CLASS RULES AND REGULATIONS

 

Jr. Pro Stock is a heads-up class designed for naturally aspirated small block and big block engines. Small block engines have a maximum engine size of 470 inches. Big block engines have a maximum engine size of 650 inches. With no major engine limitations. Power adders of any kind i.e. Nitrous, Turbochargers, Superchargers, etc… are strictly prohibited. All entries have a minimum wheelbase of 96 inches and must compete on a bias-ply racing slick.

 

Note: This set of class rules is presented to all competitors under the assumption that any modifications not specifically written within these rules shall be deemed illegal, unless the competitor has the expressed written consent from the Jr. Pro Stock Tech Director.

 

 

RACING FORMAT

This class will be an all run heads-up field, NHRA Pro Style Ladder on a .400 Pro Tree.

Jr. Pro Stock will feature an 8 car minimum field*

 

In an effort to provide participants with confidence of competition, only participants who have fully completed the entry process including all required entry fees will be added to the field and featured on the Jr. Pro Stock Contenders List at streetcarsupernationals.com.

 

*In the event that if by November 1st 7 or fewer cars have entered, the Jr Pro Stock class race will be cancelled and entry fees fully refunded. However, no refunds will be allowed before November 1st or in the event the 8 car minimum field requirement has been met.

 

SMALL BLOCK BASE WEIGHT (max cubic inch 470)

320 = 2387 + Over 320 add 2.85 lbs. per cubic inch (inline valve head motors only)

340 = 2444 + Over 340 add 2.80 lbs. per cubic inch (inline valve head motors only)

360 = 2500 + Over 360 add 2.75 lbs. per cubic inch

380 = 2555 + Over 380 add 2.70 lbs. per cubic inch

400 = 2609 + Over 400 add 2.65 lbs. per cubic inch

420 = 2662 + Over 420 add 2.60 lbs. per cubic inch

440 = 2714 + Over 440 add 2.55 lbs. per cubic inch

460 = 2765 + Over 460 add 2.50 lbs. per cubic inch

470 = 2815

 

BIG BLOCK BASE WEIGHT (max cubic inch 640)

440 = 2860 + Over 440 add 2.60 lbs. per cubic inch

460 = 2900 + Over 460 add 2.55 lbs. per cubic inch

480 = 2940 + Over 480 add 2.50 lbs. per cubic inch

500 = 2990 + Over 500 add 2.45 lbs. per cubic inch

520 = 3039 + Over 520 add 2.40 lbs. per cubic inch

540 = 3086 + Over 540 add 2.35 lbs. per cubic inch

560 = 3133 + Over 560 add 2.25 lbs. per cubic inch

580 = 3178 + Over 580 add 2.10 lbs. per cubic inch

600 = 3220 + Over 600 add 2.00 lbs. per cubic inch

620 = 3260 + Over 600 add 1.80 lbs. per cubic inch

640 = 3296

 

Big Block entries > 640 cubic inches must add a 4lb per cubic inch weight penalty to the 640 cubic inch base weight.

 

WEIGHT ADDITIONS/DEDUCTIONS

Dry sump oiling systems must add 5% of engine size in pounds.

Spread bore small and big blocks must add 5% of engine size in pounds.

Second carburetor or throttle body must add 10% of engine size in pounds.

Manual Transmission must add 10% of engine size in pounds.

Pontiac, Buick, Olds, and AMC engines may deduct 175lbs.

Mopar big block wedge engines may deduct 125lbs.

Four-link rear suspension must add 5% of engine size in pounds.

 

Non-class origin tire with automatic transmissions must add 15% of engine size in pounds.

Non-class origin tire with manual transmission must add 25% of engine size in pounds.

 

Body Style Weight Breaks: Tier 1: Deduct 25 lbs., Tier 2: Deduct 50 lbs., Tier 3: Deduct 75 lbs.

See body style weight break table below for body style assigned tier. If your vehicle is not listed you must run at base + c.i. weight

 

How to figure your weight: Weight additions for the above categories are based on taking the engine cubic inch and multiply it by the indicated percentage and converting that number to pounds. IE: 1969 Chevrolet Camaro with 520 cubic inch engine with an automatic transmission (base of 3039). Utilizing category 2 heads add 15% = 78 lbs., dry sump oiling system add 5% = 26 lbs., and non-class origin tires add 15% = 78 lbs., tier 1 body style deduct 25 lbs. for a total add of 157 lbs. (78 + 26 + 78 – 25 = 157) and a total car weight of 3196

 

REQUIREMENTS & SPECIFICATIONS

 

REQUIREMENTS & SPECIFICATIONS

ENGINE: 1

 

BLOCK

Any aftermarket cast iron or cast aluminum block is permitted. Billet blocks are prohibited.

 

HARMONIC BALANCER

SFI Spec 18.1 balancer is required.

 

ENGINE MOUNTS & LOCATION

Engine/motor plates and mid-plates are permitted. Engine block and cylinder heads cannot be in contact with the firewall.

 

 

ENGINE COATINGS

The use of engine coatings is permitted.

CRANKSHAFT

Any aftermarket crankshafts are permitted.

 

CONNECTING RODS

Any aftermarket connecting rods are permitted.

 

PISTONS & PINS

 Any aftermarket pistons and pins are permitted.

 

PISTONS RINGS

Any aftermarket piston rings are permitted.

 

CAMSHAFT DRIVE SYSTEM

Any camshaft drive system is permitted.

 

CAMSHAFT

Any camshaft is permitted.

 

LIFTERS/LASH ADJUSTERS

Any lifters/lash adjusters permitted.

 

CYLINDER HEADS

Any aftermarket cast iron or aluminum cylinder heads are permitted. Cylinder heads must be overhead valve, two valves per cylinder maximum, and single spark plug per cylinder design. BILLET HEADS ARE PROHIBITED. Mopar OEM or aftermarket Hemi heads run same as Chevy or Ford. All Pro Stock style cylinder heads no matter what year produced are Category 3 regardless of brand and are not available for an OEM manufacturer weight break. Pontiac, Buick, Olds, AMC and Mopar cylinder heads must maintain the factory OEM port layout in order to receive a base weight deduction.

 

Small Block Engines:

• Category 1 heads: run at base weight.

-Under 360 c.i. must add 15% of engine size in pounds

• Category 2 heads: add 15% of engine size in pounds.

-Under 360 c.i. must add 25% of engine size in pounds

• Category 3 heads: add 25% of engine size in pounds.

 

Small Block Heads: (see weight add section)

• Category 1: Inline valve heads measuring 1.000 or less bottom of intake port to deck.

• Category 2: Inline valve heads measuring 1.001 + bottom of intake port to deck.

• Category 3: All non-inline valve heads. (canted and splayed valve)

 

Big Block Engines:

• Category 1 heads: run at base weight.

-Under 480 c.i. must add 10% of engine size in pounds

• Category 2 heads: add 20% of engine size in pounds.

-Under 480 c.i. must add 30% of engine size in pounds

• Category 3 heads: add 25% of engine size in pounds.

-Under 480 c.i. must add 35% of engine size in pounds

 

Big Block Ford & Chevy Heads: (see weight add section)

• Category 1: Heads measuring 1.000 or less bottom of intake port to deck.

• Category 2: Heads measuring 1.001 / 2.000 bottom of intake port to deck.

• Category 3: Heads measuring 2.001 + bottom of intake port to deck.

 

Note: All cylinder head intake port measurements will be measured after all work has been completed and in ‘’race’’ form.

The lowering of intake runner height to circumvent the port height weight penalties is prohibited.

 

 

INTAKE MANIFOLD

Any intake manifold permitted.

 

OILING SYSTEM

Any oiling system, vacuum pump and oil pan permitted.

 

COOLING SYSTEM

Any cooling system permitted.

 

EXHAUST SYSTEM

Any exhaust system permitted. All exhaust systems must be directed out of body and away from driver and fuel tank.

 

FUEL SYSTEM

Any electronic, mechanical or belt driven fuel pumps are allowed. Electronic fuel pumps must shut off with the master electric cut-off switch. Fuel cell must have a pressure cap and be vented to the outside of the body. Front mounted fuel cells must meet SFI Spec 28.1 and be mounted between the frame rails or enclosed in a round tube frame. A round tube frame must be constructed of a minimum of 1 ¼-inch O.D. x .065-inch chrome moly tubing. Artificial cooling or heating of fuel (i.e., cool cans, ice, Freon, etc.) prohibited.  Circulating systems that are not part of the normal fuel pump system are prohibited.

 

EFI SYSTEM

Any aftermarket electronic or mechanical fuel injection may be used. Fuel injector size and or type are unlimited.

 

THROTTLE BODY

Any aftermarket throttle body/bodies permitted. Maximum of two throttle bodies permitted. Throttle bodies that do not mount to a conventional 4150/4500 flange (adapters prohibited) must run dual carburetor weight adder.

 

CARBURETOR

Any aftermarket carburetor permitted. Split or inline style carburetors prohibited. Carburetors that do not mount to a conventional 4150/4500 flange (adapters prohibited) must run dual carburetor weight adder.

 

THROTTLE LINKAGE

Throttle control must be operated by the driver’s foot.

 

FUEL

Jr. Pro Stock specified VP Racing Fuels gasoline is the only acceptable fuel allowed. The Jr. Pro Stock Tech Director reserves the right to check gasoline at any time during competition. Failure to pass fuel check is grounds for disallowance of the run during competition and disqualification from the event during eliminations.

 

DRIVETRAIN: 2

 

CLUTCH, FLWHEEL & FLYWHEEL SHIELD

Flywheel and clutch meeting SFI Spec 1.2, 1.3, 1.4, or 1.5 is mandatory. Flywheel shield meeting SFI Spec 6.2 or 6.3 is mandatory. Clutch must be manually operated by the driver’s foot. Electronics, pneumatics, hydraulics, or any other device may in no way affect the clutch system. The throw-out bearing must release all fingers, levers, stages, etc. simultaneously. Staged or variable release clutches are prohibited.

 

MANUAL TRANSMISSION

OEM or aftermarket transmissions with a maximum of 5 forward speeds permitted. Clutchless models permitted. Pneumatic, electric, hydraulic, etc. shifters permitted.

 

AUTOMATIC TRANSMISSION

Any OEM or aftermarket automatic transmission is permitted. Any torque convertor is permitted. Trans-brakes are permitted. Pneumatic, electric, hydraulic, etc. shifters are permitted.

 

DRIVELINE

Any steel, aluminum or carbon fiber driveshaft meeting SFI 43.1 spec is permitted.

 

REAREND

Any automotive type rear-end is permitted.

 

BRAKES, STEERING & SUSPENSION: 3

 

BRAKES

Automated brakes are prohibited. The application and release of the brakes must be a function of the driver. Four wheel hydraulic disc brakes are mandatory. Steel brake lines are mandatory. Brake lines must be out of flywheel and driveline areas. Line-lock is permitted only on the front wheels. One line-lock solenoid with one button is permitted. Any other

electrical, pneumatic, hydraulic, etc. switch in braking system is prohibited. Master cylinder must be mounted above the lower frame rails.

 

STEERING

Any automotive type steering system permitted. If competitor is using a commercially available quick disconnect steering wheel, it is mandatory that it meet SFI Spec 42.1.

 

SHOCKS/STRUTS

Coil over shocks are permitted front and rear. Shocks must be stand-alone and may not be adjustable during run via electronic and/or other means. Electronic programmable shocks prohibited. Each vehicle must be equipped with one operating shock for each sprung wheel.

 

FRONT SUSPENSION

Aftermarket front K-members are permitted. Aftermarket “bolt-in’’ style control arm front end kits can be used as a direct replacement for all American production vehicles where the shock is attached to the upper control arm (from the factory) is permitted without a weight penalty. (Ex. ’62 -‘67 Chevy Nova & ’60 -‘65 Ford Falcon) Modifying the shock/strut tower is permitted.

 

REAR SUSPENSION

Stock type, ladder bar and 4-link style suspensions are permitted.

 

WHEELIE BARS

Wheelie bars are permitted with a maximum length of 80 inches.

 

CHASSIS

Stock, unaltered frame rails required in front sub frame from suspension mounting points rearward, frame rails and sub frames forward of the suspension mounting points maybe modified. Sub frames on uni-bodied cars may be joined under car. After market or custom designed (square or round tubing) rear frame rails permitted from the frame kick up point, after market frame rails forward of the kick up point may be tied into the stock floor pan. Mini-tubs are permitted.

 

WHEELBASE

Entries must retain stock wheelbase dimensions of + or – 1 inch.

 

GROUND CLEARANCE

A minimum of 3 inches from the front of the vehicle to 12 inches behind front spindle centerline is mandatory. A minimum of 2 inches for the rest of the vehicle is mandatory (except for oil pan and exhaust headers).

 

 

TIRES & WHEELS: 5

 

TIRES

Any size bias-ply drag racing slick permitted, radial tires are prohibited. Tire tread may not extend outside of the fender.

Class Origin Tire - a true 10.5 racing slick – defined as: bias-ply racing slick with a maximum of 30.5 inches tall, maximum tread width of 10.75 inches as measured on the rim AND as advertised by the tire manufacturer.

 

WHEELS

Aftermarket racing wheels permitted.

 

UPHOLSTERY

Factory appearing type dash is mandatory. Carpeting is required from seats forward. Factory door panels or door panels made of aluminum or carbon fiber are required. Aftermarket steering column is permitted. Aftermarket pedals are permitted.

 

WINDOW NET

Window net meeting SFI Spec 27.1 is mandatory.

 

 

BODY: 7

 

BODY

All vehicles must maintain OEM appearances for their specific year, make, and model being used. All entries are required to have the OEM body shell intact from the firewall to the taillight panel. Lightweight body parts are restricted to the following: hood, fenders, bumpers, doors, and trunk-lid/deck-lid. Hood, trunk-lid/deck-lid, and doors must be hinged or be lift off models. Alterations or aerodynamic modifications are prohibited.

 

HOOD SCOOPS

Forward facing and factory OEM hood scoops are permitted.

 

GRILLE

All entries are required to have an OEM type grille. Covering in front of or behind the grille is permitted and must maintain a ‘’professional appearance’’.

 

FIREWALL

A non OEM firewall will be allowed provided it is in the stock location and must be one piece of at least .024 or greater steel material fully attached in a in stock location.

 

FENDER SPLASH PANS

Fender splash pans may be altered.

 

WINDSHIELD & WINDOWS

All entries are permitted to use Lexan windows.

 

FLOOR

Driver’s side floor pan must be steel and welded into place. The remainder of the floor section can be .024 inch steel or .032 inch aluminum. The use of magnesium is prohibited. Transmission tunnel may be removable and must be made of either .024 inch thick steel or .032 inch thick aluminum.

 

WHEEL WELLS

All entries all permitted to use steel, aluminum, or carbon fiber wheel tubs.

 

WING/SPOILERS

All entries are permitted to use rear wing/spoilers. Wing/spoilers are allowed a maximum length of 26 inches. Any adjustments to the wing/spoiler during a run are prohibited.

 

STREET EQUIPMENT

OEM headlights and taillights for year/make/model of vehicle being used must be intact and operational.

 

APPEARANCE

All cars in competition must be painted or wrapped. Advertising graphics are permitted on the body. Class & Competition Numbers: Numbers must be easily visible/legible and located on the front, back, and both side windows.

 

BATTERY

A maximum of two batteries is allowed.

 

IGNITION

Any battery operated ignition system and distributor drive system is permitted.

 

STARTER

All entries must be self-starting with an on-board starter.

 

MASTER CUTOFF SWITCH

A master cutoff switch is mandatory.

 

 

SUPPORT GROUP: 9

 

COMPUTER/DATA RECORDERS

Computer/data recorders are permitted and must standalone and to be only used for information gathering purposes.

 

BRACKET RACING AIDS

The use of any bracket racings aids such as optical sensors, delay boxes, shutter boxes, throttle stops, etc. are prohibited. The use of any device (electrical or mechanical) that allows a driver to ascertain the position of their vehicle to the starting line is prohibited.

 

TRACTION CONTROL

Any device used for the specific purpose of traction control, (Davis Technologies, Racetronics boxes) i.e. control devices that limits the amount of wheel spin to desired amount, devices that maintain a front/rear wheel speed relationship, or any other device that attempts a traction control function other than customary traction control practices such as adjustments in timing, launch rpm, is very strictly prohibited. Jr. Pro Stock Tech director has full discretion to ascertain if the use of a traction control device has been implemented. Any person found in possession of a deemed illegal traction control device will be subject to immediately disqualification and forfeiture of any paid in entry fees.

 

PRESSURIZED BOTTLES

A maximum of one pressurized container (excluding nitrous and fresh air systems) per vehicle is permitted. All pressurized bottles must meet D.O.T. 1800lb minimum specification.

 

TOW VEHICLES

The use of tow vehicles is permitted.

 

CREW MEMBERS

Each crew member must have the proper starting line credentials and must were matching attire.

 

 

DRIVER: 10

 

DRIVER

The driver when in the vehicle, from the ready line until the vehicle is safely stopped on the return road, is required to have all safety restraint systems (including the helmet) on and be securely fastened in the vehicle at all times

 

CRENDENTIALS

A Valid state or government issued driver’s license beyond a learner/s permit level is mandatory for cars running 10.00 or slower. A valid NHRA competition license is mandatory for cars running 9.99 or quicker, at a NHRA Member Track. A valid NHRA or an IHRA competition license is mandatory at an IHRA Member Track.

 

Note: It is ultimately the competitor’s responsibility to familiarize themselves with the PSCA class requirements as well as all NHRA safety requirements. The competitor agrees they bear the ultimate responsibility when it comes to safety and how it complies with the PSCA and NHRA rule books. The competitor also agrees that no one else other than the competitor is in the best position to know about how their particular race car has been constructed and how to safely operate.

 

 

Body style weight break table

 

TIER 1

Body Type                                                    Years

 

GM F Body                                                   67-79

GM G Body                                                   78-89

Chevy II / Nova                                             62-67

Dodge Valiant                                               59-62

Ford Maverick / Mercury Comet                   70-77

Lancer                                                          61-62

Plymouth Barracuda                                    64-69

Corvette                                                       68-82

 

TIER 2

 Body Type                                                   Years

 

 Dodge E Body                                             70-74

 GM A Body                                                  68-77

 Ford Mustang                                              64-73

 Mercury Cougar                                          67-70

 Chrysler A Body                                          63-76

 Nova                                                           68-79

 Cutlass                                                        61-63

 

TIER 3

Body Type                                                    Years

 

Chevrolet Bel Air                                          55-58

Ford Falcon / Mercury Comet                      64-65

Chrysler B Body                                           66-75

GM B Body                                                   58-76

GM A Body                                                   64-67

Ford Fairlane                                                62-69

Ford Torino / Mercury Montego                     68-74