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HOMESERVICE MANUALSCHEVROLET1989STEP VAN P30, 3.9 L, AUTOMATIC, 400/M40REPAIR AND DIAGNOSISENGINE MECHANICALMECHANICAL6.2L V8 DIESEL - VINS [C,J]ENGINE SPECIFICATIONSCYLINDER HEAD SPECIFICATIONS
1989 Chevrolet Step Van P30, 3.9 L, Automatic, 400/M40

Cylinder Head Specifications

1989 Chevrolet Step Van P30, 3.9 L, Automatic, 400/M40SECTION Cylinder Head Specifications
CYLINDER HEAD SPECIFICATIONS

Application In. (mm)
Maximum Cylinder Head Warp (1) *
Valve Seat Angle
Intake 46°
Exhaust 46°
Valve Seat Maximum Runout
Intake .002 (.05)
Exhaust .002 (.05)
Valve Seat Width
Intake .035-.060 (.89-1.53)
Exhaust .061-.093 (1.57-2.36)
Valve Seat Bore Diameter
Intake N/A
Exhaust N/A
Valve Stem Oil Clearance
Intake .0010-.0027 (.026-.069)
Exhaust .0010-.0027 (.026-.069)
Valve Guide Inside Diameter
Intake N/A
Exhaust N/A
Valve Guide Bore
Intake N/A
Exhaust N/A
(1) Warpage should not exceed .006" (.15 mm), longitudinally or .003" (.08 mm) transversely. Resurfacing is not recommended.
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.