Chevrolet B60 Headlight Bulb Size

Additional Notes

• The Chevrolet B60 headlight bulb specifications cover the 1980-1991 model years, with two distinct headlamp system configurations present throughout: a 2-headlamp setup and a 4-headlamp setup, each requiring different bulb sizes across both high beam and low beam positions.
• The H6024 is the most frequently specified bulb across the B60 lineup, appearing in both high beam and low beam positions for the 2-headlamp configuration across the majority of model years covered. It is a 7-inch round sealed beam unit operating at 12V and conforming to ANSI standards applicable in the US and Canada.
• All bulb types listed for the Chevrolet B60 are sealed beam units, meaning the entire lamp assembly is replaced as a single unit rather than replacing an internal filament or capsule. This applies to every size specified across both headlamp configurations.
• The H4651 and H4656 are both 4x6-inch rectangular sealed beam units rated at 12V under ANSI standards. On the B60, H4651 serves the high beam position in 4-headlamp systems, while H4656 serves the low beam position in the same configuration, making the two non-interchangeable despite their shared physical format.
• The H4652 is a variant of the H4651 and shares the same 4x6-inch rectangular sealed beam format. On the B60, it appears specifically in the low beam position of 4-headlamp systems for the 1987-1988 model years, replacing the H4656 that is otherwise used in that position across other years.
• The H6054 is a 5x7-inch rectangular sealed beam unit rated at 12V. It is specified for the Chevrolet B60 in both the high beam and low beam positions for the 1983-1984 model years, covering both 2-headlamp and 4-headlamp configurations in those years.
• In 4-headlamp systems, the high beam and low beam positions require separate, dedicated sealed beam units. Substituting a high beam unit such as the H4651 in place of a low beam unit such as the H4656 would represent an incorrect fitment, as the two serve distinct optical functions despite sharing the same physical housing size.
• The H6024 round sealed beam format and the H4651/H4656 rectangular sealed beam format represent two physically incompatible headlamp housing types. A vehicle fitted with round headlamp housings requires the H6024, while one fitted with rectangular housings requires the appropriate 4x6-inch unit, and the two formats are not interchangeable.