
GMK431230973 Coolant Overflow Tank Cap 1973-1992 Most Gm Cars & Trucks
Goodmark 431230973 (GMK431230973) Replaces Part Number:
- 4312-309-73
Goodmark 431230973 (GMK431230973) Replaces OE Part Number:
- 340194
Keep Your Classic Running Cool with Goodmark Cooling Components
Maintain optimal engine temperature and restore original function with Goodmark Cooling Components, designed for classic car restorations and repairs. These OE-style parts include radiators, fan shrouds, heater cores, and more—engineered for direct fit and factory appearance. Constructed from high-quality materials, Goodmark ensures durability, performance, and authenticity in every component. Whether you're refreshing a vintage cruiser or completing a full restoration, trust Goodmark to keep your cooling system in top shape.

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