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 MANUALSCHEVROLET1989STEP VAN P30, 4.8 T, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE MECHANICALMECHANICAL7.4L V8 - VINS [N,W]ENGINE SPECIFICATIONSCYLINDER HEAD SPECIFICATIONS
1989 Chevrolet Step Van P30, 4.8 T, Standard
Cylinder Head Specifications
1989 Chevrolet Step Van P30, 4.8 T, StandardSECTION Cylinder Head Specifications
CYLINDER HEAD SPECIFICATIONS
| Application | In. (mm) | ||
|---|---|---|---|
| Intake | |||
| Max Cylinder Head Warp | N/A | ||
| Valve Seats | |||
| Seat Angle | 45° | ||
| Maximum Runout | .002 (.05) | ||
| Seat Width | .031-.063 (.78-1.60) | ||
| Seat Bore Diameter | N/A | ||
| Valve Guides | |||
| Valve Stem Oil Clearance | .0010-.0027 (.025-.068) | ||
| Valve Guide I.D. | N/A | ||
| Valve Guide Bore I.D. | N/A | ||
| Exhaust | |||
| Max Cylinder Head Warp | N/A | ||
| Valve Seats | |||
| Seat Angle | 46° | ||
| Maximum Runout | .002 (.05) | ||
| Seat Width | .063-.094 (1.60-2.38) | ||
| Seat Bore Diameter | N/A | ||
| Valve Guides | |||
| Valve Stem Oil Clearance | .0012-.0029 (.030-.073) | ||
| Valve Guide I.D. | N/A | ||
| Valve Guide Bore I.D. | N/A | ||
RENDER: 1.0x
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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.