Chevrolet C60 Headlight Bulb Size

Additional Notes

• The Chevrolet C60 headlight bulb specifications cover model years 1960-1988 and involve three sealed beam bulb types: H6024, H4651, H4656, and H6054. All four conform to ANSI standards recognized in both the United States and Canada and operate at 12 volts.
• The H6024 is a 7-inch round sealed beam unit. It serves as both the high beam and low beam bulb on 2-headlamp configurations across nearly the full 1960-1988 model year range, making it the most broadly applied bulb type in these specifications.
• Because the H6024 functions as both the high beam and low beam in a 2-headlamp system, a single bulb type handles both lighting functions. This is characteristic of a dual-filament sealed beam design, where one unit contains separate filaments for each beam mode.
• On the Chevrolet C60 with 4-headlamp configurations, the high beam and low beam positions use different bulb types. The H4651 covers the high beam position, while the H4656 covers the low beam position. Both are 4x6-inch rectangular sealed beam units, though they are not interchangeable between positions.
• The H6054 is a 5x7-inch rectangular sealed beam unit. Its fitment in the C60 specifications is limited to the 1983 model year with a 2-headlamp configuration, where it replaces the H6024 used in surrounding years for the same headlamp count.
• All bulb types listed are sealed beam units, meaning the lens, reflector, and filament are fused into a single assembly. Replacement requires substituting the entire unit rather than an internal bulb component.
• The H4651 and H4656 share the same 4x6-inch rectangular form factor but are designated for different beam positions. Installing one in place of the other would place an incorrect beam pattern in a given headlamp position, as each is engineered for its specific role within a 4-headlamp system.
• For the 1983 model year specifically, the 2-headlamp configuration uses the H6054, while the 4-headlamp low beam position uses the H4656. This makes 1983 the only year in the specifications where the H6054 appears, and it does not apply to the 4-headlamp variant of that year.