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General Rules
Plymouth Speedway Rules
Plymouth Speedway General Rules - All Classes
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Super Street Rules
 
All drivers are required to have their own Raceivers for one-way communication with race director official.
Top 5 feature finishers will be required to go to tech area after the race.
 
General
1. Inspections may occur anytime at the discretion of a race official.
2. All cars must be American made passenger cars with a minimum wheelbase of 107”.
3. Engine must match the same manufacturer of the car (chevy to chevy, ford to ford etc).
 
Weight
1. 3000lbs. with driver.
2. No ballast allowed in driver's compartment. All ballast must be painted white with car number and attached to frame or roll cage with a minimum of two, ½" bolts.
 
Frame and Roll Cage
1. Full frames mandatory and must match OEM body and engine (i.e. no ford LTD sub frames being used with chevy engine and/or chevy monte carlo body).
2. No altering of stock frame
3. Rear of frame can be tube chassis from shock mount back.
4. Bracing allowed between the frame rails.
5. Unibody cars will be allowed as long as the front to rear have subconnectors of at least 2x2 steel. Unibody car must meet stock locations for shocks, springs, trailing arm mounts (both on the rearend as well as the chassis). There will be a weight penalty added if Plymouth officials deem your unibody car to be outside the intent of the rules. Please bring ballast with you (weight penalty will be up to 100lbs).
6. 107” minimum wheel base.
7. Rust spots may be repaired.
8. Any repairs to front stub must retain OEM measurements for make and model of car. These repairs are subject to track official approval.
9. Roll cage must be composed of a minimum 1 ½” OD .090 thickness round steel tubing.
10. A four-post roll cage must be installed with minimum 3 door bars on driver’s door. At critical joints in the driver’s door must have gusset plates. Driver’s door must have 1/8” steel plate welded.
11. Minimum 2 bars for passenger side door.
12. Bars may be added from firewall forward to protect frame and radiator.
13. Main roll cage can be braced rearward.
14. Drive shaft hoop is mandatory and must be installed 6-8” behind transmission tail shaft. No chains allowed.
15. Offset cages are not permitted.
16. No bars shall protrude through windshield, windows, or body panels.
17. All four corner posts of the cage must be roof high and connected by a roof hoop. All four corner posts must fasten directly to the frame on the bottom and have braces at dash height both in front of and behind the driver.
18. Minimum 3 bar window screen in front of driver is mandatory. Window screens/mesh mandatory.
19. Window Net with quick-release latch is mandatory on driver’s window.
 
Body
1. Front and Rear Fire Wall in stock location with stock-appearing steel floor pan. No aluminum floor pans allowed. Front and Rear Fire Walls MUST be the same thickness steel as OEM produced. Cars utilizing a motor mid-plate MUST still have a steel firewall with same thickness as OEM produced. Rear firewall MUST not be lower in height than front dash.
2. Interior must be open with no boxing allowed. Aluminum decking will be allowed in the interior where appropriate. The passenger side interior decking will be allowed a 12” maximum length from passenger door panel to edge of interior decking. This is to allow for fuel line to be separated from driver’s compartment.
3. All cars must have complete bodies using original-style body lines as factory produced. NO LATE MODEL LOOKING BODIES or FLAT ROOFS
4. Bodies must match manufacturer make (chevy to chevy, ford to ford, etc.)
5. Body parts can be steel or aluminum.
6. All body panels must be securely fastened or welded at all times. Wire ties or plastic fasteners not permitted.
7. Plastic nose and tail covers allowed as long as they match the make of car.
8. Front and rear bumpers must be safety chained to the frame or hood bar. Each bumper must have a towing chain attached.
9. Hoods and trunks must be securely fastened with a pin-type fastener. Bolts and chains are not allowed to hold down hoods and trunk lids.
10. Fuel cell is mandatory, maximum 22 gallon.
11. 8” spoiler max.
12. Full frame cars (within the rules to the rear shock mount or kickup) with Camaro bodies will be allowed. If it is a unibody car, you will be subject to the unibody rules contained herein.
 
Suspension
1. The following parts must remain stock, in stock location unaltered and OEM for the make and model of the car:
    a. Frames
    b. Hubs
    c. Spindles
    d. Steering Linkage (pitman arm, center link, drag link)
    e. Lower control arms
    f. Ford and Chrysler products must have stock frames for that model and year. (example: strut cars must run struts)
2. Spring adjusters or jack bolts permitted.
3. Steel tubular nonadjustable upper A-arms permitted. Upper a-arms must mount in stock location per the make and model of car.
4. Stock upper ball joints only. No monoball ball joints. No truck ball joints. No adjustable ball joints.
5. Steel tube with heim steering components allowed.
6. Stock steering box only. No rack and pinion.
7. No struts
8. No mono-leaf spring cars. No half leaf spring cars. Stack leaf spring cars both sides only. Adjustable leaf spring sliders NOT allowed. Adjustable leaf spring shackles permitted at rear of tail section. Leaf spring mounts must be in stock location.
9. Aftermarket race springs allowed.
10. Steel racing shocks only. $120 maximum per shock. One shock per wheel.
11. No coil over eliminators.
12. Trailing arms and springs must be in factory or stock position. Bottom trailing arms must be the same length on both sides. Upper trailing arm may be different lengths to obtain pinion angle. No J-bar or panhard bars allowed. No 5th link (pull bar, biscuit bar, etc) allowed.
13. No aluminum suspension parts permitted.
14. No fifth-spring ladder bar, pull bar, lift bar, or energy-absorbing mechanism allowed. Recovery shock on top of rear housing permitted.
 
Brakes
1. Car must have 4 working brakes mandatory.
2. All brake calipers must be steel.
 
Engine
1. No aluminum block
2. No aluminum heads
3. Roller cams allowed
4. Aluminum intake allowed
5. Any gasoline carburetor – 1 only. Up to 1” open plenum carburetor spacer permitted.
6. MSD or similar ignition box allowed. No magnetos or crank triggers. MSD box or similar must be out of reach of driver while belted in the car. Traction control not allowed. If you are caught with traction control, you will not be allowed to return to the track for one year.
7. Motor can be moved back to number 1 spark plug in parallel with upper ball joints.
8. No dry sump. No accusump or partial dry sump systems. Must be complete wet sump system.
 
 
Fuel System
1. Fuel pump in stock location. No electric fuel pumps. No belt-driven fuel pumps.
2. Race gasoline only. No alcohol. No nitrous oxide.
3. Fuel cell mandatory. Maximum 22 gallon capacity. Fuel cell must be mounted in trunk area between frame rails with at least 1 ½” clearance on all four sides. Minimum of two, 12 gauge 1 ½ inch wide safety straps mandatory.
4. 12” inch clearance to the ground required.
 
 
Exhaust
1. Headers allowed.
2. Exhaust exiting behind front tires or within engine compartment must not exceed 100 decibels. It is highly recommended that exhaust run under car and exit behind driver.
3. No exhaust allowed to exit through the hood.
   
 
Battery
1. Battery must be located behind driver’s seat and secured to frame or roll cage in a battery box.
2. A battery disconnect switch/kill switch with clearly marked on/off label is required within reach for safety officials.
 
 
Transmission
1. Stock-style transmission with minimum 2 forward and 1 reverse gear.
2. Automatic or manual transmission permitted.
3. Bert, Brinn, or Falcon-type transmission allowed.
4. Steel driveshaft only
 
 
Rear End
1. No quick-changes.
2. Any OEM stock steel rear housing permitted but must remain in factory or stock position.
3. Floater axles OK.
4. Trailing arms and springs must be in stock locations. Recovery shock on rear housing permitted.
 
Wheels
1. Steel racing wheels 8” maximum only. No aluminum or carbon fiber wheels.
2. 1” lug nuts are mandatory on all 4 wheels
3. Bead locks permitted.
 
Tires
1. Hoosier Emod tire: D, H, or A compounds
2. Grooving and siping allowed.
3. Soaking NOT allowed.
 
Safety
1. All drivers and cars must adhere to the safety rules herein supplied.
 
Plymouth Speedway reserves the right to change, delete or add to rules throughout the racing season.
The management reserves the right of interpretation of all rules and the right to inspect and reject
any car and/or driver, crew member, etc. during the racing program.
 
For any questions on the Plymouth Speedway rules, please call Tech Director Mike Zielinski 1-(574) 532-7969
 

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