Group 4

Group 4 Representatives

Have a question about the cars in this group? Contact the Group 4 Representatives:


  • C-Modified (CM)
  • VA
  • VB
  • VC
  • FF-JR
  • F-JR
  • Spec Sprite
  • SFP
  • VCS
  • G4T
    • Touring 1 (T1)
    • Touring 2 (T2)

Corinthian Classic: (Group 4)

Production Cars

  1. Must have full interior with 2 seats, carpet (if originally installed) and door panels (not aluminum panels). Headliner may be removed for roll bar clearance. Seats, gauges, etc. may be substituted but not removed. Stock dash required but can be modified for instruments.
  2. Wheels may be 1.5” wider than stock width as listed in the 1972 SCCA PCS or in manufacturer’s data. Cars with 16” standard wheels may substitute 15” wheels.
  3. Wheels must be of period appearance (modern copies OK) or points will be deducted. No Revolutions or 3-piece wheels.
  4. Tires must be treaded and of at least 60-series tall.
  5. No body modifications allowed for tire clearance except rolling inside lip of fender. No light weight body panels unless homologated. Bumpers may be removed and windscreens used in place of windshields. No air dams or other aerodynamic devices allowed.
  6. Gearbox must have original number of speeds and conform to 1972 or earlier SCCA PCS.
  7. Brakes must of original type and size. Example: No disc brakes on 356 Porsche.
  8. Carburetors must be of original manufacturer and number. Internal engine/gearbox parts are restricted to 1972 SCCA GCR and PCS regulations.
  9. Roll bars and all safety equipment required. Fuel cells recommended. No points penalty for any safety equipment including roll cages in closed cars. However, cages should not extend through firewalls or bulkheads to tie in to suspension points. No roll cages in open cars.
  10. Cars may be lowered; springs substituted and sway bars added. Shocks may be replaced, but changing system (i.e. lever to tube) will result in loss of authenticity points or relocation to other classes.
  11. Cars of approved model but not built in 1961 or earlier are allowed so long as they maintain 1961 appearance and mechanical configuration.
  12. No replicas allowed (i.e. kit cars of modern manufacture).
  13. No racing history is required for any car.
  14. Cars outside the spirit of the regulations may be reassigned to other CVAR race groups by Authenticity Committee.
  15. All body panels must be original material.
  16. All trim components and overall appearance should be visually similar to 1950s practice.


  1. Must be in a period configuration and use period technology (1950’s) and parts.
  2. Treaded tires required of 60-series or taller. 6” maximum wheel width. Wheels should be of period appearance (modern copies like Panasport, American Torque-Thrust, Halibrand, etc. OK). No 3-piece wheels allowed.
  3. Brakes must be of period availability (no Wilwood, vented rotors, etc.). Disc brakes may be substituted for drums only if fitted to at least one similar car prior to 1962. Proof is responsibility of driver. Any drum brake may be substituted for any other drum brake (including Alfin drums). Alternate period calipers may be used in place of Halibrand spot brakes.
  4. The following cars are specifically NOT allowed in Group 4: Lotus 19, Elva Mk.6, Cooper Monaco. They run in BSR, Group 6 or CSR, Group 6 depending on engine.
  5. Period sports-racers may be replicated using only period parts (including an original, non-repro production car frame). Owner must furnish documentation on car replicated. Example: Devin-Healey or Triumph, etc.


Please submit cars not listed for classification. Cars with non-SCCA approved modifications may be reassigned to another class or group. Classes will be broken down farther as participation levels increase.

C Modified:

Chevrolet Corvette 1962 327” engine. SCCA correct induction and drum brakes.
Ferrari 250 SWB coupe and California
Aston Martin DB-4 series
Jaguar XK-150 with disc brakes and/or 3.8.
Modifieds over 2000cc.


Chevrolet Corvette V-8 to 1961. 283 engine/SCCA correct induction and drum brakes.
Ferrari (all over-2 liter street models exc. SWB) to 1961
Mercedes 300SL
Jaguar XK-120/140/150. Drum brakes and 3.4 only.
Jaguar Mk.I and II sedans to 1961. 3.4 or 3.8 liter.
Porsche 356 Carrera 1(drum brake)
BMW 507
Maserati 3500GT to 1961
Allard K and P series with V-8
Ford Thunderbird 1955-57
Woodill Wildfire and Glasspar
Austin-Healey 100/6 with Webers
Austin-Healey 100-S
Modifieds up to 2000cc.


Allard Palm Beach with 4 or 6-cylinder engines
Aston-Martin DB-2 series
Daimler SP-250 (all)
Morgan +4 with Triumph and Standard engines
Nash Healey
Morgan 4/4 with 1340cc engine
AC Ace and Aceca with AC or Bristol engines
AH 100/4, 100/6 and 3000 (SU carbs)
Porsche 356, A and B. 1500 and 1600 (drum brakes)
Frazer-Nash 2-liter models
Ginetta G-4 with 997cc 105E only.
Healey Silverstone
Swallow Doretti
Alfa Romeo 2000 to 1961
OSCA street models
Jensen 541
Lancia Aurelia
Triumph TR-2, TR-3 and TR-3B
Maserati 1500 and 2000 street models
Lotus Super Seven to 1961 with 1340cc Ford 109E engine only. No crossflow or 1500cc. Lotus 7A with BMC 950 or Ford 997
Corvette 6-cylinder models 1953-55
Ferrari two-liter street models
MGA and twin cam (all including Mk.II)
Elva Courier Mk.I to III with MGA engines
TVR Grantura with Climax or MGA engines
Mercedes 190SL
Fiat 1500S


Alfa Romeo 1300 models to 1961
Morgan 4/4 flat rad with Climax or 1267cc Standard engine
Morgan Trikes
Sprinzel Sprite
Turner 950S (drum brakes)
Fiat 1200
Fiat and Fiat-Abarth (all street models)
Renault Alpine to 1961 (drum brake)
Lotus Elite
AH Sprite (Bugeye only). 948cc with disc or drum front brakes. SU carbs. Morris Minor 948cc.
Crosley SS and Hot Shot
Denzel 1300
Porsche 356 1100 cc and 1300cc
Fairthorpe Electron
MG T-Series (std. or blown)
HRG (all)
Lancia Appia
Morgan 4/4 with 997cc Ford 105E or side-valve 100E engines
Dyna Panhard and all DB models
GM: 850cc to 1100 cc
HM: Up to 850 cc
Pre-WWII sports and race cars on period tires


Front-engined F-Jr.
F-III with motorcycle engines.


FJ1- front engine with drum brakes.
FJ2- rear engine with drum brakes.
FJ2a- rear engine with drum brakes and Hewland QC gear box.
FJ3- FJ with disc brakes.

Spec Sprite (BoD – December 2010):


  1. Any 1958 to 1974 Sprite, Midget or Austin Healey Mark I (Bugeye)
  2. Interior trim may be removed, door panels and dash must remain, but may be covered or “skinned”.
  3. Door glass and roll-up mechanism may be removed.
  4. Windshield may be cut down.
  5. Battery to be located in original factory location and heater box maybe removed.
  6. Minimum weight is 1478 pounds with a 5% tolerance as per the GCR.


  1. 1275 cc A-series engine with a 276 Kent cam.
  2. Over bore limited to the 1972 GCR of 0.047”. Engines currently in use will be grandfathered until replacement or rebuild.
  3. Pistons to be stock dished pistons. Part number 21251
  4. Head may have hardened seats and valves but must otherwise be stock.
  5. Engine internals may be balanced.
  6. Adjustable timing chain may be used.


  1. Stock differential must be used with final drive ratio of 4.22:1.
  2. Clutch must be stock
  3. Flywheel must be stock but may be lightened.
  4. Transmission must be stock rib case.


  1. Aftermarket swaybars may be used with any type of bushings.
  2. Ride height may be lowered by cutting front springs and lowering block at the rear. Springs must be stock but may be re-arched.
  3. Shocks may be changed.
  4. Panhard bar may be used with any type of bushings.
  5. Suspension points must remain in stock location.


  1. Brake rotors and calipers must be stock.
  2. Competition pads may be substituted.
  3. Braided steel flex lines may be used.
  4. Late type brake system including Mark I may be retrofitted.


  1. Headers may be used in place of stock manifold.


  1. Wheels must be 13” diameter by 5” wide.
  2. After market “Mags” are acceptable.


  1. Any DOT that meets current CVAR Production car standards.

Fuel System

  1. Fuel cell required.
  2. Placement of fuel cell in or under the trunk is allowed.
  3. Carburetor must be stock HS2, but needles may be richened.
  4. Any air filter may be use, Velocity stacks are acceptable.

Cooling System

  1. Stock radiator or aftermarket aluminum radiator must be used, early cars may retro fit to any late model type cross flow system.
  2. Stock fan must be in place.

Charging / Ignition System

  1. Distributor must be stock with stock points
  2. Engines must have a working alternator or generator


Touring 1 (T1) – over 2 liter cars of the 60’s with limited modifications. Approval required.
Touring 2 (T2) – under 2 liter cars of the 60’s with limited modifications. Approval required.

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