Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSGMC1974SPRINT BASE, 5.7L ENG VIN L, STANDARD TRANSREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE MECHANICALMECHANICALENGINE MECHANICAL - SMALL BLOCK V8CYLINDER HEADINSTALLATION

1974 GMC Sprint Base, 5.7L Eng VIN L, Standard Trans

Cylinder Head: Installation

1974 GMC Sprint Base, 5.7L Eng VIN L, Standard TransSECTION Installation

Gasket surfaces of both head and cylinder block must be clean. Use sealer if equipped with steel gasket. If asbestos gasket is being used, sealer is not required. Position heads and gaskets on cylinder block. Coat threads of bolts with a sealing compound. Tighten cylinder head bolts in sequence shown in illustration. To complete installation, reverse removal procedure.

Fig 1: CYLINDER HEAD TIGHTENING SEQUENCE

Courtesy of GENERAL MOTORS COMPANY

VALVES

Engine & Valve

Head Diam.

Face Angle

Seat Angle

Seat Width

Stem Diameter

Stem Clearance

Valve Lift

1965-74

283"

Int.

1.720"

45°

46°

.031-.063"

.3404-.3417"

.0010-.0027"

.....

Exh.

1.500"

45°

46°

.063-.094"

.3410-.3417"

⁽¹⁾.0010-.0027"

.....

307"

Int.

1.720"

45°

46°

.031-.063"

.3410-.3417"

.0010-.0027"

.....

Exh.

1.500"

45°

46°

.063-.094"

.3410-.3417"

.0010-.0027"

.....

327"

Int.

1.940"

45°

46°

.031-.063"

.3410-.3417"

.0010-.0027"

.....

Exh.

1.500"

⁽²⁾ 45°

46°

.063-.094"

.3410-.3417"

.0010-.0027"

.....

350"

Int.

1.940"

45°

46°

.031-.063"

.3410-.3417"

.0010-.0027"

.....

Exh.

1.500"

⁽²⁾ 45°

46°

.031-.063"

.3410-.3417"

.0010-.0027"

.....

⁽¹⁾	Stem clearance for 1965-66 283" exhaust valves is.0015-.0032".

⁽²⁾	Face angle for 1968 327" and 1969 350" exhaust valvesis 46°.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.