- Can-Am cars as raced after 1967 on slicks
- World Championship for Makes sports cars raced after 1970 on slicks
- Under 2.0 liter sports cars
- Center seat Can-Am cars
- SCCA ASR, BSR, CSR
- Historic Sports 2000
Background and philosophy: These cars shall be prepared as they were during their competitive racing period. Since racing technology progressed very rapidly during this period, there may be different specifications/configurations that are period correct. These cars shall have been manufactured before December 31, 1989 . There were many one-off or very low production cars produced that ran in ASR, BSR, and CSR in the U.S., as well as other FIA categories around the world. This list could never cover all of the possible makes and configurations so other cars not included on this list can be submitted for approval on a case-by-case basis.
Modifications: These cars must be prepared to the configuration they were originally designed and constructed; otherwise, it is the responsibility of the competitor to provide documentation for any specification that does not align with common class configurations. Since these cars mostly ran in open categories, there will be variations within a particular make and model that are period correct. In all cases, they are expected to have period equipment and specifications.
Approved Tires: Racing slicks and treaded tires, either molded or hand cut. While exact size and aspect ratio are not specified, entrants must ensure that the tire choice is appropriate for the car and for the eligibility period.
Can-Am and ASR 2.0L Sports Cars, BSR, CSR, Center Seat CanAm
BRM P167 Abarth 021,2000SP
Chapparal (Chevrolet) AMS 273, 1300
Delta Ti22 Bobsey SR
Ferrari 512/612/712 Chevron B19, 21, 23, 26, 31, 36
Frissbee Lola T210/212, 290-298, 390,496
GRDS72 Mallock U2
Lola T70/160-165 (7.4L Chevrolet) March 73S
Lola T220/222/260/310 (8.1L Chevrolet) Royale RP4, 4a, 4/6, 6, 10, 17
Lola T333CS, T530
March 707,717 (8.1L Chevrolet) World Championship for Makes
Matich SR-3 Alfa T33/3 & T33TT/3
McLaren M6A, M6B (5.7L Chevrolet) Alpine A442-Renault
McLaren M8B, M8C/M8E/M8F Chevron B31
(7.6L/8.1L Chevrolet) Ferrari 312P & BP (3.0L)
McLaren M12, M20 Ferrari 512S & M (5.0L)
McKee (7.2L Chevrolet) Lola T280-286, 380 (3.0L)
Porsche 908 (3.0L, flat 8) March 75S
Porsche 917PA, 917/10 & 30 (5.0L/5.4L flat 12) Matra-Simca MS670
TOJ SS-02 Mirage M6, M8 (3.0L)
UOP Shadow DN4A (8.1L Chevrolet) Porsche 908/03 (3.0L)
Porsche 917K, 917/20 (4.5/5.0L)
Porsche 936 (2.2L turbo)
Historic Sports 2000
SOVREN has adopted the classification and preparation rules of the North America Chapter of SRCC for the Historic Sports 2000 cars.
HS2 (Historic Sports 2000) includes cars produced before 12/31/1984
Typical HS2 cars include:
Aquila RO82S
Chevron B52, B54, B60
Crossle 37S, 42S, 47S
Elden PRH23
Lola T-490, T-492, T-590, T-592S, T-596
March 81S, 82S, 83S, 84S
Martin MRC/81 (Mariah)
Ocelot Mk5B, Mk6A, Mk8
Robinson RS2
Royale S2000M, RP37
Shrike P15
Tiga SC78, SC79, SC80, SC81, SC82, SC83, SC84