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 MANUALSCHEVROLET1987HI-CUBE 6.2 J, 400/M40REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 20 (VACUUM DIAGRAMS)INTRODUCTIONMODEL IDENTIFICATION

1987 Chevrolet Hi-Cube 6.2 J, 400/M40

Model Identification

1987 Chevrolet Hi-Cube 6.2 J, 400/M40SECTION Model Identification

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 1994 GMC Yukon, 1994 GMC Suburban, 1994 GMC Pickup, 1994 GMC Cab & Chassis, and 1994 GMC C3500 HD. However, it is still accessible from the selected car via links, so may be relevant.

Vehicle model can be identified by the fifth character of Vehicle Identification Number (VIN). See MODEL IDENTIFICATION . VIN is stamped on a metal pad at top left of instrument panel, near windshield.

MODEL IDENTIFICATION

Series ⁽¹⁾

Model

"C"

2WD Blazer ⁽²⁾, Pickup ⁽²⁾, Sierra & Suburban

"K"

4WD Blazer ⁽²⁾, Pickup ⁽²⁾, Sierra, Suburban & Yukon

⁽¹⁾	Vehicle Series is the fifth character of VIN.

⁽²⁾	Blazer and Pickup models are available in 2 sizes: "S" and "T" Series (smaller version), and "C" and "K" Series (larger version).

VACUUM DIAGRAM REFERENCE

Engine & Vehicle Series	Application	Trans.	Figure
4.3L V6 "C" & "K" Series	Calif. & Fed.	All	Fig. Figure
4.3L V6 "C" & "K" Series	Calif. & Fed.	All	Fig. Figure
4.3L V6 "C" & "K" Series	Calif.	All	Fig. Figure
4.3L V6 "C" & "K" Series	Fed.	All	Fig. Figure
5.OL V8 "C" & "K" Series	Calif.	All	Fig. Figure
5.0L V8 "C" & "K" Series	Calif.	All	Fig. Figure
5.7L V8 "C" & "K" Series	Calif.	All	Fig. Figure
5.7L V8 "C" & "K" Series	Fed.	All	Fig. Figure
5.7L V8 "C" & "K" Series	Calif./Fed.	All	Fig. Figure
6.5L V8 "C" & "K" Series	Fed. & High Alt.	All	Fig. Figure
7.4L V8 "C" Series	Calif./Fed.	All	Fig. Figure
7.4L V8 "C" Series	Calif./Fed.	All	Fig. Figure
7.4L V8 "C" Series	Fed. & High Alt.	All	Fig. Figure

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.