Chrysler 300 Letter Series
The first American muscle car — 300 horsepower in 1955 before anyone else was even trying.
The Chrysler 300 Letter Series is the legitimate ancestor of the American muscle car. The 1955 C-300 produced 300 horsepower from a dual-carbureted FirePower Hemi — the first American production car to achieve that output. Named alphabetically (C-300, 300B through 300L, skipping I), each year offered genuine performance credentials that embarrassed European sports cars at the Daytona Speed Week.
History
Chief engineer Bob Rodger and stylist Virgil Exner conceived the C-300 as a dual-purpose car: luxury transport and racing machine. The 300 hp rating was not incidental — it was the marketing headline. At Daytona Speed Week in 1955, Tim Flock drove a C-300 to an unofficial flying-mile record. The letter cars won at Daytona in 1955 and 1956.
Each successive letter added refinements: the 300D (1958) featured Bendix electrojector fuel injection (briefly, before reliability issues caused reversion to carbs). The 300F (1960) wore Virgil Exner's most dramatic forward-thrust styling with Ghia-designed bucket seats imported from Italy — widely considered the most beautiful Letter Series car. The 300J (1963) skipped the letter I entirely to avoid confusion. The series ended after the 300L in 1965 as the muscle car era shifted to less expensive mid-size cars.
Notable Versions
1955 C-300
The original. 300 hp FirePower Hemi. The first American car most historians call a true muscle car.
300F (1960)
Exner's most dramatic styling with Italian-made bucket seats. The design pinnacle of the Letter Series.
300J (1963)
390 hp, the highest-output Letter Series car. "I" was skipped; 400 hp was the original target but not achieved.
300L (1965)
The final Letter Series car. 360 hp, four-wheel disc brakes optional. The last of a breed.
What to Look for When Buying
Key inspection points from experienced collectors.
Documentation by year is critical
Each Letter Series year has different authentication points. Use the Chrysler 300 Club International registry for all verification.
Early Hemi engines are expensive to restore
The 392 FirePower Hemi is a different engine from the 426 Street Hemi. Parts are scarcer and machining expertise more specialized.
300F is the most valuable non-1955 Letter
The 1960 300F commands the highest prices after the original C-300 due to its design purity. Ghia bucket seat condition is critical.
Quick Specs
- Engine options
- FirePower Hemi 331–392 ci, then RB 413–426 ci
- Horsepower
- 300 hp (1955 C-300) → 390 hp (1963 300J)
- Wheelbase
- 126 in
- Transmission
- PowerFlite/TorqueFlite automatic; 4-spd manual (some years)
Market Price Guide
Approximate USA asking prices
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