I edited the BSW Pure stock rules a bit to more of a Pro 4 style, Let me know what you like or what could be changed. Yes its long too. I would also like to know how many people would like to run this class...seriously not just maybe.

2008 Pro Stock 4 Division Rules (Possible)

1. BODY STYLE
Open to 4-cylinder cars, engines no larger than 2500cc. Cars may be front or rear wheel drive. No mid or rear engine cars. Must have a stock wheelbase as factory listed for that model/year. Racecars must be complete and presentable in appearance at the beginning of each race. No convertibles or open roofs allowed. All holes to be covered with minimum 20 gauge steel.
2. BODY APPEARANCE
Body must be stock appearing. All chrome moldings, ornaments, door handles, glass or plastic components must be removed except grille, windshield and stock dash. Original rear wheel arches must be retained. Inner trunk panels, hood panels and roof panels must remain stock. (NO GUTTING) No aluminum body panels. Inner door panels may be removed. Tin Spoiler may be used maximum 5". If door skins or fenders are replaced with body they must be stock appearing. Racecars participating in racing events must be presentable in appearance at all times. Cars that are considered improperly prepared may be rejected by the Technical Committee at any event. Racecars must be complete at the beginning of each event. Any cars considered unsafe to driver, competitors, staff or fans will be rejected and not allowed on track. Cars may not be shortened or lengthened in any way.
4. BRAKES
four-wheel hydraulic brakes in good working condition are compulsory and are subject to test and inspection. Pedal must be in original position. Four wheel disc brakes are allowed. Drilled and Slotted rotors are allowed.
5. BUMPERS
Bumpers are required. They must be secure and are subject to test. Bumpers must be welded and chained to prevent bumpers from falling off onto the race surface and creating a hazardous condition during a race meet. Homemade bumpers are subject to approval and must be covered with stock bumper covers or aftermarket plastic bumper covers. Ends must be turned in. Sharp edges must be removed or covered. Bumpers must be present and secure at the start of each hear or feature. All cars must be equipped with chains or cables, front and rear, strong enough to be lifted by a tow truck for towing purposes. These must be attached to the chassis and not the bumpers.
6. CARBURETION/FUEL INJECTION
Carburetors are open to any 1bbl or 2bbl setup, or factory dual 1bbls. Throttle must have two return springs. May use open element filter.Ram air tubes are allowed, or cold air box. No turbos, blowers or NOS. Fuel injected cars must have a kill switch, marked in red, which shuts off power to the fuel pump. Fuel injected cars must also have a relay, which shuts off power to the fuel pump on low oil pressure or loss of ignition.
7. CHASSIS & SUSPENSIONS
Suspension Open, aftermarket struts,shocks,springs allowed.. No devices to raise or lower cars. Adjustable sway bars allowed. Frame must be minumum 4" ride height.Camber is open in Right front and Left front wheels. No rear camber.
8. DOORS
Must be welded or bolted securely. Doors may be cut down.
9. DRIVELINE
Must have steel 360 degree retaining hoop 1/4” by 2” positioned at front and rear of the drive shaft within 6” of each U-joint. (Rear wheel drive only). No chains. Drive shafts must be painted white.
10. ENGINE
Must be stock for make, model and year. Maximum engine size is 2500cc. No rotary or multi-cam motors allowed. Maximum 3 valves per cylinder. Cams are open to any Lift or Duration. Intake manifold may be port matched and polished, exhaust manifold may be port matched. Maximum overbore .040”. Engine mounts may be made solid. Engines without safety mounts must have a safety chain mounted from engine to frame in case an engine mount breaks.
11. EXHAUST
Must exit under floor and behind driver and exit out right or left side of car. Maximum 2 1/2” O.D. pipes. Single exhaust only. Mufflers are mandatory.
12. FIRE CONTROL
Cars must have an approved fire extinguisher mounted in an approved mounting bracket and within driver’s reach with seat belt fastened. Fire extinguisher must have gauge and if the extinguisher is older than three years it must have a recharge slip dated within one year. SFI approved firesuit is mandatory. Stock hood and trunk latches must be removed and replaced with quick entry holddowns.
13. FIREWALLS & FLOOR
Original front and rear firewalls must be retained. Floors may be tinned. All holes must be covered with minimum 22 gauge sheet metal either welded or riveted in place. No metal screw allowed.
14. FRAME
On Uni-body cars, front and rear frame sections may be joined for added strength. No X frame supports.
15. FUEL
Cars may use street legal unleaded pump gas with no additives allowed or you may use the racing fuel available from Barrie Speedway with no additives allowed. Cars may be disqualified if they are caught using any fuel or additives that make their fuel any stronger than the fuel available at Barrie Speedway. No NOS allowed.
16. FUEL PUMP SYSTEM
Stock fuel system for that car make, model and year.
17. FUEL TANK
Must be securely mounted in trunk compartment between the frame rails and no lower than rear axle. Hatchback models require a latching, accessible compartment/firewall to be constructed of minimum 22-gauge steel, to house fuel tank. Trunk floor may be removed. Any size fuel cell allowed. Neoprene or steel gas line must be securely fastened under floor. On fuel injected cars, fuel line must run in protected or in a steel conduit. No plastic or glass fuel filters. No copper lines. Fuel cell mandatory. Fuel must not leak from tank if car is turned. Gas caps must seal and vent lines must have a check valve.
18. IGNITION
Stock distributor or stock electronic ignition allowed. Aftermarket Coil packs allowed. No MSD ignitions. Charging and starting system optional. Two ignition kill switches must be painted red on both ends of dash.
19. INTERIOR
All flammable material must be removed except driver’s seat and stock dash. (Dash optional). racing seat must be used and securely mounted. Seat must be positioned completely to the left of the centerline of the car. Aluminum racing seats are highly mandatory. A solid headrest is mandatory and is subject to test.
20. PAINT & LETTERING
All cars must be neatly and brightly painted. Numbers assigned by the track must be painted legibly on both sides of car and on roof in min. 18” high and 2” wide numbers in a colour offering distinct contrast to the colour of the car. No trick numbers. All cars must have their numbers in white (min. 3” high) on upper right hand corner of the windshield for lineup purposes. All cars must have 3” high white number/letters on the lower side on windshield indicating the size of the engine within 1cc. Example: 2210cc.
21. RADIATOR
Must be in stock location and include a one-gallon overflow can mounted ahead of engine firewall. Radiator must fit under hood.Aluminum Racing radiators allowed. No antifreeze allowed.Radiator fans are open. All antifreeze must be flushed out thoroughly. There will be a three (3) week’s suspension if antifreeze is found.
22. REAR ENDS
Welded stock rear ends allowed.Mini spools allowed.  Must be in stock location and. Suspension mounts may be customized
23. ROLL BARS/CAGE
Full roll cage with minimum 4 door bars on driver’s side and 3 door bars on passenger’s side are mandatory. A minimum of two uprights is required between each door bar. Main cage must be constructed of minimum 1 3/4” O.D. wall tubing. Door bars and door bar uprights must be a minimum of 1 1/2” O.D. .095” wall tubing. Uni-body cars must have a one square foot by 3/16” plate under the uprights or the uprights must be attached to the sub frame. Uni-body cars must have a bar running horizontally between the rear uprights at floor level. If a front or back hoop is used, it must be installed in such a way as to ensure it will not entrap or injure the driver if it moves Minimum 3” clearance recommended between driver’s helmet and overhead roll bars. All bars in driver’s area must be properly padded with an energy absorbing material. All welds must be electric or Mig welded. All main cage joints must have minimum .125” thick gussets. If door bars are less than 1 3/4” O.D. tubing then all joints require gussets. No pipefittings allowed. No heating of tubing to form bends. Scrub rails are not counted as door bars. If scrub rails are used they must be securely mounted and have no sharp or protruding edges. Maximum 1” x 2” welded or bolted to the roll cage. Mounts must be within 6” of front and rear scrub rail. Carriage bolts only on scrub rails. Scrub rail must be mounted at or above front and rear wheel centerline. If bolts are countersunk, maximum 1” hole size. Front and Rear hoops mandatory
24. RACING BELTS/HARNESS
Racing belts/harness are mandatory. Minimum 5 point harness with one lap belt and two shoulder belts. Must be in good condition. Shoulder belts must be securely mounted to the roll cage. Lap belts must be securely mounted to the frame, stock mounts or cage mounts. Subbelt may be mounted to floor using minimum 3” washers to prevent pull through. All bolt mounts must be double nutted. Ensure that belts are not pinched when mounting them.
25. SAFETY HELMET
An approved racing safety helmet must be worn in all practice and race events and until car is parked in pits. Snell 95 (minimum) is mandatory. Snell 2000 SA or newer is highly recommended. Goggles and full face helmets are highly recommended.
26. FIRESUIT
Mandatory SFI approved firesuit, gloves, boots & neck brace are highly recommended.
27. TIRES
Tires are open to any make, size, and rating. Hoosier racing tires are optional. No mixing of tire sizes allowed. Example: If running 13”, all four wheels must be 13".

28. TRANSMISSION
Stock OEM automatic or manual transmission for that make. Transmissions must bolt in with stock mounts. Automatics may be modified. Standards may be mildly modified.Standard transmissions must have 1/4” thick scatter-shield over the top 180 degrees of the bell housing for protection. No transmission coolers in driver’s compartment.
29. WHEELS
Right front rim must be a racing wheel. 4 racing wheels are suggested
30. WINDSHIELD & WINDOWS
All windows must be removed except full front windshield. Windshield must be stock windshield or Lexan. If Lexan is used, two center braces must be installed. If the windshield moulding is removed, four windshield retaining clips must be installed. Driver’s window net with quick release is compulsory. Absolutely NO Plexiglas allowed. Lexan is not Plexiglas.
31. WEIGHT
Cars must not have more than 55% of total weight of car on left side wheels including driver. Weight must be minimum one pound for each cc of engine plus 100 lbs, including the driver. No topping up of fuel after race or prior to weighing. All ballast weights must be painted white, securely bolted on with minimum two bolts and the assigned car number on the weight. Barrie Speedway reserves the right to add any amount of lead to any location on any car deemed to be too fast in order to keep this class competitive and fun. This will be enforced only by the tech official.
32. WHEEL CLEARANCE
Trimming of fenders will be allowed if neat and there are no sharp edges. Excessive trimming is not allowed.
FINAL NOTE
All specifications and regulations contained herein are subject to immediate change – without prior notice – as determined by the Director of Operations.