Chevrolet C50 Headlight Bulb Size

The Chevrolet C50 high beam and low beam headlight bulb sizes include H6024, H4651, H4656, and H6054 options, with each bulb size corresponding to specific vehicle configurations. The replacement chart covers 1960 through 1988 production years with detailed bulb specifications for each model year.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

High Beam Headlight

Years	Bulb Size
1984-1988	H6024 (With 2 Headlamps)
1984-1988	H4651 (With 4 Headlamps)
1983	H6054 (With 2 Headlamps)
1960-1982	H6024 (With 2 Headlamps)
1960-1982	H4651 (With 4 Headlamps)

Low Beam Headlight

Years	Bulb Size
1984-1988	H6024 (With 2 Headlamps)
1984-1988	H4656 (With 4 Headlamps)
1983	H6054 (With 2 Headlamps)
1960-1982	H6024 (With 2 Headlamps)
1960-1982	H4656 (With 4 Headlamps)

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). 7-inch round sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H6024
ANSI standard (US & Canada). 4x6-inch rectangular sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H4651
ANSI standard (US & Canada). 5x7-inch rectangular sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H6054
ANSI standard (US & Canada). 4x6-inch rectangular sealed beam unit. Not a replaceable bulb — the entire unit is replaced. 12V.	H4656

Other Locations

Additional Notes

The Chevrolet C50 headlight bulb specifications cover model years 1960-1988 and involve four sealed beam bulb types: H6024, H4651, H6054, and H4656. All four conform to ANSI standards recognized in both the United States and Canada and operate on 12V electrical systems.
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 of the C50 across nearly the full model year range, making it the most widely specified bulb type in these data.
Because the H6024 functions as both high and low beam in a 2-headlamp setup, a single bulb type handles the full range of forward lighting in that configuration. This is a characteristic of older sealed beam designs, where a single unit contains both filaments.
The H4651 and H4656 are both 4x6-inch rectangular sealed beam units used exclusively in 4-headlamp configurations. The H4651 covers the high beam position and the H4656 covers the low beam position, meaning the two types are not interchangeable with each other despite sharing the same physical format.
All four bulb types are sealed beam units, meaning the lens, reflector, and filament are fused into one assembly. Replacement requires swapping the entire unit rather than just an internal bulb.
The H6054, a 5x7-inch rectangular sealed beam unit, is specified only for the 1983 model year in the 2-headlamp configuration, covering both the high beam and low beam positions for that year.
The headlamp count, either 2 or 4, is a critical fitment variable for the C50. A vehicle with a 4-headlamp system requires the H4651 for high beam and H4656 for low beam, while a 2-headlamp system uses the H6024 for both functions in most years. Installing a bulb specified for the wrong headlamp count would result in an incorrect fit.
The H4651 and H4656 share the same 4x6-inch rectangular form factor but carry different ANSI designations because they are engineered for different beam functions. Substituting one for the other in a 4-headlamp system would place the wrong beam pattern in the wrong position.