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The TA/BS WEST Series’ main objective is to provide a venue of close competitive racing for Small Bore Sports Sedans that competed from 1966 to 1979 with the SCCA B-Sedan and 2.5 Challenge Series. Due to that 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, an adaptation and amalgamation is required by the officials of the TA/BS West series to make all of the vehicles entered as competitive as possible, while adhering to the spirit of vintage racing, and keeping large competitive fields of cars. TA/BS West is taking on the challenge of this task with these supplemental regulations and is achieving the goal of fast and close racing among numerous makes and models. The Series’ intent is to allow (in limited cases) quasi period correct equipment supplementations to allow more opportunity to the membership to build cars by not having to rely on dwindling tribal parts supplies to keep their cars competitive. The Series’ second main objective is to equalize the field where it sees fit annually primarily due to the differential in age, skill level, and car prep levels throughout its membership.


TA/BS WEST is not a sanctioning body, nor a race event organization. It is not a legal entity and has no power whatsoever. Its existence is that of a spirit and gathering of racers who enjoy racing B-Sedan vehicles at Vintage Events held in the Southwestern United States. The Series exists to award spectacular trophies for podium finishes and crown a champion in both classes for its perpetual award known as the Kwech Morton Cup. By engaging in this spirit we are protecting the value of the cars going forward and insuring that our member’s investments are well protected and not out-classed by those who wish to bend or blatantly violate the preparation rules or the spirit of them.


Open to all cars eligible for 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 / 2.5 challenge cars, and an underclass; B-Sedan Light, (Rules for B-Sedan light will be strictly and soley based on the most current version of the V.A.R.A spec sedan, “B-Sedan Lite” prep rules category.) The wording "2.5" was/is in place to open the series up to specific cars like FORD which have 2.3 liters motors as stock equipment. This was/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 now 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. All rules here supersede that original set of rules where applied. 






B-Sedan & B-Sedan Light Points System.


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


1p = 25 points

2p = 23 points

3p = 22 points

4p = 21 points

5p = 20 points

6p =19 points

7p =18 points

8p =17 points

9p =16 points

10p =15 points

11p & under = 12 points


Tie Breaker rule will be decided in order as follows:

1.   Flag Race Starts

2.   Laps Completed

3.   Highest Finishing Positions



All seasonal championship points will be tallied for the season completely with a “Drop 1” rule. The definition of a drop 1 rule is a drivers points are applied from any and all race weekend points accumulated and put towards his seasonal points total but the series will drop the drivers lowest points total from any 1 event and the remaining balance of points will be his seasonal points total. NOTE: Drivers with only one violation of any TA/BS prep rules, or an official series weigh in shall NOT be eligible for any tie breaker rule, and will lose points for the weekend where the infraction occurred.



Engine must be the same size and manufacture that was available for sale to the public within the time period allowed. In other words 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. Special circumstances may be allowed for particular competitive adjustments however on a case by case basis at the discretion of the TABS WEST administration.


SEC 1.0-1

Open Engine Inspections: All entrants must be prepared to prove bore and stroke to the Competition Director at any given event without notice after a race or qualifying session. Failure to comply will result in automatic disqualification of the event and all seasonal points forfeited. Beginning 2017, The series will use an engine pump and or whistler for engines that do not require the removal of cylinder head to achieve the bore and stroke measurement.

(Series officials will also be available to confirm and inspect competitor’s engines prior to final assembly. A log book of engine serial numbers is being held with bore and stroke dimensions. To set up an inspection simply e-mail the Competition Director Tom Neely Tom@anplumbing.com or series Vice President Matt Rose Mattrose2002@yahoo.com)


SEC 1.0-2


Engines must be able to run on 112 Octane Race Gas or less.


SEC 1.0-3

The following Fuel Additives are considered not in the spirit of TA/BS West and will result in heinous competition adjustments being made to your car with very little notice.


Fuel Additive: Propylene Oxide


Fuel Additive: SPO (Synthetic Propylene Oxide)


Fuel Additive: Propylene Glycol


Fuel Additive: Nitro Propane


Fuel Additive: Nitro Methane


Fuel Additive: Pro Cheat Oxygenator


Any Fuel or Lead Additive also not on the list developed in your home lab or by a professional.


SEC 1.0-4

The following items are considered not in the spirit of TABS West and will result in competition adjustments being made to your car with little notice.


Titanium Connecting Rods


Severely Undersized Crank or Rod Journals from stock dimensions


Excessive Compression ratios requiring quasi abnormal ignition systems to manage


Traction Control of any type


Modified Combustion Chambers other than those that result from Cylinder Head shaving.



B-SEDAN O.E.M CASED GEAR BOX UPGRADES: Due to the lack of availability of period correct competition gearboxes and the extreme expense of procuring such original items, the series will allow gear boxes into the series as follows to produce more equal racing and lap times. The goal of TA/BS West is to allow the free market to excel and bring direct drive close ratio gear boxes to the entire field. A weight penalty will not be in effect for O.E.M Cased Gear Boxes with internal upgrades such as gears, bearings, synchros, hubs, sliders, shift forks, and shift rods, or cross model within manufacturer transmission swaps. The definition of an O.E.M Cased Gear Box with upgrades is: A stock O.E.M cased manufacturer specific to the manufacturer of vehicle despite model year, gear box case that has been re-fitted with gears and/or synchros, (servo, or otherwise) that may be similar to that of true dog ring boxes or otherwise, however while still utilizing the stock main shaft, counter shaft, center, end, and nose bearing locations. The main shaft and counter shafts may be upgraded to stronger materials, and design so long as the centerline distance between shafts remains stock. Bell Housings, clutches, & flywheels are unrestricted for the purposes of safety and the ease of allocation. Maximum forward gears is limited to 5.





SEC 2.0-1


Stereotypical Dog Ring boxes such as Jerico, G-Force, Saenz, Hewland, & Quaife etc. will be penalized the standard 75 LBS SVRA penalty.


SEC 2.0-2

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.



SEC 3.0-1 FRONT:

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


SEC 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 reasons to a Truck Arm,  3-link, 4-Link, or Modified 4-Link ( lotus link) , with a cross link, traditional watts, fixed watts, panhard bar, or J-bar. Or any combination thereof.  Sprung links of any type are not allowed. Mumford links are not allowed. Aluminum or Titanium solid rear axle tubes are not allowed. Quick Change center housings are not allowed.

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 without prior written approval from the competition director. Floater type rear axles are allowed as long as each of the original axle lengths is adhered to within +/- of 4.189” maximum.



Remote Canister Nitrogen Charged Shocks are strictly prohibited.

Stealth Canister Nitrogen Shocks are strictly prohibited.

McPherson Canister struts are strictly prohibited.

Cockpit adjustable shocks & struts are strictly prohibited.

Use of the roll cage as an integrated remote shock canister will result in a lifetime ban from TA/BS West



Use of under trays and aero devices will now be scrutinized. Under trays are not allowed to extend under the car beyond the opening of the wheel arches as measured at the bottom of the rocker panel. Skid Plates are allowed under the oil pan but must serve no other purpose.



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



Strictly Prohibited.

B-Sedan Minimum weight requirement without driver at end of session (car only) is ONE pound per declared nominal C.C. IE; 1800cc = 1,800 lbs, 2000cc = 2,000 lbs, 2300cc = 2,300 lbs. (See 2015 Competition Adjustment rules for weight adjustments per car model below) The top five (5) finishing positions will have a mandatory weigh in after every race. The top five (5) qualifiers may to the Comp Directors discretion have a mandatory weigh in after the final qualifying session. Failure to comply with weigh-ins will result in disqualification of position. Qualifying weigh-ins that do not pass inspection will result in a 3 point penalty and a loss of position to the back of the field for the race. Official event scales will be declared at the beginning of the weekend. It is recommended that if you are very near the minimum weight for your vehicle, you should weigh your car prior to the official weigh in on the official event scales to insure accuracy. The event scales are the final decision for weigh-ins. The Comp Director will declare the official set of scales for the event. The series currently employs a 0.5% corrective “fudge factor” only on weigh-ins for inconsistent conditions.




SEC 5.0

Maximum wheel width of 7” x 13", 14" & 15” Wheel diameters appropriate to the make and model are required. Brake cooling fan ducts are not allowed on any wheel. Magnesium wheels are strongly frowned upon. Brake Ducting is allowed within the confines of approved front end bodywork, core supports, air dams and spoilers.


SEC 5.0-1


Effective Jan 1, 2017 TA/BS Failure to comply will result in starting position to the back of the field and loss of points for the season retroactively and for the given event of the violation. For VARA sanctioned events any tire may be used from VARA’s allowed tire list. B-Sedan Light now has a spec tire. Please consult the VARA website for the latest allowable tire. TABS West cars in B-Sedan and B-Sedan light will be allowed use of its VARA approved tire packages for SVRA event at Fontana in 2017


VARA or SVRA Sanctioned event 13” B-Sedan & B-Sedan Light must use a Series 205 / 60 / 13 Tire from VARA’s approved tire list for the class.


VARA or SVRA Sanctioned event 14” B-Sedan & B-Sedan Light must use a Series

205 / 55 / 14 Tire from VARA’s approved tire list for the class.



VARA or SVRA Sanctioned event 15” B-Sedan must use a Series

205 / 50 / 15 Tire from VARA’s approved tire list for the class.



SEC 5.0-2

RAIN TIRES: In the event of a rain event for any timed qualifying session, or race, The Spec tire size or brand for any given event will not be enforced. However the tire must still remain a D.O.T tire that is approved for use by the official sanctioning body of the event. This is to allow drivers to allocate various wheel & tire combinations safe for racing in the rain. In the event of rain the Competition Director will make an official declaration of a “Rain Event” a minimum of 90 minutes prior to the start of the race or timed session.



SEC 6.0

The Series Competition Director at any time during a season may use competitive adjustments to even the field as he sees fit without written notice. If a car is prepped beyond the spirit of any rule(s) the car may be disqualified at any time also without written notice. It is strongly advised that all vehicle entries are prepped in the overall spirit of the T/A 2.5 & B-sedan models through and up to 1979. Box Flare, or Alpina flared cars are allowed on a case by case basis. If you do not understand what the “spirit” is, please contact the Competition Director tom@anplumbing.com for help. We also would like to advise that if you can afford to build something that does not fit the rules of TA/BS West you can afford to un-build the same vehicle. Please do your best to confirm what you are building fits the spirit of TA/BS West rules.



B-SEDAN BMW 2002: Reduction in weight to 1900 LBS


B-SEDAN BMW 1802: Reduction in weight to 1750 LBS.


B-SEDAN (DRIVER TROY ERMISH ONLY) DATSUN L-20 Engine Max Carb Size Dual 44 Mikuni with 39MM Chokes


B-SEDAN (DRIVER TROY ERMISH ONLY) DATSUN L-18 Engine Max Carb Size Dual 44MM Mikuni with 41MM Chokes


B-SEDAN (DRIVER TROY ERMISH ONLY) DATSUN L-16 Engine Max Carb Size Dual 50MM Mikuni with 44MM Chokes



B-SEDAN DATSUN 610: L-20B Engine allowed at 2000 LBS min. weight


B-SEDAN DATSUN 510: L-20B Engine allowed at 2000 LBS min. weight


B-SEDAN: All O.H.V Engine vehicles are allowed a reduction of 150 LBS to Minimum weight to CC requirement, with a maximum of a 401CC 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.


B-SEDAN ALL LOTUS (NON OHV) MODELS: Reduction in Minimum Weight of 100 LBS.


B-SEDAN ALL FORD (NON OHV) MODELS: Reduction in Minimum Weight of 100 LBS.


B-SEDAN FORD CAPRI: Allowed 2.0 Liter with Esslinger M6049-E23A (4 cam tower D port head) with a bore 3.810” and stroke of 2.670”. Maximum Carburetor Venturi is limited to 45mm.


B-SEDAN MAZDA RX-2 & RX-3: (Street or Bridgeport Port 12A only) Min. weight to be adjusted to 2000 LBS with a reduction in Venturi to 44MM for 48MM 2 BBL Downdraft.

B-SEDAN ALL VOLVO (NON OHV) MODELS: Reduction in Minimum Weight of 150 LBS.


B-SEDAN ALL VOLKSWAGEN (NON OHV) MODELS: Reduction in Minimum Weight of 150 LBS.


B-SEDAN (DRIVER TOM NEELY ONLY) Any Car Penalty of 50 LBS added to Minimum Weight of Vehicle


B-SEDAN ABSENCE OF ALTERNATOR: Weight penalty will not be in effect for TA/BS events.


B-SEDAN CRANK TRIGGER IGNITIONS: Crank trigger ignitions of any type are not allowed.


B-SEDAN DRY SUMPS: Due to the fact that Dry Sumps were present prior to 1979 in B-Sedan, they must be allowed. A maximum of 4 stages are allowed. BMW 2002 models only



All vehicles must display the official TA/BS WEST windshield banner at the top of the windshield to be eligible for TA/BS points and trophies. It is the car owner’s responsibility to procure the official banner from TA/BS West. Simply email Tom@anplumbing.com for a banner to be mailed to you. NO EXCEPTIONS TO THIS RULE.



Due to the nature of events that TA/BS West is competing in, it is recommended that all race vehicles in B-Sedan & B-Sedan Light are prepped with aesthetics in mind. Cars should be painted well and numbers displayed in a professional manner. It is in the best interests of the series to enforce this for certain events in such a way to please highly influential race promoters.







BSL (B-Sedan Lite)


Eligible Cars as of 1-1-2017



Cars eligible for BSL cutoff change to October 1979:

BMW 1600/2002 2000cc single 2 barrel 38MM (1.50") downdraft or 1600cc 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) 2000ccsingle 2 Barrel downdraft 38 mm (1.50") Weight 2000 LBS.

Datsun 510 1600cc Two sidedraft 45MM carbs with 34mm choke limit Weight 2000 LBS.

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

Mini up to 1381cc max Weight 1400 LBS. Open Induction

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

Datsun 1200 /B210 / 210 w/ A12open induction Weight 1300 LBS

Datsun 1200 / B210 / 210 w/ A14Two sidedraft 40MM carbs with 34mm choke limit Weight 1500 LBS

Datsun 1200 / B210 / 210 w/ A15two sidedraft 40MM carbs with 34mm choke limit Weight 1700 LBS





1. A 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 not 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


1. Wheel rim width 6 inches maximum, wheel diameter per VARA rules +/- 1” OVER UNDER diameter than stock is allowed


2. Tire rule is max width of 205/60/13 or 205/55/14 See VARA compound requirement for 2017


3.Track may not change more than ½ inch from stock measured on a horizontal plane through the hub centerline. NOTE: This does not mean that an increased track width resulting from an increased wheel offset will result in failing a technical inspection. A maximum allowable Track width as measured from center to center of Tire Contact Patch is pending further research and B.O.D approval for 2017.


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.


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.



1. Maximum overbore is .060” (per VARA standard), subject to the minimum weight regulations listed below.


2. Only pre-1973 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. Crankshaft must be OEM for production cars, but may be modified.


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


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


7. No electrically driven water pumps.


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

9. Any distributor may be used so long as no engine modifications are required. Any ignition may be used except crank fire systems which are not allowed. Ignition must be triggered by a distributor.


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


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


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


13. 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


14. 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.


No motorcycle or watercraft carburetors allowed.




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 specifically forbidden forever till the end of time and then some.


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. No rear discs on cars originally equipped with drums.


5. Brake disc diameter to remain stock.


Minimum Car Weight

Minimum weight will be 2000 lbs at end of session without driver for all cars ( except BMC Mini’s. Minimum weight for the Mini is 1400 pounds.)


 Weights of other cars may be determined as required with written competition requests to the Competition Director.