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Engine Mechanical 7.4L V8 - VIN [N]: Specifications GMC C3500 HD

Mechanical

Crankcase Capacity

See CRANKCASE CAPACITY table.

ApplicationQts. (L)
7.4L7.0 (6.6)
(1) Capacity includes oil filter.
(1)Capacity includes oil filter.

CRANKCASE CAPACITY (1)

TORQUE SPECIFICATIONS

ApplicationFt. Lbs. (N.m)
Bellhousing Bolt30 (41)
Camshaft Sprocket Bolt19 (26)
Connecting Rod Cap Nut49 (66)
Crankshaft Damper Bolt85 (115)
Cylinder Head Bolt (1)
Step 130 (40)
Step 259 (80)
Step 381 (110)
Exhaust Manifold Bolt40 (54)
Flywheel Bolt66 (90)
Intake Manifold Bolt(2) 33 (45)
Main Bearing Cap Bolt100 (135)
Oil Pan Bolt13 (18)
Oil Pump Bolt66 (90)
Rocker Arm Bolt40 (54)
Water Pump Bolt30 (40)
INCH Lbs. (N.m)
Front Cover Bolt89 (10)
Oil Pump Cover Bolt80 (9)
Valve Cover Bolt62 (7)
(1) Apply GM Sealant (1052080) to head bolt threads. Tighten bolts in sequence. (Схема №3) (2) Tighten bolts in sequence. (Схема №2)
(1)Apply GM Sealant (1052080) to head bolt threads. Tighten bolts in sequence. (Схема №3)
(2)Tighten bolts in sequence. (Схема №2)

TORQUE SPECIFICATIONS

GENERAL ENGINE SPECIFICATIONS

ApplicationSpecification
Displacement454 Cu. In. (7.4L)
Bore4.25" (108.0 mm)
Stroke4.00" (101.6 mm)
Compression Ratio7.9:1
Fuel SystemTBI
Horsepower @ RPM230 @ 3600
Torque Ft. Lbs. @ RPM385 @ 1600

GENERAL SPECIFICATIONS

CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS SPECIFICATIONS

ApplicationIn. (mm)
Crankshaft End Play.006-.010 (.15-.25)
Main Bearings
Journal Diameter2.7482-2.7489 (69.804-69.822)
Journal Out-Of-Round.001 (.03)
Journal Taper.001 (.03)
Oil Clearance
Standard
No. 1, 2, 3 & 4.0017-.0030 (.043-.076)
No. 5.0025-.0038 (.064-.097)
Service Limit
No. 1, 2, 3 & 4.0010-.0030 (.025-.076)
No. 5.0025-.0040 (.064-.102)
Connecting Rod Bearings
Journal Diameter2.1990-2.1996 (55.855-55.870)
Journal Out-Of-Round.001 (.03)
Journal Taper.001 (.03)
Oil Clearance.0011-.0029 (.028-.074)

CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS

CONNECTING RODS SPECIFICATIONS

ApplicationIn. (mm)
Side Play.013-.023 (.33-.58)

CONNECTING RODS

PISTONS, PINS & RINGS SPECIFICATIONS

ApplicationIn. (mm)
Piston Clearance.0018-.0030 (.046-.076)
Pins
Diameter.9895-.9897 (25.133-25.138)
Piston Fit.0002-.0007 (.005-.018)
Rod Fit.0021-.0031 (.053-.079) Interference
Rings
No. 1
End Gap.010-.018 (.25-.46)
Side Clearance.001-.003 (.03-.07)
No. 2
End Gap.016-.024 (.41-.61)
Side Clearance.001-.003 (.03-.07)
No. 3 (Oil)
End Gap.010-.030 (.25-.76)
Side Clearance.005-.007 (.13-.18)

PISTONS, PINS & RINGS

CYLINDER BLOCK SPECIFICATIONS

ApplicationIn. (mm)
Cylinder Bore
Diameter4.2500-4.2507 (107.950-107.968)
Maximum Taper(1) .0005 (.013)
Maximum Out-Of-Round(2) .001 (.03)
(1) Specification is for thrust side. Relief side is .001" (.03 mm). (2) Production specification is given. Maximum service specification is .002" (.05 mm).
(1)Specification is for thrust side. Relief side is .001" (.03 mm).
(2)Production specification is given. Maximum service specification is .002" (.05 mm).

CYLINDER BLOCK

VALVES & VALVE SPRINGS SPECIFICATIONS

ApplicationSpecification
Valve Face Angle45°
Valve Springs
Free Length2.12 (53.8)
Installed Height1.84 (46.7)
Pressure (1)
Valve Closed76-84 @ 1.84 (35-38 @ 46.7)
Valve Open205-225 @ 1.41 (93-102 @ 35.8)
(1) Lbs. @ In. (Kg @ mm).
(1)Lbs. @ In. (Kg @ mm).

VALVES & VALVE SPRINGS

CYLINDER HEAD SPECIFICATIONS

ApplicationSpecification
Valve Seats
Intake Valve
Seat Angle46°
Seat Width.035-.060" (.89-1.52 mm)
Maximum Seat Runout.002" (.05 mm)
Exhaust Valve
Seat Angle46°
Seat Width.063-.094" (1.60-2.39 mm)
Maximum Seat Runout.002" (.05 mm)
Valve Guide Oil Clearance.001-.003" (.03-.08 mm)

CYLINDER HEAD

CAMSHAFT SPECIFICATIONS

ApplicationIn. (mm)
Journal Diameter1.9477-1.9497 (49.472-49.522)
Lobe Lift
Intake(1) .2487 (6.317)
Exhaust(1) .2537 (6.444)
(1) Plus or minus .002" (.05 mm).
(1)Plus or minus .002" (.05 mm).

CAMSHAFT

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