HSR 2021 RACE / ENDURO CLASSES (updated 1/8/21) Grp 2 Class Vintage Sports Cars & Sedans as produced and raced thru +/- 1967 Enduro Special (VP) Vintage Production Cars, thru ~ 1967 VP/1 SCCA A/B-Production (early): Corvette C-1 (283); Aston Martin; Ferrari; Jaguar 120/140/150, XKE (3.8); Porsche 356 Carrera/GS, etc. V3 IAC VP/2 SCCA C-Production (early): Lotus S7, Elan, Europa; Ginetta G4; Morgan SS; Alfa GTZ, etc. V3 IAC VP/3 SCCA D-Production (early): A-Healey 3000; Datsun 2000; Porsche 356, 911 (FIA); TR4; Morgan +4; Volvo P1800; Yenko Stinger, etc. V4 IAC VP/4 SCCA E-Production: A/R Giulia; A-H 100-4/6; MGB; Fiat 124; Elva Courier; Morgan 4/4; 356 (drum), 912; TR3, GT6; Turner 1500; TVR, etc. V5 IAC VP/5 SCCA F-Production: Datsun 1600; Spridget 1275; Spitfire 1296/1500; MGA; Sunbeam Alpine; Fiat 124, etc. V5 IAC VP/6 SCCA G-Production: A/R Giulietta; Datsun 1500; Fiat X1/9; Spridget 1100; Spitfire 1147; Turner 950, etc. V5 IAC VP/7 SCCA H-Production: Sprite 948; Fiat 850; Fiat Abarth; MG TC/TD/TF; Opel GT, etc. V5 IAC S/5 Vintage B-Sedans, etc. (over 1.5L): BMW 1500/1600; Jaguar Mk II; Corvair; Volvo 544/122; Lotus Cortina, etc. V4 IAC S/6 Vintage C-Sedans, etc. (under 1.5L): BMW 700; Mini; Fiat; Abarth; NSU; Saab, etc. V5 IAC (VM) Vintage Sports Racing Cars (Modifieds), pre ~ 1961 VM/1 SCCA B, C -Modifieds (Over 3.0L): Devin, Jaguar; Echidna; Lister; Scarab; Ferrari; Bocar, etc. V3 VM/2 SCCA D-Modifieds (2.0L - 3.0L): Aston Martin; Ferrari; Maserati, etc. V4 VM/3 SCCA E, F-Modifieds (1.2L - 2.0L): Porsche RSK, RS 60, 61; Lotus 11, 15, 17; Elva II-VI; Lola I; OSCA, etc. V5 VM/4 SCCA G, H-Modifieds (Under 1.2)L: Bandini; Berkeley; Elva; Lotus; Jabro; Devin, etc. V5 (VSR) Vintage Sports Racing Cars, 1961 ~ 1967 VSR/3 C-Sports Racers, under 1.3L: Merlyn, Landar; Lotus; Royale; Bobsy, etc. V3 VSR/4 D-Sports Racers, H-Modifieds, under 1.0L: Bobsy; Ocelot; LeGrand; Quasar; Jabro; Tanner; Panhard, etc. V5 (SS) Street Stock Series SS/D Street Stock Touring : (Firehawk, Escort, IT, Motorola, Luk, etc.) [may use Gr3 tires] see HSR Street Stock Category Rules V4 IAC 2X Unspecified cars running in group but not eligible for awards, points or podium VX Grp 3 Class Vintage Sports Cars & Sedans as produced and raced thru +/- 1985 Enduro Special (HP) Historic Production Cars post ~ 1967 HP/5 *SCCA B-Production: Shelby GT350; Corvette (327); Porsche 904/GTS; XKE (4.2) *(limited prep) V2 IAC IAC HP/6 SCCA GT3: Porsche 914/6 (2.2/2.4); 911 (2.2/2.5); Datsun 280Z; MGB/V8 (3.5), Porsche RS (2.7) Spec 911 (3.0), etc. V2 **RS Cup HP/7 SCCA C-Production (late): Porsche 911R 2.0L, 914/6GT 2.0L; Datsun 240/260Z; Lotus 26R, 47, Sunbeam Tiger, etc. V3 IAC HP/8 SCCA D-Production (late): Jensen Healey; TR6; Porsche 914, 914/6 (2.0, single plug), 924, 944; Mazda RX7; A/R Spider, etc. V4 IAC S/2 *Early SCCA A-Sedan: 5.0L limit: Mustang; Barracuda, Valiant, Dodge Dart; Falcon, etc. *(limited prep) V2 IAC S/3 IMSA RS Sedans: post 1972 specs (IMSA RS, SCCA 2.5 Challenge, etc.): VW Rabbit, Colt, Pacer, Gremlin, Charger, RX2/3, Vega, etc. V3 IAC S/4 SCCA B-Sedan: pre 1972 specs: Datsun 510, 610; Alfa GTV; BMW 2002; Pinto; Toyota; Volvo 142/144, etc. V4 IAC H/PC Small-bore production [ProdCar]: (post 1972 SCCA H/P, G/P, F/P, GT4/GT5 specs - slicks allowed) VX MP/3 Modified Production GT & Sedans: cars deemed appropriate for Gr. 3, modified beyond approved specifications V2 IAC (SS) Street Stock Series ST/C Street Tuner C: Street Stock cars with limited modifications including aero enhancements by application and individual acceptance VX IAC SS/B Street Stock Grand Sport: (Firehawk, Escort, IT, Motorola, Luk, etc.) see HSR Street Stock Category Rules V3 **RS Cup SS/C Street Stock Sport: (Firehawk, Escort, IT, Motorola, Luk, etc.) see HSR Street Stock Category Rules V4 IAC (VSR) Vintage Sports Racing Cars VSR/1 SCCA CSR/USRRC (1964 ~ 72) under 1.6L: Royale RP; Bobsy; Lotus 23c; Brabham, etc. V1 VSR/2 SCCA E/F-Modified (thru ~ 1964) under 1.6L: Lotus 23b; Elva Mk 7/8; Merlyn, etc. V1 (MSR) Modern Sports Racing Cars MSR/3 Modern Sports Racers: Spec Racer Ford (SRF); Toyota WSR, Sports Renault, etc. V1 3X Unspecified cars running in group but not eligible for awards, points or podium VX **RS Cup Eligible Cars are Porsche RS 2.7, Spec 911 3.0, and Porsche 911SC Enduro See Grp 4 GT3 Vintage/Historic/Modern Formula (Open-wheeled) Cars Note 2 Special 4a (VF) Vintage Formula Cars Classic Monoposto (Monoposto Racing rules apply) {approved treaded tires} VF/1 Formula 1/2; pre 1973 NE VF/2 Formula B; pre 1973 (1600cc) NE VF/3 Club Ford; post 1973 (1600cc-spec tires) NE VF/4 Formula Ford; pre 1973 (1600cc-spec tires) NE VF/5 Formula Junior (rear engine) (1100cc) NE VF/6 Formula Vee, Front engine FJ (1100cc) NE (HF) Historic Formula Cars 4b Monoposto Formula 70 (1973 - 1979) (Monoposto Racing F/70 rules apply) {slicks} HF/1 Formula 1 / Formula 5000 / Formula A (over 2.0L) NE HSR 2021 RACE / ENDURO CLASSES (updated 1/8/21) HF/2 Formula 2 (2.0L) NE HF/3 Formula B/Atlantic (1600cc) NE HF/4 Formula C/Continental/Super Vee NE 4c (MF) Modern Formula Cars, post 1979 See Note 1 MF/1 F/1, Indy Car; post 1990 NE See Note 1 MF/2 F/1, Indy Car; pre 1990, also modern Indy Lights (02-15) NE MF/3 Indy Lights, F/3000, F/Holden, etc. NE MF/4 F/2, Toyota Atlantic, etc. NE See Note 1 MF/5 FF2000, F/Continental, etc. NE 4X Unspecified cars running in group but not eligible for awards, points or podium NE Note 1: Post 2016 cars may run but will not be eligible for points or podium (HSR Five Year Rule) Note 2: Formula cars are not eligible for enduros Grp 5 Class Classic Big-Bore Sportscars and Sedans Enduro Special (HP) Historic Production Cars, 1967 +/- 1975 (listed treaded tires) HP/1 SCCA A-Production: Corvette C-2/3 454/427; Cobra 427, etc. GTC2 IAC HP/2 SCCA B-Production: Corvette C-2/3 327/350; Shelby GT350; AMX; Jaguar XKE, XJS, XKE V12; Ferrari GTB, Porsche 930; 904 GTS,etc. GTC3 IAC IAC HP/3 Porsche RS Cup: Porsche 911 RSR, IROC (3.0); 911 SC, etc. GTC3 **RS CUP IAC HP/4 SCCA GT2: BMW 3.0/3.5 CSL; MGB/GT V8 (3.9-4.2); Porsche 911 (2.8); 914/6 (2.5), etc. GTC4 **RS CUP H/TA Classic Trans-Am thru 1973 (5.0L): Camaro; Firebird; Mustang; Boss 302; Barracuda; Javelin, etc. GTC3 IAC S1 American Sedans (over 5.0L): Mustang; Camaro; Dodge; Plymouth Barracuda; Firebird, etc. GTC4 IAC (MP) Modified Production Cars, 1967 +/- 1975 (listed treaded tires) MP/1 Modified Production GT & Sedans, over 5.8L: cars deemed appropriate for Gr 5, modified beyond approved specifications GTC1 IAC MP/2 Modified Production GT & Sedans, under 5.8L: cars deemed appropriate for Gr 5, modified beyond approved specifications GTC2 IAC GTU IMSA 1975 - 1984 GTU/SCCA GT2/3, under 3.0L: (slicks permitted) H7 (SS) Street Stock Series SS/AA Street Stock Supercars , etc: Corvette ZR1; Dodge Stealth; Lotus Esprit; Ferrari 348/355; Nissan 300ZX-T; Porsche 911/T; Mazda RX7/T, etc. GTC3 IAC SS/A Street Stock Super Sport: (GrandAm-ST, Firehawk, Escort, IT, Motorola, Luk, etc.), see HSR Street Stock Category Rules GTC4 IAC ST/B Street Tuner B: Street Stock cars with limited modifications including aero enhancements by application and individual acceptance GTC2 Select USRRC/FIA World Sportscar Championship coupes {listed treaded tires} V/ASR ASR/USRRC over 2.0L: Cheetah; Corvette GS; Corvair V8; Daytona Coupe; Brabham BT8, etc. GTC2 V/BSR BSR/USRRC under 2.0L: Porsche 906; Elva BMW; Chevron B16; Lola T210/212, etc. GTC2 5X Unspecified cars running in group but not eligible for awards, points or podium GTCX **RS Cup Eligible Cars are Porsche 911 RSR, IROC 3.0, 911 SC, 911 2.8 Grp 6 Class Historic / Post-Historic / Modern Era Prototypes Enduro Special ( FIA) LeMans Prototypes / World Sports Cars / Daytona Prototypes See Note 3 6X Current FIA/IMSA Prototypes (post '16): Ligier; Audi R18e; Nissan, Toyota TS; Porsche 919, HPD/ARX-03; Toyota B12/60, etc. PX See Note 3 LMP1 IMSA/FIA Prototypes (P1/LMP1/LMP900/LMGTP/SR1) post '98: Audi R8/10; Pescarolo; Peugeot 908; Lola B2K, etc. P1 See Note 3 LMP2 IMSA/FIA Prototypes (P2/LMP2/LMP675/SR2/PC) post '98: Oreca FLM 09; Porsche RS Spyder; Pilbeam; Lola; Courage; Acura, etc. P2 See Note 3 LMP3 IMSA Lites/FIA Prototypes (P3/LMP3) Ginetta; Ligier; Norma; Duqueine; ADESS, etc. P3 WSC FIA World Sports Cars (WSC) '94-98: Ferrari 333SP; R&S III; Kudzu; Cannibal; Hawk; Spice; Chevron, etc. P2 DP/1 GrandAm/IMSA Daytona Prototypes (Gen 3) '12-15: Corvette Coyote DP; Riley XXVI P1 DP/2 GrandAm/IMSA Daytona Prototypes (Gen 1/2) '03-11: Riley XI/XX; Doran; Crawford; Dallara, etc. P2 IMSA GTP / FIA Group C GTP FIA Group C, IMSA GTP: Lola T600; Nissan; Toyota; Jaguar XJR; Porsche 956/962, etc.