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HSR 2021 RACE / ENDURO CLASSES (updated 1/8/21)

Grp 2 Class Vintage Sports & 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); ; ; Jaguar 120/140/150, XKE (3.8); 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; 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; , 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 ; 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; , etc. V4 IAC S/6 Vintage C-Sedans, etc. (under 1.5L): BMW 700; ; 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; ; Ferrari; Bocar, etc. V3 VM/2 SCCA D-Modifieds (2.0L - 3.0L): Aston Martin; Ferrari; , 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 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; RX7; A/R Spider, etc. V4 IAC S/2 *Early SCCA A-: 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; ; 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; , 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: (SRF); Toyota WSR, Sports , 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 ; pre 1973 (1600cc-spec tires) NE VF/5 (rear engine) (1100cc) NE VF/6 , 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 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 ; post 1990 NE See Note 1 MF/2 F/1, Indy Car; pre 1990, also modern (02-15) NE MF/3 Indy Lights, F/3000, F/, 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; ; Ferrari 348/355; 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; 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: /10; Pescarolo; 908; Lola B2K, etc. P1 See Note 3 LMP2 IMSA/FIA Prototypes (P2/LMP2/LMP675/SR2/PC) post '98: 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; , etc. P2 IMSA GTP / FIA GTP FIA Group C, IMSA GTP: ; Nissan; Toyota; Jaguar XJR; /962, etc. P4 GTPL FIA Group C2, IMSA Camel Lights: Spice; Kudzu; Tiga; Alba; Argo; etc. P5 6X Unspecified cars running in group but not eligible for awards, points or podium PX 6X Note 3: Post 2016 cars may run but will not be eligible for points or podium (HSR Five Year Rule) *Prototypes without series limits and restrictors may be up-classed or rejected from entry.

Grp 7 Class Historic / Post-Historic Sports Racing Cars (slicks) Enduro Special Can-Am / USRRC / FIA Gr 6 / A, B, C Sports Racer / CA1 Classic Can-Am/ASR, pre 1974, (over 6.5L): McLaren M20; M8; Shadow DN4; Lola T163; T222, T260, T310, etc. H1 CA2 Classic Can-Am/ASR, pre 1974, (under 6.5L): McKee, McLaren M6, M12; , T160; , 610; , 917, etc. H1 CA3 Can-Am/ASR; post 1974, (2.0 - 5.0L): , T333, 430, T530; RT2; Prophet; Frisbee; March; Chevron B54; Schkee, etc. H1 H/PT FIA Gr 6, Championship For Makes Coupes thru '74: Lola T70 MkIII; GT40; Ferrari 330, 512; , etc. H2 USRRC Early Can-Am, USRRC (treaded tires): Lola T70; McLaren M1; Genie; McKee; /40, etc. GTC1 V/PT FIA Championship of Makes Prototypes thru '74 (treaded tires): GT40; Lola Mk IIIb; Porsche 908/910/917; Mirage, etc. GTC1 HSR 2021 RACE / ENDURO CLASSES (updated 1/8/21)

H/BSR Historic B Sports Racers/World Sportscars (under 2.0L): Chevron B19/21/23/36; Lola T212/292; ; Toj, etc. H3 H/CSR Historic C/D Sports Racers (under 1.8L): LeGrand; Kohler; Ocelot, etc. H4 S2/A Sports 2000 (later) post ~ '85: Lola; Carbir; Pratt-Miller; Diemen; Swift DB5, etc. H4 S2/B Sports 2000 (early) thru ~ '85: March; Swift DB2; Royale; Shrike; Tiga, etc. H4 7X Unspecified cars running in group but not eligible for awards, points or podium HX

Grp 8 Class American Stock Cars, NASCAR, etc. Enduro Special See Note 4 SC/A Modern Era (post-2006); Nextel/Sprint/Nationwide NE SC/B Modern Era (1996-2006); Nextel/Sprint/Nationwide/CoT; SC/A cars running "limited" specifications. NE SC/C Winston/Busch Cup Era (1980-1995) NE See Note 4 SC/D American Stock Cars built under local series rules using alternate body panels (i.e. GRP), Nascar Trucks, etc. NE SC/E1 Grand National Era; thru 1979 (disc brakes) NE SC/E2 Grand National Era; thru 1979 (drum brakes) NE SC/E HSR "Legacy" stock cars: (Pre-existing HSR stock cars built beyond series specifications) NE 8X Note 4: Post 2016 cars may run but will not be eligible for points or podium (HSR Five Year Rule) NE

Grp 9 Class Historic / Modern Era - GTS / GT1 / GT2 / GT3 LM-D / TransAm Enduro Special Trans-Am / SCCA GT1/2 / FIA GT1/2/3 See Note 5 GT1/A IMSA/FIA/SCCA: GTLM, GT1/GTS1/GTLM/TA1; '08 ~ '16: BMW E92; Corvette C6 ZR1; Porsche 997 RSR; ; Viper GTS-R, etc. GTM1 GGTA GT1/B IMSA/FIA/SCCA: GT1/GTS1; '98 ~ '07: AM DBR9; /575; Corvette C5/6-R; Maserati MC12; Viper GTS-R; S7-R, etc. GTM1 GGTD GTS1 IMSA/FIA/SCCA/Trans-Am/ GTO/GT1/GTS1; '85 ~ '97: GTR-1; Porsche GT1; Corvette; Camaro; Mustang; Merkur; Capri, etc. H5 GGTD See Note 5 GT2/A IMSA/FIA/GrandAm: GTD, GT2/GTE/TA2; '04 ~ '16: Ford GT; Camaro GT-R, Corvette C6-R, Panoz Esperante; Ferrari 430/458; Spyker, etc. GTM2 GGTB GT2/B IMSA/FIA: GT2; '99 thru ~ '04: Corvette C5-R; Viper; Porsche GT2, etc. GTM3 GGTE GT3 IMSA/FIA GT3; '06 ~ '14: Viper GTS; Porsche 997 RSR; 991.1 RS/RSR; BMW M3; Aston Martin; Ferrari 430/458, etc. GTM3 GGTC See Note 5 GT3 World Challenge GT3 Cup/Challenge, etc.; '06 ~ '16: 991.1 Cup; Ferrari 430/458 Challenge, etc. GTM3 GGTC IMSA GT ~ 1975 - 1984 AAGT FIA Gr 5/IMSA '75 - '84 GTX (Turbocharged), AAGT (All-American GT): ; GM Monza, Camaro, Corvette, etc. H5 GTO FIA Gr 4/IMSA/Trans-Am '75 ~ '84, GTO over 3.0L: Porsche 911, 914, 934; Camaro, Corvette; , etc. H6 *Current Pro/Am Racing Entries (Post 2016) See Note 5 9X *Current Trans-Am TA1/TA2, SCCA GT1, post '16: Corvette; Camaro; Mustang; Dodge, etc. GTMX See Note 5 9X *Current GT LM/D/E, GT3/TA3 post '16: Porsche 991.2/992 Cup/RS/RSR, Huracan, Ferrari 488, Corvette C7-R, Ford GT, Audi R8, BMW M6 GTMX 9X Other unspecified cars running in group but not eligible for awards, points or podium GTMX Note 5: Post 2016 cars may run but will not be eligible for points or podium (HSR Five Year Rule) *Listed cars are for example only; several models are eligible in more than one class based on rule restrictions and specifications, etc. See Note 5 UNL *Unlimited GT Specials (accepted by application) NE

Grp 10 Class Modern Era GTS2 / GT3 / GT3 Cup / GT4 / Production Challenge Series Enduro Special GTS2 IMSA GTS2/FIA GT2; '85 ~ '98: Porsche 911/964/993 RS/RSR, etc. H6 GGTE GT3/A GT3A: Porsche 996 R/RS/RSR; 996/997.2 Cup (3.8); Corvette C5-R; Ferrari 360GTC; GTE; Ginetta G55, etc. GTM4 GGTF GT3/B GT3B: Porsche 993 R/RS/RSR; 996/997.1 Cup (3.6); Ferrari 360Ch; Ginetta G50, etc. GTM5 GGTG GT3/C GT3C: Porsche 993 Cup; Cayman-S (3.4); BMW M3/E46 (3.4L); Viper (gen I/II); V6 Cup, Exige-S; Ferrari 348/355; Panoz GTS, etc. GTM6 GGTH See Note 6 GT4 Modern FIA GT4: Cayman GT4; Lotus 2-11, Evora; Ginetta 5; BMW M3/GT4; Camaro GT4; Ford GT4, etc. GTM4 GGTI GT5 GT5: Porsche 964 Cup; Boxster (2.7/3.2); Ferrari 348/355; Panoz GTS, Panoz RA/WC; BMW M3/E36 (3.2), etc. GTM6 GGTJ ST/A Street Tuner A: Street Stock cars with limited modification including aero enhancements by application and individual acceptance GTM5 GGTJ 10X Other unspecified cars running in group but not eligible for awards, points or podium GTMX Note 6: Post 2016 cars may run but will not be eligible for points or podium (HSR Five Year Rule)

Grp 11 Class Modern Era Track Day Cars / Sports Racers Enduro Special See Note 7 MSR/1 Modern Sports Racers (over 2.0L): Radical; Lola; Caterham; Praga, Swift, KTM X-Bow, etc. P6 See Note 7 MSR/2 Modern Sports Racers (under 2.0L): Radical; Shelby CanAm; Stohr; Noble; Ultima; Barras; Wolf, etc H3 11X Note 7: Post 2016 cars may run but will not be eligible for points or podium (HSR Five Year Rule) PX/HX