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The 1973 Trans-Am Series was the eighth running of the Sports Car Club of America's premier series. It began on April 15 and ran for six rounds. Due to the decline of demand for muscle cars in the early seventies and the energy crisis that year, 1973 is considered to be the beginning of the decline of Trans Am. In contrast to American muscle dominating previous years, Porsche won the manufacturers' championship this year. 1973 also saw the rise of silhouette cars as a way of adapting to the decline of performance cars, ultimately making the cars interchangeable with IMSA GTO and GTU.

Results

Round	Date	Circuit	Duration	Winning driver	Winning vehicle
1	April 15	Road Atlanta	315 miles	Peter Gregg	Porsche Carrera
2	May 5	Lime Rock	310 miles	Milt Minter	Porsche Carrera
3	June 16	Watkins Glen	243 miles	Maurice Carter	Chevrolet Camaro
4	July 15	Sanair	182 miles	Warren Agor	Chevrolet Camaro
5	July 28	Road America	312 miles	John Greenwood	Chevrolet Corvette
6	August 19	Edmonton	316 miles	John Greenwood	Chevrolet Corvette

Championships

Driver

1. Peter Gregg – 56 points
2. Al Holbert – 49 points
3. J. Marshall Robbins – 42 points
4. Warren Agor – 39 points
5. Jerry Thompson – 34 points

Manufacturer

1. Porsche – 31 points
2. Camaro – 28 points
3. Chevrolet Corvette – 23 points
4. Ford Escort – 3 points

References

1. "Archived copy" (PDF). Archived from the original (PDF) on May 13, 2013. Retrieved April 22, 2013.{{cite web}}: CS1 maint: archived copy as title (link)
2. Shortened from initial 310 due to heavy fog

• Trans-Am Series
• 1973 in American motorsport