Chevrolet
Series M (copper-cooled)

How rare is it?

Six separate kinds of rarity – never combined into one number.

Each kind of rarity is rated separately and never combined.

Production

Every figure says what it counts.

Independent counts (e.g. engine and colour) are never combined into a calculated figure. Surviving examples are never presented as original production.

History

The air-cooled engine used U-shaped copper fins bonded to separately cast cylinders. It was priced about $200 above the water-cooled Superior B, weighed some 215 pounds less, but uneven air distribution made production engines overheat and detonate. Production stopped after 500 cars and nearly all were recalled; it was Chevrolet's last air-cooled attempt for nearly 40 years.

Technical specifications

Engine

Transmission & drivetrain

Chassis, body & dimensions

Performance

“Not yet verified” means no source has been checked for that value yet. Nothing is estimated to fill a gap.

Sources

Each number links to the exact facts it supports.

1. 1
   1923 Chevrolet Series M Copper-Cooled, HowStuffWorks (Consumer Guide) Level C

   • 500 Series M Copper-Cooled cars built

   Accessed 2026-11-12
2. 2
   1923 Chevrolet Series M Copper-Cooled Level C HowStuffWorks / Consumer Guide (Wayback capture)

   • 1,700 (approx.)

   Accessed 2026-11-13