B-Sedan Challenge Rules


Sponsored by SVRA


This series is designed to celebrate the history of small-bore Sedans, the popularity of these cars was born in one of the greatest series in racing history, Trans-Am!


This will be a nationwide series with multiple regions culminating at the National Championship at COTA at the end of the year, each region will have champions crowned based on points, these awards will be given out at the awards banquet Saturday night at COTA. The B-Sedan Challenge National Championship winners will be crowned on Sunday, there will be a podium for 1st, 2nd and 3rd in finishing order and 1st, 2nd and 3rd overall series points Champions.


Our goal is to provide a series of close competitive racing for Small Bore Sedans that competed from January 1966 to October 1979 in Trans-Am, SCCA B-Sedan and IMSA RS. Due to the time period of eligibility and the numerous rule upgrades and speed enhancements that occurred over the years from the original SCCA 2.5 Challenge, to B-sedan’s final years, adjustments have been made by the officials of the B-Sedan Challenge series to make all of the vehicles entered as competitive as possible, while adhering to the spirit of vintage racing, in the hope of maintaining large competitive fields of cars. The goal is to have close racing among all makes and models.



The B-Sedan Challenge Series is open to all cars from the 1966 to 1979 B-Sedan Trans Am series under both the SCCA and IMSA format. Two classes of cars will compete: Traditional B-sedan cars, and an underclass; B-Sedan Lite, The wording "2.5" was and is in place to open the series up to specific cars like FORD which have 2.3 liters motors as stock equipment. This was and is not to allow cars in the 2.0 liter and under categories to build larger motors (with some rare exceptions to be competitive) with the weight of the car corresponding to the nominal displacement of the motor, this is meant to equalize the field. For the complete original rules and a list of all eligible cars refer to the 1972-1979 SCCA GCR’s.





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All rules in this document supersede the original set of rules where applied. For any odd engine or car specifications please contact the National Director for approval.


All vehicles are required to display the official B-Sedan Challenge windshield banner at the top of the windshield to be eligible for points. Each Region will have a different regional logo in the left corner of the windshield banner. Series sponsor stickers may be required.



All cars will be weighed with driver exiting the track. Add 185lbs for driver weight to your specific cars minimum weight for the total minimum weight. Example; your cars minimum weight is 1800lbs, add 185 for driver weight for a total official weight of 1985lbs exiting the track. If you weigh more than 185lbs you may take weight out of your car if your total weight is more than your official minimum weight. Likewise if you weigh less than 185lbs you may need to add weight to your car to meet the official minimum weight.


Director/s may weigh any cars at any time. Failure to comply with weigh-ins will result in disqualification of position and loss of session points and will start at the back of the field for the next session. Official event scales will be declared at the beginning of the weekend. The weight is the weight, there is no margin of error. The event scales are the final decision for weigh-ins.


Weights of cars not listed may be determined via written requests to the National Director.



Weight penalties may be assessed for minor car spec infractions.


All B-Sedan & B-Sedan Light cars must be kept neat and clean at all times. Period paint schemes are encouraged as well as period advertising. A separate Presidents award will be given annually by the SVRA president for the car and team that most exemplifies the spirit of the B/S series. This will include hospitality of the team to fans and other drivers, paddock presentation & professionalism.














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B-Sedan Challange Series Compitition & Conduct


The Regional Competition Director/s at any time during a season may use competition adjustments to even the field as he sees fit, these adjustments will carry over to the B-Sedan Challenge Championship weekend.


If a car is prepped beyond the spirit of any rule(s) the car may be disqualified at any time. All cars should be prepared and driven with the spirit of Vintage Racing in mind. All drivers must maintain respect for regional director/s, event officials and their fellow competitors on and off the track at all times. We are here to have fun first and foremost.



Any car infractions or un-sportsman like conduct on or off track during the course of the season shall be dealt with by the regional director/s and or national director. Points may be deducted at director/s discretion.









B-Sedan & B-Sedan Lite Points System.


B-Sedan & B-sedan Lite will maintain separate overall point standings for purposes of the Season Points Championship.



Points will be awarded for finishing positions, 2 Races per weekend as follows.


1st = 11 points


2nd = 10 points


3rd = 9 points


4th = 8 points


5th = 7 points


6th = 6 points


7th = 5 points


8th = 4 points


9th = 3 points


10th = 2 points


11th + 1 point





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Points for Qualifying sessions; Points will be awarded for laps completed (rain or shine) in 2 Qualifying sessions per weekend, 1 point per lap will be awarded based on laps completed as shown on the official event timing and scoring sheets, 8 laps maximum, If actual total Qualifying session laps are more or less than 8 a formula will be applied to equal the maximum 8 laps.


Example, a Qualifying session for whatever reason only has 6 laps; 8/6=1.333 points per lap. If you completed 4 of the 6 laps 4X1.333=5.333 points will be awarded. If a Qualifying session is called by the event directors (not regional directors) because of inclement weather all cars will receive 8 points. If a Race is called for the same reasons, points will be awarded for the best times in the previous qualifying session or, finishing position of the previous race.



The final regional race at COTA will be held on Saturday and will be a standard point’s race, it will count as the last regional race for all regions. The National Championship will be decided on Sunday and will be a double point’s race.


Tie Breaker rule will be decided in order as follows:


1.   Race Starts (Saturdays Qualifying Race is considered a race)


2.   Race Laps Completed


3.   Average of all Race Finishing Positions


4.   Qualifying session points


NOTE: Drivers with any violation of any B/S Challenge prep rules, or being found underweight anytime during the season shall NOT be eligible for any tie breaker rule



Drivers may attend events outside their local region for regional points as long as these events are supported by the B/S Challenge Series. (Please see the B/S Challenge schedule)


Any competitors that choose to race nationally instead of regionally may score national championship points at approved events but these points will not count toward a regional championship. This choice must be approved by the National Director prior to your first point’s race.











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A maximum of 4 events will be scored including 1 out of region event. Competitors may score regional points at the first out of region event attended only. After a 5th race in or out of region the lowest scoring weekend event points will be dropped for the maximum number of 4 event weekends. Any official B/S Series events after the first five are not eligible for scoring points.




COTA will be the 5th point’s event for all regions and will include 2 Qualifying sessions and the Saturday’s race. The points scored at this event may not be dropped. The B-sedan Championship race on Sunday and will be double points.



All Drivers are responsible for emailing their highlighted, official, weekend time sheets / results to the National Director in order to score points.


Local regions are determined by the state in which you reside.


Registration and Certification



All cars must complete the registration process for the B-Sedan Challenge in order to be eligible for points.


·        Fill out the online Certifications and Competition Passport forms


·        Upload the required pictures



Once the Forms are complete the official weight will be assigned and the Competition Passport application will be locked. Any modifications or changes in car specs during the year must be updated via email with documentation and pictures, a new weight may be issued where applicable.


All cars will have their Official Competition Passport posted on the SVRA Website for public viewing. All cars on the Website are considered to be in good standing with the B/S Challenge; once a car has been withdrawn or disqualified it will be removed from the website.


The B-Sedan Challenge Series will be featured in the 2018 VRQ Magazines and will post point standings as well as photos and some driver bios.


Competition Passports must accompany all cars at all events.




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All approved cars will receive a:


·        Competition Passport


·        TABS 2.5 Challenge Logbook.


·        2018 Tabs Dash Plaque


·        2.5 series Roll Bar Tag stamped with the Competition Passport number


·        Official series Windshield Banner


·        Official displacement and weight stickers


·        Any required series sponsor stickers


·        2.5 Challenge Hero Cards


·        1 year subscription to VRQ Magazine



In an effort to grow the sport of Vintage Racing SVRA will absorb all costs associated with the B/S series as to not place any burden on any not for profit racing organizations or the competitors themselves. We simply ask that drivers commit to running at least 3 events.




Rules B Sedan




Engines must be naturally aspirated and the same size and manufacture that was available within this 2.5 Challenge Series specific time period. Engine sizes that did not exist on or before October 31, 1979 or at the end of the production of a specific make and model, whichever came first will not be allowed, except where allowed in these rules. Bore and Stroke must be as manufactured,


1.2mm (.047) maximum overbore allowed. Any odd engine configurations may be allowed on an individual basis with competition adjustments and must be approved by the National Director.




















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Open Engine Inspections: All entrants must be prepared to prove bore and stroke to the Competition Director at any given event. Declining an inspection will result in automatic disqualification of the event and all seasonal points up to this time forfeited. Please be prepared with the proper tools, gaskets and equipment to remove the head if necessary.





Engines must be able to run on 112 Octane Race Gas or less. Track fuel must be used at the B-Sedan Challenge Championship weekend and will be checked. Dry Sumps may be approved on an individual basis, a weight penalty may be assessed if approved.




The following items are prohibited.


·        Any performance enhancing Fuel Additives


·        Add on ignition management systems. (user controlled spark advance or retard systems)


·        Traction Control of any type


·        Crank trigger ignitions


·        Remote Canister Shocks and or struts of any type


·        Remotely adjustable shocks & struts


·        Motorcycle or watercraft carburetors





Flywheels, Clutch’s and Starters are open, Starter must be mounted in the original position, IE; forward mount / reverse mount.






Stock case synchromesh transmissions 4 or 5 speeds are acceptable.


Reverse must be fully functioning.











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Dog Ring transmissions in a stock case with recognized factory ratios are allowed with no weight penalty. (Must have documentation for ratios and are subject to scrutiny). Gearboxes such as Jerico, G-Force, Saenz, Hewland, & Quaife etc. will be penalized 75 LBS, ratios are free. Reverse must be fully functioning in either case.





BMW allowed alternate transmissions with no weight penalty:


Getrag 240 / 4 speed

Getrag 242 / 4 speed standard


Getrag 242 / 4 speed close ratio

Getrag 242 / 5 speed sport transmission

Getrag 245 / 5 speed o/d


Getrag 265 / 5 speed sports transmission Getrag 245/10 5 speed direct drive transmission

ZF Direct Drive 1= 2.30 / 2 = 1.56 / 3 = 1.28 / 4 = 1.088 / 5 = 1.00


Getrag Gears are free, must be in factory case (BMW or Getrag) transmission.




Datsun allowed alternate transmissions with no weight penalty:



All Z car, 200SX or Truck (Stock/Syncro) 4 or 5 speed overdrive transmissions.


Nissan Competition Direct Drive Transmissions: 32010-N3220, option 1- 1st 2.818, 2nd 1.973, 3rd 1.470, 4th 1.192, 5th 1.00 32010-N3221, option 2- 1st 2.348, 2nd 1.601, 3rd 1.296, 4th 1.138, 5th 1.00 32010-N3222, option 3- 1st 2.192, 2nd 1.601, 3rd 1.470, 4th 1.138, 5th 1.00 32010-N3201, option 4- 1st 3.321, 2nd 2.270, 3 rd 1.601, 4th 1.240, 5th 1.00 Optional Nissan Competition 1st gears (1.813, 1.832, 1.858 and 1.97) are allowed on any Factory transmission.


Optional Nissan Competition Webster Input Reduction Gear allowed on any Factory transmission.








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United Kingdom Elite Transmission Gear sets in a Nissan A or B case


Option 1 – 1st 2.823, 2nd 1.976, 3rd 1.479, 4th 1.200, 5th 1.00

Option 2 – 1st 2.348, 2nd 1.601, 3rd 1.296, 4th 1.200, 5th 1.00


Nissan Competition early “A” Transmission with 3 piece case:



Option 1 – 1st 2.678, 2nd 1.704, 3rd 1.262, 4th 1.00, 5th .852

Option 2 – 1st 1.858, 2nd 1.388, 3rd 1.217, 4th 1.00, 5th .852


Option 3 – 1st 2.554, 2nd 1.758, 3rd 1.271, 4th 1.00, 5th .852


Nissan original equipment (standard)

1st 2.957, 2nd 1.858, 3rd 1.311, 4th 1.00, 5th .852




3.0-1 FRONT:


Front Suspension and steering type must use the original suspension pieces. Relocation of pick up points is allowed within reason for the purposes of roll center, bump steer, and suspension travel.


3.0-2 REAR:


Rear Suspension type must be based on the original suspension of vehicle: Semi Trailing Arm rear suspensions are not to be replaced with true I.R.S, Semi Trailing Arm, or Solid Axle systems and vice versa.



Exception: F.I.A group 2 / B-Sedan prepped race vehicles that came stock with leaf spring rear suspensions are allowed to upgrade for safety and performance reasons to a Truck Arm, 3-link, 4-Link, or Modified 4-Link (lotus link) , with a cross link, traditional watts, fixed watts, Mumford link, panhard bar, or J-bar, or any combination thereof. Sprung links of any type are not allowed. Aluminum or Titanium solid rear axle tubes are not allowed. Quick Change center housings are not allowed.















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NOTE: All live solid axle cars spring and shock assemblies can be of a coil over type, or weight jack spring buckets with a separate shock location. When utilizing a coil over for an upgrade on a solid axle system, the stock shock location on the chassis must be utilized for that assembly. The mechanical advantage, or “motion ratio” of the shock location may not be improved over the stock location. Floater type rear axles are allowed. Any non-factory specifications must be documented in the cars Competition Passport.





Under trays are not allowed to extend under the car beyond the opening of the front wheel arches and may not be lower than the original bodywork. Skid Plates are allowed under the oil pan but must serve no other purpose.


3.0-4 SWAY BARS:


Sway Bars diameter and material and method of attachment are open. Cockpit adjustable Sway Bars are prohibited.



B-Sedan Minimum weight requirement (car only) is ONE pound per nominal


C.C.   IE; 1800cc = 1,800 lbs, 2000cc = 2,000 lbs, 2300cc = 2,300 lbs. (See Competition Adjustment rules for weight adjustments per car model below).






Maximum wheel width of 7” x 13", 14" & 15” Wheel diameters appropriate to the make and model are required. Brake cooling fans are not allowed. Brake Ducting is allowed within the confines of approved front end bodywork, core supports, air dams and spoilers. Cars with 14” wheels may go up or down 1” on diameter. All Datsuns must use 13” wheels.



5.0-1 TIRES:


The event organizers tire rules must be followed. Tires for the B-Sedan Championship at COTA will use the SVRA Group 8 Tire Rules.




In the event of rain for any timed qualifying session or race, the regional spec tire may be used with rain grooves or any DOT tire (the spec size) with a tread wear of 100 or greater. In the event of rain the Competition Director will make an official declaration of a “Rain Session” 60 minutes prior to the start of the session.





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Only period brake configurations are acceptable, 10.5” maximum front rotor size, add 50lb to any car that has disc brakes on rear that originally came with drum brakes. Any out of spec brake systems will carry a 25lb per corner weight penalty and will have until January 1st 2019 to backdate their brakes.


Box Flare, Alpina or FIA body kits may be approved on an individual basis.






ALFA and BMW 2000cc: Reduction in weight to 1900 LBS


ALFA and BMW 1800cc: Reduction in weight to 1700 LBS


DATSUN 610: L-20B Engine allowed at 2000 LBS


DATSUN 510: L-20B Engine allowed at 2000 LBS


DATSUN: L-20B with FIA head add 75 LBS (penalty)


All Push Rod Engine cars are allowed a reduction of 150 LBS to Minimum weight to CC requirement, with a maximum of a 601CC increase to stock displacement. Bore and Stroke is open within this format for these vehicles to allow more cars to compete. Final engine package is not to exceed 2301CC maximum displacement.



All LOTUS (Twin Cam) MODELS: Reduction in Minimum Weight of 100 LBS.


All FORD (Twin Cam) MODELS: Reduction in Minimum Weight of 100 LBS.


MAZDA RX-2 & RX-3: Min. weight - 2000 LBS, 12A only, venturi size is limited to 44mm for the 48MM 2 BBL Downdraft with Street or Bridge porting.


All VOLVO (OHC) MODELS: Reduction in Minimum Weight of 150 LBS.


All VOLKSWAGEN (OHC) MODELS: Reduction in Minimum Weight of 150 LBS.






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Cars eligible for BSL cutoff at October 1979:


BMW 1600 – 2002, 2000cc single 2 barrel 38MM (1.50") downdraft or 1600cc with two 40MM side‐draft carbs W/ 34mm chokes, weight 2000 LBS.



Datsun 510, 610, 710, 1800cc single 2 barrel downdraft 38 mm (1.50") weight 2000 LBS.


Datsun 610, 710 2000cc 2 Barrel downdraft 38 mm (1.50") Weight 2000 LBS.


Datsun 200SX (1977-1979) 2000cc single 2 Barrel downdraft 38 mm (1.50") weight 2000 LBS.


Datsun 510 1600cc, two side‐draft 45MM carbs with 34mm choke limit weight 2000 LBS.


Ford Cortina up to 1600cc pushrod Two side‐draft 40MM carbs with 34mm choke limit Weight 2000 LBS.


Mini up to 1381cc max, Weight 1400 LBS. Open Carburation


Volvo Sedans 1800cc with 2 barrel 38MM (1.50") downdraft Weight 2000 LBS.



Datsun 1200 /B210 / 210 w/ A12 open induction Weight 1300 LBS


Datsun 1200 / B210 / 210 w/ A14 Two side‐draft 40MM carbs with 34mm choke, Weight 1500 LBS


Datsun 1200 / B210 / 210 w/ A15 two side‐draft 40MM carbs with 34mm choke, Weight 1700 LBS















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1.  A period front spoiler may be mounted below and to the rear of the bumper location. No rear spoilers or wings allowed.


2.  Both front and rear bumpers may be removed.


3.  Small period correct fender flares are allowed (NO “Box or Alpina” flares).


4.  Fiberglass hood and trunk lids are allowed but no other body parts except flares will be allowed in fiberglass. No carbon fiber allowed.


5.  Lexan windshield and Plexiglas side and rear windows are allowed.


6.  No changes to the internal or external coachwork to accommodate installation of the induction system






Wheels, Tires and Suspension:


1.  Wheel rim width 6 inches maximum, wheel diameter, +/- 1” diameter is allowed for cars that have 14” wheels. All Datsun’s must use 13” wheels.


2.  Tires – The event organizers tire rules apply. The B-Sedan Championship will use the SVRA Group 8 tire rules. Same rain tire rules as the BS cars


3.  Track may not change more than ½ inch from stock. Track width is measured from center to center of Tire Contact Patch


4.  Suspension joints; spherical bearings and/or rod ends are allowed for sway bar end links, upper front strut bearings, and pan-hard rod ONLY. All other suspension bushings may be replaced by urethane bushings.


5.  Factory suspension control arms must be used. Reinforcement of suspension control arms for safety is allowed.


6.  Suspension pickup points may not be moved except for minor slotting to adjust camber and toe.


7.  Adjustable camber is allowed.





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8.  Spring perch height may be adjustable.


9.  Quick-change or knock off-wheels are not allowed.


10.  The wheelbase of the automobile may not be changed or relocated.


11.  Suspension type (McPherson strut or coil spring/shock combination) must be as originally provided on vehicle.





Engine Specifications:


1.  Maximum overbore is 1.2mm (.047).


2.  Only pre-1979 model year engine configurations and displacements available for sale in the USA are acceptable. Displacement and engine configuration must be correct for chassis type as sold in the USA.


3.  Cylinder heads must be OE for USA production cars. Porting is allowed. Material may not be added to cylinder heads.


4.  Stroke must be same as stock for engine used.


5.  No dry sump lubrication allowed unless originally factory equipped.


6.  No electrically driven water pumps.


7.  Charging system, either alternator or generator, must be intact and functioning.


8.  Any distributor may be used so long as no engine modifications are required. Any ignition may be used and must be triggered by the distributor.


9.  Valve springs, keepers, and retainers are free. No alteration of the valve centerlines allowed. Titanium valves are prohibited. Valve diameter must be stock.


10.  Roller cam followers are not allowed unless stock for production cars


11.  Carburetors must be type and number per eligibility list.





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12.   2 barrel downdraft carbs are limited to a maximum barrel size of 38mm. Example; Weber 38DGV. Dellorto 38MM 2BBL/ Holley 1.50/38MM 2 BBL


13.  Side draft carburetors are limited to maximum choke (venturi) of 34mm and maximum barrel (body) size of 40mm. Example; Weber 40DCOE or Mikuni PHH with 34mm chokes.





1.  Limited slip or locked differentials are allowed. Original OEM case is required.


2.  Brake and clutch pedals and hydraulic cylinders are free.


3.  Transmissions may have a maximum of 5 forward speeds and functioning reverse. Transmissions must have OE case and internals (synchromesh).

Sequential gearboxes and “dog” boxes are prohibited.


4.  Stock type diameter flywheel, pressure plate and clutch disc are required. Clutch and pressure plate must be single disc design.


5.  Radiators are free but must be in approximately stock location.


6.  Engine and/or transmission must be in stock location and may not be repositioned to alter weight distribution.


7.  Rotary engines are not allowed.





1.  Brake discs, calipers and/or drums must be period correct.


2.  Substitution of dual master cylinders and pressure adjusting devices are allowed.


3.  Replacement or removal of brake booster systems is allowed.


4.  Any car using rear disc brakes that came with drum brakes will incur a 50lb penalty.


5.  Brake disc diameter 10.5” maximum.




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1- Northwest Region:


Director/s: Jim Froula




·        Oregon


·        Washington


·        Idaho



2 - Southwest Region:


Director/s: Steve Link, Matt Rose




·        California


·        Nevada


·        Arizona



3 - Big Sky Region:






·        Montana


·        North Dakota


·        South Dakota


·        Wyoming


·         Nebraska




4 - Mid Central Region:






·        Utah


·        Colorado


·        Kansas











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5 - Longhorn Region:


Director/s: Steve Smargiasso




·        New Mexico


·        Oklahoma


·        Texas


·        Arkansas


·        Louisiana



6 - Central region:


Director/s: Steve Bonk




·        Minnesota


·        Iowa


·        Missouri


·        Wisconsin


·        Illinois


·        Michigan


·        Indiana


·         Ohio


































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7 - Northeast Region:


Director/s: Chris Zappa




·        Kentucky


·        Virginia


·        West Virginia


·        Maryland


·        Delaware


·        Pennsylvania


·        New Jersey


·        Rhode Island


·        Connecticut


·        Massachusetts


·        New York


·        Vermont


·        New Hampshire


·        Maine




8 - Southeast Region:


Director/s: Brian Walsh




·        Mississippi


·        Alabama


·        Tennessee


·        Georgia


·        Florida


·        South Carolina


·        North Carolina



















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Official Races by Region

(Schedule is not complete at this time)


1 - Northwest Region:



1.   Pacific Raceways, April 27-29 (SOVREN)


2.   Sonoma, May 31-June 3 (SVRA)


3.   Pacific Raceways June 29-July 1 (SOVREN)


4.   Portland, July 26-29 (SVRA)


5.   Pacific Raceways, September 22-23 (SOVREN)



2 - Southwest Region:


1.   Willow Springs, March 24-25 (VARA)


2.   Autoclub Speedway, April 27-29 (SVRA)


3.   Sonoma, May 31-June 3 (SVRA)


4.   Buttonwillow, October 6-7 (VARA)


5.   ?



3 - Big Sky Region:


Any official TABS 2.5 Challenge Race in any region will count for Big Sky Regional points




4 - Mid Central:


None at this time



5 - Longhorn Region:


1.   Motorsports Ranch, February 23-25 (CVAR)


2.   Hallet, April 13-14 (CVAR)


3.   Strada Corsa Houston, May 4-6


4.   MSR Cresson, June 1-3 (CVAR)


5.   Hallet, August 24-26 (CVAR)








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6 - Central Region


1.   Road America, May 17-20 (SVRA)


2.   Indy, June 13-17 (SVRA)


3.   Mid Ohio, June 21-24 (SVRA)


4.   Gratten, August 17-19 (VSCDA)


5.   Road America, September 14-16 (VSCDA)




7 - Northeast Region


1.   Summit Point,??-?? (VRG)


2.   Indy, June 13-17 (SVRA)


3.   PittRace, July 6-8


4.   Watkins Glen, September 5-9 (SVRA)


5.   VIR, September 20-23 (SVRA)


8 - Southeast Region


1.   Roebling Road, Feb 16-18 (SVRA)


2.   Sebring, March, 1-4 (SVRA)


3.   Road Atlanta March 28-31 (SVRA)


4.   Indy, June 13-17 (SVRA)


5.   Roebling Road, September ??-?? (VDCA)