bearings on connecting
rods. Use compression tool (J-8037 ) to compress rings. Ensure that ring gaps are staggered around piston
and are not aligned.
2. Install piston and rod assembly with bearing tang slot on opposite side of camshaft. Remove rod bolt
guides, install bearings and caps and tighten.

FITTING PISTONS

NOTE: New pistons must be installed into cylinders for which they were fitted. Old
pistons should be returned to cylinders from which they were removed.

1. Measure cylinder bore diameter with an inside micrometer or dial bore gauge 2 1/2" (63.50 mm) from top
of cylinder. Center dial bore gauge in cylinder and set indicator to zero. Move gauge carefully up and
down cylinder and turn in different directions to determine cylinder out-of-round and taper.
2. Out of round must not exceed .002" (.051 mm) and taper .005" (.128 mm). Cylinder may be honed
and .001" (.025 mm) oversize pistons installed if measurements do not exceed specifications. Measure
piston on skirt at right angles to piston pin at centerline of pin. Oversize pistons are available if cylinders
are bored.

FITTING RINGS

1. Position ring in cylinder bore. Push ring down into cylinder bore approximately 1/4" above ring travel,
making sure ring is positioned squarely in cylinder bore.
2. Measure gap between ends of ring using feeler gauge. If gap is not within specification, substitute another
ring set until fit is correct.

PISTON PINS

Using arbor press and piston pin remover (J-24086-8 ), remove pin. With piston and rod separated, inspect pin
and pin bore for wear and measure clearance. If clearance exceeds .001" (.025 mm), replace piston and pin
assembly.

NOTE: During production, .009" (.229 mm) undersize bearings may have been installed
for close tolerances on some journals.

CONNECTING ROD BEARING SERVICE

1. Remove rod cap and use Plastigage method to check bearing clearance. Place Plastigage across full width
of bearing journal, parallel to crankshaft. Install rod cap and tighten nuts.

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2. Remove rod cap and determine amount of clearance by measuring width of compressed Plastigage at
widest point. Bearings must be replaced if clearance is inaccurate. Precision bearings have been used and
shimming is not necessary for adjustment. Never file or grind connecting rods or caps when fitting
bearings.
3. New bearings are available in standard, .001" (.025 mm) and .002" (.051 mm) undersize for use with
standard size crankshaft and in .009", .010" and .020" (.229, .254 and .508 mm) undersize for use with
reconditioned crankshaft.
4. Use a micrometer to check for out-of-round condition on crankshaft journals. If journals are more
than .001" (.025 mm) out-of-round or tapered, crankshaft must be replaced or reconditioned.
5. When all bearings are checked and/or replaced and checked once more, tap each rod lightly (parallel to
crankpin). Be sure side play clearance is within specification. If clearance cannot be corrected with
service bearings, grind crankpin to next undersize. If already ground to maximum undersize, replace
crankshaft.

MAIN BEARING SERVICE

1. If bearings are being checked with engine in vehicle, crankshaft must be supported to take up clearance
between upper bearing half and crankshaft. Support crankshaft at both damper and flywheel. Be sure all
bearing caps, other than the one being checked, are tightened to specification.
2. Start with rear main bearing and work forward. Remove main cap and use Plastigage method to check
bearing clearance. Place Plastigage across full width of bearing journal, parallel to crankshaft. Install
main cap and tighten bolts to specification.
3. Remove main cap and determine amount of clearance by measuring width of compressed Plastigage at
widest point. Bearings must be replaced if clearance is not within specifications. Always install bearings
in pairs. Never combine old and new bearing halves.
4. New bearings are available in standard, .001" and .002" (.025 and .051 mm) undersize for use with
standard size crankshaft and in .009", .010" and .020" (.229, .254 and .508 mm) undersize for use with
reconditioned crankshaft.
5. If main bearing cap requires replacement, laminated shims are available. Shim requirement is determined
by bearing clearance. Replace upper and lower inserts as a unit. Use a micrometer to check for out-of-
round condition on crankshaft journals.
6. If journals are more than .001" (.025 mm) out-of-round or tapered, crankshaft must be replaced or
reconditioned. If within specifications, coat bearings with oil and install main caps. When all bearings are
checked and/or replaced and checked once more, check thrust bearing alignment.

THRUST BEARING ALIGNMENT

1. Make sure all main bearing caps are installed with arrows pointing toward front of engine. Tighten main
bearing cap bolts (except rear main) to specification. Tighten rear main bolts to 11 ft. lbs. (15 N.m) and
tap end of crankshaft rearward and then forward to line up main bearing thrust surfaces with crankshaft
thrust face.
2. Tighten all main bearing cap bolts to specification. Rotate crankshaft to ensure there is no excessive drag.
Measure end play at front end of rear main bearing using feeler gauge.

REAR MAIN BEARING OIL SEAL

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NOTE: Always replace upper and lower seals as a unit. Lip of seals should face front of
engine.

Removal (Crankshaft Installed)

1. Remove oil pan and oil pump. Remove rear main bearing cap and take out old seal with a small
screwdriver.

Fig. 4: Rear Main Bearing Oil Seal Installation Tool Position installer between crankshaft and seal
seat in cylinder block.

2. Remove upper seal with a brass pin punch. Tap punch until seal protrudes enough to grip with pliers.
Clean foreign material from bearing cap and block.
3. Check components for scratches, nicks and defects. Before installation, make a seal installation tool using
a piece of .004" (.102 mm) shim stock. See Fig. 4 .

Installation

1. Coat seal lips and seal bead with light engine oil. Keep oil off seal mating ends. Position tip of tool
between crankshaft and seal seat in cylinder block. Place seal between tip of tool and crankshaft, so that
seal bead contacts tip of tool.
2. Roll seal around crankshaft using tool as a "shoe horn" to protect seal bead from sharp corner of cylinder
block. Tool must be kept in position until ends of seal are seated flush with block. Carefully remove tool
without pulling seal out with it.
3. Install lower half of oil seal in bearing cap and apply sealer on cap-to-case interface. Install bearing cap
and tighten.
4. To line up main bearing thrust surfaces, tap end of crankshaft rearward and then forward. Tighten main
bearing cap bolts to specification.

FRONT ENGINE COVER

Removal

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Drain cooling system, remove belts, fan and pulley. Use torsional damper puller tool (J-23523 or equivalent) to
remove damper. Remove water pump. Remove front cover retaining bolts, cover and gasket.

Installation

1. Apply sealer to new gasket and a rubber sealer to joint formed where oil pan meets cylinder block. Place
gasket on cover and install cover-to-oil pan seal. Place cover over end of crankshaft and loosely install
cover-to-block screws.
2. Tighten screws alternately while pressing down on cover so that dowels are aligned with holes in cover.
Do not force cover over dowels as distortion of holes will result.
3. Install remaining screws. Install torsional damper using installer (J-23523 or equivalent). Install pulley,
fan, belts and water pump. Refill cooling system.

FRONT COVER OIL SEAL

Removal

The oil seal may be replaced without removing cover. Pry old seal outward with large screwdriver.

Installation

Install new seal with open end toward inside of cover. Drive seal into position using installer (J-23042 or
equivalent).

TIMING CHAIN

Removal

Remove front cover and use torsional damper retaining bolt to rotate crankshaft so timing marks are aligned.
Remove camshaft sprocket bolts. Use 2 large screwdrivers to alternately pry camshaft sprocket forward until
free.

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Fig. 5: Timing Chain Sprocket Alignment Align marks on camshaft and crankshaft sprockets.

Installation

1. With camshaft installed, place timing chain over camshaft sprocket so that it hangs below sprocket. Align
marks on camshaft and crankshaft sprockets. See Fig. 5 .
2. Align dowel in camshaft with dowel hole in camshaft sprocket. Install sprocket on camshaft. Use
mounting bolts to draw sprocket onto camshaft and tighten bolts. Check sprocket alignment, lubricate
chain with engine oil and reinstall other components.

CAMSHAFT

Removal

Remove intake manifold as previously described. Remove rocker arm assembly, push rods and lifters. Remove
radiator, grille, water pump and front engine cover. Remove fuel pump push rod. Install two 5/16 x 4" bolts in
camshaft bolt holes and carefully remove camshaft.

NOTE: All camshaft journals are same diameter. Use care when removing camshaft to

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5.0L (305") V8 - VINS [H & S] 1983 GENERAL MOTORS ENGINES 5.0L (305") V8 - VINS H & S

prevent damage to lobes or journals. If journals are more than .001" (.025 mm)
out-of-round, replace camshaft. If replaced, install all new lifters.

Installation

Lubricate journals with engine oil and apply Molykote or equivalent to camshaft lobes. Carefully install
camshaft. Complete installation by reversing removal procedure.

CAMSHAFT BEARINGS

Removal

1. With crankshaft and camshaft removed, drive camshaft plug out rear of cylinder block. Using camshaft
bearing remover tool (J-6098 or equivalent), remove center 2 bearings. Index pilot in front bearing and
install puller screw through pilot.
2. Install bearing remover tool with shoulder toward bearing. Make sure enough threads are engaged. With 2
wrenches, use 1 to hold puller screw, the other to turn nut.
3. Index pilot in rear bearing to pull rear intermediate bearing. Assemble remover tool on driver handle and
remove front and rear bearings by driving toward center of engine.

Installation

1. Install front and rear bearings first. These bearings act as guides for the pilot and center the remaining
bearings being pulled into place. Assemble tool on driver handle and install camshaft front and rear
bearings by driving toward center of block.

NOTE: No. 1 bearing should be installed so oil holes are equidistant from 6
o'clock position; No. 2 through No. 4 bearings should be installed with oil
holes at 5 o'clock position; No. 5 at 12 o'clock position.

2. Using camshaft bearing removal tool (J-6098 or equivalent), install 2 center bearings with oil holes
aligned with holes in block. Camshaft plug should be installed flush to 1/32" deep and parallel with
surface of block. Reverse removal procedure to complete installation.

CRANKCASE CAPACITY

Crankcase capacity including filter change is 5 quarts (4.7L).

NORMAL OIL PRESSURE

Oil pressure is 30-40 psi (2.1-2.8 kg/cm2 ) @ 2000 RPM.

PRESSURE REGULATOR VALVE

Pressure regulator valve is located in oil pump body and is not adjustable.

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5.0L (305") V8 - VINS [H & S] 1983 GENERAL MOTORS ENGINES 5.0L (305") V8 - VINS H & S

LUBRICATION
ENGINE OILING SYSTEM

Oil is supplied under pressure by a gear-type pump, driven by the distributor, which in turn is driven by a
helical gear on the camshaft. The main oil gallery (down center of block above camshaft on V8 engines, along
left bank of V6 engines) feeds oil through drilled passages to the camshaft and crankshaft to lubricate bearings.

The valve lifter oil gallery feeds valve lifters, which through hollow push rods feed individually mounted rocker
arms. All other components are lubricated by splash or nozzle.

OIL PUMP

Removal

Remove oil pan. Remove pump-to-rear main bearing cap bolt and remove pump and extension shaft.

Disassembly

1. Remove pump cover and mark gear teeth so they may be reassembled with same teeth indexing. Remove
idler gear and the drive gear and shaft from pump body.
2. Remove pressure regulator valve retaining pin, valve and related parts. Pull pickup screen and pipe
assembly from pump body, if replacement is necessary. Do not disturb pickup screen on pipe. This is
serviced as an assembly.

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5.0L (305") V8 - VINS [H & S] 1983 GENERAL MOTORS ENGINES 5.0L (305") V8 - VINS H & S

Fig. 6: Exploded View of Oil Pump Assembly

Reassembly

1. If pump gears or body are damaged or worn, replacement of entire pump assembly is necessary. Apply
sealer to end of replacement pickup tube and using installer (J-8369 ), tap tube in place with plastic
hammer. Install pressure regulator valve and related parts.
2. Install drive gear and shaft in pump body. Install idler gear in pump body with smooth side of gear
towards pump cover opening. Install pump cover and tighten screws. Turn drive shaft to ensure smooth
operation.

Installation

Install pump and extension shaft to rear main bearing cap. Align slot on top end of extension shaft with drive
tang on lower end of distributor drive shaft. Install pump to rear main bearing cap bolt and tighten.

WATER PUMP

Removal

1. Disconnect negative battery cable. Drain cooling system. Remove fan shroud or upper radiator support, if
necessary. Remove drive belts. Remove fan and pulley from water pump hub. Remove upper and lower
alternator brackets and power steering pump lower bracket from water pump (if equipped) and swing
aside.

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5.0L (305") V8 - VINS [H & S] 1983 GENERAL MOTORS ENGINES 5.0L (305") V8 - VINS H & S

2. Remove lower radiator hose and heater hose from water pump. Remove water pump to block attaching
bolts and remove water pump.

Installation

To install, reverse removal procedure, noting the following: If using a new pump, transfer pulley from old
pump. Use a new gasket.

NOTE: For further information on cooling system capacities and other cooling system
components, see ENGINE COOLING SYSTEMS article in this section.

TORQUE SPECIFICATIONS
TIGHTENING SPECIFICATIONS
Application Ft. Lbs. (N.m)
Camshaft Sprocket 20 (27)
Clutch Pressure Plate 35 (48)
Connecting Rod Cap 45 (61)
Crankcase Front Cover 80 (109)
Cylinder Head Bolts 65 (88)
Exhaust Manifold 20 (27)
Flywheel-to-Crankshaft 60 (82)
Intake Manifold Bolts 30 (41)
Main Bearing Cap Bolts 70 (95)
Oil Pump 65 (88)
Torsional Damper Bolt 60 (82)
Water Pump 30 (41)

ENGINE SPECIFICATIONS
GENERAL ENGINE SPECIFICATIONS

GENERAL SPECIFICATIONS
Application Specifications
Displacement
Cu. In. 305
Liters 5.0
Fuel System
VIN H 4-Bbl.
VIN S CFI
HP @ RPM
VIN H 150 @ 3800
VIN S 150 @ 3800

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Torque Ft. Lbs. @ RPM

VIN H 240 @ 2400
VIN S 240 @ 3200
Compr. Ratio
VIN H 8.6:1
VIN S 9.5:1
Bore 3.74 (95.0)
Stroke 3.48 (88.4)

VALVE SPECIFICATIONS

VALVE SPECIFICATIONS
Application In. (mm)
Head Diameter
Intake 1.84 (46.73)
Exhaust 1.50 (38.1)
Face Angle 45°
Seat Angle 46°
Seat Width
Intake .031-.063 (.79-1.60)
Exhaust .063-.094 (1.60-2.39)
Stem Diameter .3410-.3417 (8.661-8.679)
Stem Clearance .0010-.0027 (.025-.069)
Valve Lift
Intake .372 (9.45)
Exhaust .401 (10.18)

PISTON/PIN/RING SPECIFICATIONS

PISTONS, PINS, RINGS SPECIFICATIONS

Application In. (mm)
Piston Clearance .0007-.0017 (.018-.043)
Pins
Piston Fit .00025-.00035 (.0064-.0089)
Rod Fit (1) .0008-.0016 (.020-.040)

Ring No. 1
End Gap .010-.020 (.25-.51)
Side Clearance .0012-.0032 (.030-.081)
Ring No. 2
End Gap .010-.025 (.25-.64)
Side Clearance .0012-.0032 (.030-.081)
Ring No. 3

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 1983 Chevrolet Monte Carlo
5.0L (305") V8 - VINS [H & S] 1983 GENERAL MOTORS ENGINES 5.0L (305") V8 - VINS H & S

End Gap .015-.055 (.38-1.40)

Side Clearance .002-.007 (.05-1.29)
(1) Press fit.

BEARING SPECIFICATIONS

MAIN & ROD BEARINGS SPECIFICATIONS

Application In. (mm)
Main Bearings
Journal Diameter
Front 2.4484-2.4493 (62.189-62.212)
Intermediate 2.4481-2.4490 (62.182-62.205)
Rear 2.4479-2.4488 (62.177-62.199)
Clearance
Front .0008-.0020 (.020-.050)
Intermediate .0011-.0023 (.028-.058)
Rear .0017-.0032 (.034-.081)
Thrust Bearing No. 5
Crankshaft End Play .002-.006 (.05-.15)
Connecting Rod Bearings
Journal Diameter 2.0988-2.0998 (53.310-53.335)
Clearance .0013-.0039 (.046-.099)
Side Play .008-.014 (.203-.355)

VALVE SPRING SPECIFICATIONS

VALVE SPRINGS SPECIFICATIONS

Application In. (mm)
Free Length (1) 2.03 (51.56)

Pressure (2)
Valve Closed 76-84 @ 1.70 (34-38 @ 43.2)
Valve Open 194-206 @ 1.25 (88-93 @ 31.8)
(1) Damper spring is 1.86" (47.2 mm).

(2) Lbs. @ In. (kg @ mm).

CAMSHAFT SPECIFICATIONS

CAMSHAFT SPECIFICATIONS
Application In. (mm)
Journal Diameter 1.8682-1.8692 (47.452-47.478)

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 1983 Chevrolet Monte Carlo
5.0L (305") V8 - VINS [H & S] 1983 GENERAL MOTORS ENGINES 5.0L (305") V8 - VINS H & S

Lobe Lift
VIN H
Intake .238 (6.04)
Exhaust .260 (6.60)
VIN S
Intake .260 (6.60)
Exhaust .273 (6.93)

jueves, 22 de agosto de 2019 08:48:25 a. m. Page 18 © 2011 Mitchell Repair Information Company, LLC.