NSS Pro Series

NSS Pro Series

Official Rules & Regulations

2027 Season Rulebook — All competitors are required to review and comply with the current rulebook before entering any event.

Table of Contents

1Class Description2Eligible Year Models & Body Styles3Engine Regulations4Drivetrain5Brakes, Suspension & Chassis6Body & Appearance7Electrical & Competition Rules
1

Class Description

  1. 1.1Nostalgia Super Stock is an index-style foot brake only class for the year models, body styles, and engine combinations which accurately represent those cars which raced in the A/FX and Super Stock classes of the '60s and early '70s.
  2. 1.2Certain exceptions in the authenticity of these cars will be allowed, including but not limited to factors concerning safety, equality in performance, availability, and durability.
  3. 1.3Classification will be based on a visual inspection and an e.t. range. No modifications which alter the car from factory stock are permitted unless specifically allowed in these rules or authorized by the rules committee.
  4. 1.4NSS uses a sportsman's tree and ladder. Qualifying order is determined by closest to the index without breaking out. NSS is an all-run field.
  5. 1.5You are allowed class changes prior to the final qualifying run. You MUST NOTIFY THE RACE DIRECTOR and make one qualifying run under the new index.
  6. 1.6Deep staging is NOT allowed in the NSS class.
  7. 1.7Class indexes: AAAA/FX-8.50 | AAA/FX-8.75 | AA/FX-9.00 | A/FX-9.25 | B/FX-9.50 | C/FX-9.75 | A/NSS-10.00 | B/NSS-10.25 | C/NSS-10.50 | D/NSS-10.75 | E/NSS-11.00 | F/NSS-11.25 | G/NSS-11.50 | H/NSS-11.75 | I/NSS-12.00 | J/NSS-12.25 | K/NSS-12.50 | L/NSS-12.75 | M/NSS-13.00
2

Eligible Year Models & Body Styles

  1. 2.1Note: Car must have a Big Block Motor. The following is a list of cars/engines which are allowed to compete in the Nostalgia Super Stock class:
  2. 2.2AMC AMX: 1968–70; 390
  3. 2.3AMC Matador, The Machine: 1968–71; Big Blocks
  4. 2.4AMC SC/Rambler: 1968–1969; 390
  5. 2.5Chevrolet Full Bodied: 1959–64; 348 & 409s, 454, Z11 427
  6. 2.6Chevrolet Full Bodied: 1965–71; 396–454
  7. 2.7Chevrolet Camaro: 1967–72; 396–454
  8. 2.8Chevrolet Chevelle/Monte Carlo: 1964–71; 396–454
  9. 2.9Chevrolet Corvette: 1965–72; 396–454
  10. 2.10Chevrolet Nova: 1968–70; 396
  11. 2.11Pontiac Full Bodied: 1959–67; 389–455
  12. 2.12Pontiac Firebird: 1967–71; 400–455
  13. 2.13Pontiac Parisienne: 1959–64; 348 or 409
  14. 2.14Pontiac Tempest/GTO/Lemans/Grand Prix: 1961–71; 389–455
  15. 2.15Ford Full Bodied: 1959–67; 390–427
  16. 2.16Ford Thunderbolt: 1964; 427
  17. 2.17Ford Mustang: 1967–71; Big Block (FE and 385 series permitted)
  18. 2.18Ford Torino, Fairlane, Montego, Cyclone: 1968–71; Big Block (FE and 385 series permitted)
  19. 2.19Ford Fairlane/Comet/Cyclone/Falcon: 1963–67; 390, 427 (FE and 385 series permitted)
  20. 2.20Mercury Cougar: 1967–71; Big Blocks
  21. 2.21Dodge/Plymouth Full Bodied: 1960–67; 383–440 wedge
  22. 2.22Dodge/Plymouth Full Bodied: 1964–67; Hemi
  23. 2.23Dodge/Plymouth Satellite, Road Runner, Coronet, RT, Super Bee, GTX: 1968–71; Big Block
  24. 2.24Dodge/Plymouth Challenger-Cuda: 1970–71; 383, 426 and 440
  25. 2.25Dodge Charger: 1966–71; 383, 440, Hemi
  26. 2.26Buick Full Bodied (Including Special, Skylark & Grand Sport): 1960–71; 401–455
  27. 2.27Buick Skylark: 1964–67; 400–401–455
  28. 2.28Oldsmobile Full Bodied: 1960–67; 394–400–455
  29. 2.29Oldsmobile Cutlass/442: 1964–71; 400–455
  30. 2.30Dodge Dart/Barracuda: 1967–69; 383–440
  31. 2.31Dodge Dart/Barracuda: 1968; 426 Hemi
3

Engine Regulations

  1. 3.1RADIATOR: OEM production-style or aftermarket radiator is required and must be mounted in stock location. Stock core support is required. Any aftermarket (belt drive or electric drive) water pump permitted. Any cooling fans permitted.
  2. 3.2ENGINE: See Eligible Year Models and Body Styles. Any internal engine modifications permitted.
  3. 3.3EXHAUST: All entries allowed to use tubular headers. Adapter plates permitted to bolt headers to cylinder head. Exhaust must be directed out of car body, away from driver and fuel tank. Any headers and/or collectors permitted.
  4. 3.4FUEL DELIVERY: Fuel cells, electric or mechanical fuel pumps, pressure regulators, and any line size permitted. Fuel pump must shut off with a master electrical switch. Stock gas tank (if used) must be retained in factory location.
  5. 3.5FUEL: Commercially available racing gasoline, pump gasoline, methanol and E85 are the only fuels permitted. Maximum blended volume of alcohol may not exceed 85%. Nitrous oxide is prohibited.
  6. 3.6OIL SYSTEM: Dry-sumps prohibited. Oil pump must remain in stock location. Oil pan capacity may be increased.
  7. 3.7SUPERCHARGER/TURBOCHARGER/AFTERCOOLERS: All prohibited.
  8. 3.8DISTRIBUTOR: Must remain in stock location with cam gear drive. Belt drive distributors permitted.
  9. 3.9BLOCK: Aftermarket blocks may be either cast iron or aluminum if they appear externally to be the same as was originally available on the year/make/model of entry.
  10. 3.10ENGINE LOCATION/MOUNTS: Block and/or heads must not touch stock firewall. Firewall must be in stock location. Engine plates and solid engine mounts permitted.
  11. 3.11HEADS: Aftermarket cylinder heads permitted. May be cast iron or aluminum if they appear externally to be the same as originally available. Any internal cylinder-head modifications permitted.
  12. 3.12CARBURETOR: All entries must be carbureted. Carburetors restricted to: Holley, Edelbrock, Carter, Rochester, Demon, Quick Fuel Technologies. Maximum 1.750 throttle blade (no Dominators). Billet base plate and metering blocks permitted. All NSS combinations permitted dual four carburetor setup.
  13. 3.13FUEL INJECTION: Era-correct mechanical fuel injection permitted in FX classes only.
  14. 3.14INTAKE MANIFOLD: Sheet metal intake prohibited. Manifolds restricted to commercially available cast units. Sheet metal, billet aluminum or composite units permitted in FX.
4

Drivetrain

  1. 4.1CLUTCH: Clutch operation must be manually applied and disengaged with foot during run, without the assist of electric, hydraulic or pneumatic devices. Multi-stage, variable release, or lock-up type of any description is prohibited.
  2. 4.2DRIVESHAFT: Any permitted.
  3. 4.3REAREND: Any automotive type rearend permitted.
  4. 4.4MANUAL TRANSMISSION: OEM or aftermarket transmissions with a maximum of 4 forward speeds permitted. Clutchless transmissions prohibited. All shifts must be made manually without the aid of electric, hydraulic or pneumatic devices. Starting line rev limiters permitted.
  5. 4.5MANUAL TRANSMISSION (F/X Classes): OEM or aftermarket transmissions with a maximum of 5 forward speeds or clutchless transmissions permitted in AAAA/FX, AAA/FX, AA/FX and A/FX classes ONLY. All planetary transmissions including Lenco type prohibited.
  6. 4.6AUTOMATIC TRANSMISSIONS: OEM American transmissions or replicas mandatory. Lock-up transmissions/torque converters permitted. All shifts must be made manually without the aid of electric or pneumatic devices. Transbrake is prohibited in competition and can only be used to engage reverse gear.
5

Brakes, Suspension & Chassis

  1. 5.1BRAKES: The braking system may be upgraded. All cars must have front and rear hydraulic brakes. Automated brakes or any type of traction control is prohibited. Line loc permitted on front wheels only.
  2. 5.2SHOCK ABSORBERS: Each vehicle must be equipped with one operative shock absorber for each sprung wheel. May be either hydraulic or friction type, securely mounted and in good working order.
  3. 5.3STEERING: OEM or aftermarket steering in stock location mandatory.
  4. 5.4FRONT SUSPENSION: Stock front suspension as factory-designed required. Aftermarket direct replacement suspension components including tubular A-arms permitted; overall design and function as factory produced must be retained.
  5. 5.5REAR SUSPENSION: Ladder bar, three/four link, or stock rear suspensions permitted. Wheelie bars permitted.
  6. 5.6CHASSIS: All vehicles must have a chassis that meets SFI guidelines for their respective speed and elapsed time. A valid NHRA serialized chassis sticker is mandatory for any car running 9.99 (6.39 = 1/8 mile) or quicker, or 135 mph or faster at an NHRA member track.
  7. 5.7FRAME: Stock frame required but may be strengthened with the addition of braces and notched or moved inboard for rear-tire and wheel tub clearance.
  8. 5.8GROUND CLEARANCE: Minimum 3 inches from front of vehicle to 12 inches behind centerline of front axle; 2 inches for remainder of vehicle, except oil pan and exhaust headers.
  9. 5.9WHEELBASE (NSS Classes): Must retain stock wheelbase with a maximum variation from left to right and front to back of 1 inch. Stock overhangs are required. FX Classes: Any period-style alteration of wheelbase and overhang is allowed.
  10. 5.10TIRES: Street type or drag slick tires permitted. Maximum rear tire designation of 10.5Wx33-inch permitted. Front tires limited to 4.5-inch minimum tread width and minimum diameter of 26 inches. Tread of tires not allowed to protrude outside the exterior bodyline at the top of the tire.
  11. 5.11WHEELS: Spindle-mount front wheels prohibited.
6

Body & Appearance

  1. 6.1INTERIOR (NSS Classes): Must have full factory seating, upholstery, and carpeting. Aftermarket upholstered bucket seats permitted. Full dashboard mandatory. Rear seat may be removed when roll bar/cage is installed; area must be carpeted or upholstered equivalent to factory specifications.
  2. 6.2INTERIOR (FX Classes): Full removal of interior allowed.
  3. 6.3BODY (NSS Classes): Topless cars prohibited. Lightweight replacement parts permitted for fenders, hood, doors, deck lid, and bumpers. External modifications of any body panel that will alter the stock bodyline is prohibited.
  4. 6.4BODY (FX Classes): Topless cars prohibited. Lightweight replacement parts permitted. External modifications altering the stock bodyline prohibited. Hoods are optional.
  5. 6.5APPEARANCE: All cars in competition must be painted or wrapped. Advertising graphics are permitted on the body.
  6. 6.6SPOILERS/WINGS: Aftermarket wings and/or spoilers prohibited.
  7. 6.7FIREWALLS: Stock firewall in stock location mandatory. Firewall may be relocated rearward; era-correct modifications permitted in FX classes.
  8. 6.8FLOOR/TRUNK PAN: Complete stock floor in stock location mandatory. Modifications permitted for clearance purposes of ladder bars, mufflers, and fuel cell. Material used must be same type and same or greater thickness as original floor/trunk pan.
  9. 6.9HOOD/SCOOP (NSS Classes): Hood scoops limited to OEM equipment or period style. Hood/scoop may be no higher than 5 inches. Pro stock-style scoops prohibited. The entire induction system must be completely covered by hood or scoop. FX Classes: Not required.
  10. 6.10WINDSHIELDS/WINDOWS: Must be OEM safety glass or NHRA/IHRA approved Lexan or Plexiglas.
  11. 6.11BUMPERS: Complete stock-appearing bumpers required.
  12. 6.12FENDER SPLASH PANS (NSS Classes): OEM or aftermarket full-fender splash pans required. May be trimmed to allow clearance for headers. FX Classes: Not required.
  13. 6.13GRILLE: A full-production grille is required for the body style used; era-correct modifications permitted. Covering in front of or behind the grille prohibited.
  14. 6.14WHEEL WELLS: Aftermarket wheel tubs permitted. Leading and trailing edges of fenders may be trimmed for tire clearance, maximum 2 inches.
  15. 6.15RAM AIR: Any aftermarket or fabricated ram-air unit permitted that is not visible from exterior of vehicle.
  16. 6.16DOORS: OEM or aftermarket doors permitted. Driver and passenger doors must be functional and operable from inside and outside of vehicle.
7

Electrical & Competition Rules

  1. 7.1BATTERY: Battery may be relocated. Charging system optional.
  2. 7.2IGNITION: Any battery powered ignition system permitted. All ignition boxes must be listed on the NHRA ET approved ignition box list. MSD Grid 7720 and/or MSD Controller 7730 prohibited. Traction control prohibited. Engine rev limiters (top end only) and/or starting line with manual transmission only permitted.
  3. 7.3STARTER: All entries must be self-starting with on-board starter.
  4. 7.4SUPPORT GROUPS: Bracket racing aids such as optical sensors, delay boxes, stutter boxes, two-steps, and throttle stops prohibited. Manual or electric RPM controlling devices prohibited. Any device that permits the driver to ascertain the position of their vehicle in relation to the starting line is prohibited.
  5. 7.5ONBOARD DIAGNOSTICS/DATA RECORDERS: Wide band oxygen sensors permitted. Playback tachometers permitted. Data recorder allowed. Digital dash display allowed.
  6. 7.6STREET-LEGAL REQUIREMENTS: Headlights and taillights for year and make of body used mandatory; era-correct headlight modifications permitted. Single taillight required to be functional.
  7. 7.7WEIGHT: Weight is not a tech item; however, excessive lightening as determined by the tech officials will not be permitted.
  8. 7.8REPLACEMENT CAR: A driver may replace a car during qualifying with another car. The driver must register, declare an index, and tech the replacement car before the last scheduled qualifying session. No replacement cars will be permitted after the completion of qualifying. No new entries will be permitted after the completion of qualifying.

These rules are effective for the 2026 NSS Pro Series season. NSS Pro Series reserves the right to amend these rules at any time. Competitors will be notified of any changes prior to the next sanctioned event.