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.
1974 GMC MagnavanFACTORY OEM SERVICE PROCEDURE
Tune-Up - V8: Ignition: Distributor: Notes
| Application | Delco Part No. | |
|---|---|---|
| 350" 2-Bbl. | ||
| Man. Trans. | 1112843 | |
| Auto. Trans. | 1112844 | |
| 350" 4-Bbl. 1500 Series | ||
| Suburban, Man. Trans. | 1112832 | |
| All Others, Man. Trans. Federal | 1112093 | |
| All Others, Man. Trans. California | 1112543 | |
| All, Auto. Trans. | 1112094 | |
| 350" 4-Bbl. 2500 & 3500 Series | 1112097 | |
| 454" | ||
| 1500 Series | 1112113 | |
| Suburban, 2500 Series | 1112504 | |
| All Others, 2500 & 3500 Series | 1112097 | |
Factory Service Tools
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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.
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