2018 Lone Star Street Stock Rules
I. ENGINE RULES PACKAGE: Engine Option used must be listed in permanent lettering on left side of hood. For example: Option 1
368 Cubic Inches or smaller will weigh a minimum 2850 lbs. May run any aluminum or cast iron intakes (no custom sheet metal). 4 bbl. Intake: webbing on top may be removed down to 1” only. Option 1 max. 8” spoiler. No porting or polishing.
Unlimited Cubic Inches will weigh a minimum 3000 lbs. May run Edelbrock (2701, 2716, 2176, 3721, or 2181), Weiand (7547-1, 7515, 7516, 7545, or 8323), or any low rise stock OEM 4 bbl. Intake: webbing on top may be removed down to 1” only. Option 2 max. 6” spoiler. No porting or polishing.
1. Steel heads, block and oil pan only.
2. OEM passenger vehicle production block only. All engines must match frame and body: Ford to Ford, GM to GM, Chrysler to Chrysler, no Toyota’s
3.Castings and fittings cannot be changed, no machine work on outside of engine.
4. No roller lifters on cam allowed. Full roller rocker arms allowed.
5.Flat tappet lifters on cam. No mushroom lifters. Cannot alter OEM lifter bores.
6. OEM firing order cannot be changed.
7. Steel or aluminum water pumps allowed. ‘Wet’ sump oiling system only.
8. Accumulator allowed – cannot be located between seat and door bars.
9. These modifications are allowed:
(a)Aftermarket valve covers & cover breathers
(b)Screw-in studs, poly locks, guide plates, & stud girdles
(c) Aftermarket valve springs
(d) Claimer oil pans & reduction pulleys
10.Radiator must be mounted in front of engine. Cooling system may be modified. Overflow tubes must be directed to ground.
Holley 4412 500 cfm 2 barrel only. No 4412hp. No porting or polishing. No changing of boosters, or altering base plate and throttle shafts in anyway. Only metering plate can be modified. Carburetor will be checked with a no-go gauge top and bottom. Carb spacer-may run 1” maximum carburetor spacer, may not protrude into intake manifold. Maximum gasket thickness .070”
IV. FUEL SYSTEM:
1. Automotive gasoline or racing gasoline only! NO Methanol or E85. Additives of any kind are not allowed.
2. Electric or belt driven fuel pumps are not allowed.
3. A limit of one (1) standard fuel filter is allowed between the fuel cell and the carburetor. Fuel filter cannot be mounted in the driver compartment.
4. No cool cans or cold air boxes or air cleaner duct work.
5. Fuel cell must be commercially manufactured for racing applications. No boat or stock automotive fuel tanks. Must be securely fastened inside trunk area of race car. Fuel cells must be in steel container. All mounts must be made of steel and surround the fuel cell and attached to frame or roll cage.
6. Must have check valve. Fuel cell vent, including cap vent, must have check valves, a flapper spring or ball-type filler valve.
1. One 12 volt passenger car battery only, must be securely mounted between and above frame rails, and in a secured approved battery box. Battery must not be mounted in driver compartment.
2. Starter must bolt in OEM location. Car must have capability of starting without being pushed or pulled. Car must leave initial staging area on demand, unaided, or go to rear of that race.
3. Only one (with no live timing adjust) ignition box is allowed. Coil must remain in cap for HEI type ignitions. All ignition wiring must be accessible for inspection.
4. High End Rev Limiters allowed, may use MSD PN 8728 or MSD box
5. No unapproved cameras, transmitting or listening devices (exception is one-way RACEceiver radio by officials), timing retard controls, or digital gauges (including tach). No electronic monitoring computer devices capable of storing or transmitting information except memory recall analog tach.
6. All wiring must be visible for inspection. OEM type alternator with internal regulator allowed. No electronic traction control devices.
7. Kill switch required within easy reach of the driver. The switch must be clearly marked “OFF” and “ON”. All battery cables and electrical must be securely mounted and protected.
A. OEM automatic transmission with10 inch working or dummy torque converter or coupler. Lightened flex plates are not allowed.
1. Flex plate must be full, not lightened, recommended SFI approved.
2. At least one forward, reverse and neutral gear must be operational.
3. Must have approved scatter shield constructed of minimum 0.125 inch by three inch steel, 270 degrees around flex-plate.
4. Manual bump starts allowed.
B. Standard Transmission
1. 3 or 4 speed OEM transmissions. Must have at least one forward and one reverse gear.
2. Flywheels may be lightweight. Must be able to stop and take off unassisted.
3. Direct drive internal fluid assist style transmission is allowed. Brinn, Bert, Gator, etc.
4. Must have approved scatter shield constructed of minimum 0.125 inch by 3 inch steel, 270 degrees around flywheel. Flywheel or flex-plate must be full, recommended SFI approved.
1. Round tube headers only. Headers must expel gasses away from the driver’s compartment. No zoomies, or Tri Y, allowed. Exhaust may not protrude through hood or floor pan. Exhaust cannot be connected, no crossovers or equalizer tubes. All tubes must meet at one collector. No electronic devices allowed. MUFFLERS NOT REQUIRED.
VIII. CHASSIS - Car:
1. Any American OEM full body rear wheel drive passenger car frame with a 108” or longer wheelbase, 1964 or newer. GM to GM, Ford to Ford, Chrysler to Chrysler, No Toyotas. May use a registered stock replacement XYG metric chassis. Frames must be verifiable.
2. Frame rails only may be shortened. Wheelbase tolerance will be 1”, which means a minimum wheelbase of 107”.
3. All uni-body cars must have front frame and rear frame tied together. Frames may be “X” braced. No front wheel drive, or 4 wheel drive frames permitted.
4. All frame cross-members must be unaltered. Frame may be notched for fuel pump clearance only. Must remain in stock location exception: transmission cross-member may be altered or removed. Front frame horns may be removed from front of steering box and idler arm mount. Rear frame horns on GM 4 links may be shortened up to shock brackets. Must have a 360 degree drive-shaft loop no more than 6” behind the front u-joint. Must be minimum 0.250” x 2” steel or 1” tubing.
5. Rear bumpers may be fabricated of round tubing with a minimum 1.250 O.D. (maximum 2 inch) 0.083 (maximum 0.250) wall thickness. Rear bumpers may not extend past the width of the body.
6. Front bumpers may be fabricated with round tubing minimum 1.250 O.D. (maximum 2 inch) 0.083 (maximum 0.125) wall thickness. Corners must be bent and round. Ends of tubing must connect to front frame horns. If OEM bumper is used, must be behind nose piece.
8. Motor mounts may be aftermarket and engine may be moved. #1 spark plug may sit no further back than upper ball joint center line.
IX. CAR BODY:
1. 1964 or newer American OEM stock passenger car bodies or aluminum aftermarket pro stock bodies allowed. Aftermarket bodies must have at least one door bend on each side, minimum 4” (NO LATE MODEL WEDGE BODIES, MODIFIED, or SLAB BODIES). Must have an approved stock car nose piece. All cars must have all four fenders and must resemble a production vehicle (MUST RESEMBLE A STOCK CAR). All bodies must be approved by officials. All glass, plastic, upholstery, rear seats, lights, mirrors and chrome must be removed. Interior tin or other covers not allowed. Doors must be welded or bolted secure. All sunroof and T-top openings must be covered with sheet metal. Must have nose pieces. Front nose pieces and rear tailpieces must be securely riveted or bolted in place. If no aftermarket tailpiece is used car must have 8” tall strip of sheet metal secured to deck lid and quarter panels on the rear of body above bumper.
2. After market fiberglass steel or aluminum roof allowed as long as it has OEM slope/contour.
3. Front OEM firewall may be replaced using steel fabricated firewall, 18 gauge or minimum 0.049 inch thickness. Top of firewall can be no further back than 12 inches from the back of engine block, measured horizontally. Bottom of firewall can be no further back than rear of oval body mount frame hole. Dash must not extend more than 24 inches back from top of firewall. Dash must be flat, rear can be no higher than front, except for cowl in front of driver. At a minimum firewall must go from inside of frame rail to inside of frame rail. OEM floor pan may be replaced using steel fabricated floor pan, passenger floor pan not required but interior decking would then be required around driver,18 gauge or minimum 0.049 inch thickness, securely welded to frame. Floor pan may be replaced from front firewall to rear halo supports. Floor pan must remain flat/OEM appearing from frame rail to frame rail, can be no higher or lower than top or bottom of frame rail. Exception is maximum drive shaft tunnel. Tunnel must remain similar to OEM tunnel in size. Interior must be decked, must have access panel for inspection. Rear firewall may be aluminum or steel and no further forward than rear halo and no higher than bottom of rear opera windows. All holes in firewalls must be covered with metal. No driver-adjustable devices allowed while car is in competition except brake bias adjuster. No mirrors. Hood must be secured by a minimum of four hood pins located at all four corners. No tilt front ends. Back of hood must be sealed from driver area.
4. Spoilers are allowed with a max width of 60” not to exceed outer edge of body, max 9” of material and no more than 3 supports allowed. Spoiler ends and supports may exceed 1” height of spoiler center and are allowed a maximum length of 16”. No space between deck lid and bottom of spoiler is allowed.
X. CHASSIS -Trucks:
May be built from full size, short-bed, regular cab ½ ton truck frame, no straight front axle. GM to GM, Ford to Ford, Chrysler to Chrysler, and no Toyotas.
XI. TRUCK BODY:
1. Truck cab shell must be OEM steel in stock location measured from front ball joint center line. If truck body is used, it must be on a truck frame. Doors, fenders, hood, and minimum bed body 70” long may be aluminum but must have OEM contours; must resemble an OEM truck body.
2. Must have a workable tailgate
3. Bed cover may be used but is not required unless bed floor has been removed. If a bed cover is used it must have a 24” by 24” full view inspection hole.
4. Bed cover must be bent up or down on rear to not be a danger to other cars, the bend may be used as the spoiler if wanted.
3. Front and rear bumpers for trucks: follow same rule as cars, but no heavy truck bumpers front or rear.
XII. ROLL CAGE:
1. Main cage must consist of continuous hoops, minimum 1.666 inch O.D. (1.750 recommended) with a minimum 0.095 wall thickness (low carbon or mild steel recommended). Four post main cage required and must be properly welded to frame, NOT floor pan. Poor or missing welds may be deemed unsafe by a track official and may result in disqualification.
2. A minimum 1 crossbar (minimum 1.666 O.D.) required in top halo and must be welded diagonally. Rear halo must be “X” braced. Front and rear down bars must be tied side to side. Top door bar must be a minimum of 36 inches inside to inside of front and rear down bars. Must be a minimum of 26 inches at bottom of top halo measured inside to inside of front and rear down bars. Must be a minimum height of 16 inches from top of door bar to bottom of halo. With helmet on and driver securely strapped in driver head must not protrude above bottom of roll cage. All bars within reach must be padded with a material accepted by track officials, flame retardant recommended.
3. Minimum of (4) 1.666 O.D. or (3) 1.750 O.D. horizontal door bars required on driver side (minimum 0.095 wall thickness). Horizontal door bars must be mounted perpendicular to frame and must have a minimum of (4) uprights from frame to top door bar.
4. Steel door plates made of 18 gauge or 0.049 inch minimum thickness must be securely welded to outside of driver door bars. Plate must cover from top door bar to rocker and must extend from rear down bar to 5 inches in front of front edge of seat. Plate must be visible for inspection.
5. Rear kickers (down bars) and fuel cell protection required (minimum 0.083 wall thickness), front hoops are allowed. If front hoop is not used must have two front kickers (down bars) welded to frame no further back than front of upper a-arm. Fuel cell protection and front kickers or hoop must be a minimum 0.083 wall thickness and 1.250 O.D. A maximum of (2) additional bars may be added for radiator protection not counting bar tying frame horns together and must be within confines of the body. Fuel cell protection must be same height as fuel cell and extend from frame rail to frame rail (maximum 1.750 O.D. tubing allowed) and must remain inside confines of the body.
6. All vehicles MUST have tow loop or strap mounted front and rear and must be easily accessible.
XIII. FRONT SUSPENSION:
1. Steering Linkage: May use an aftermarket center link and idler arm, and rod ends and swedge tube for tie rods. All components must be steel unaltered and match frame. OEM steering column may be replaced with steel steering shafts (steering shafts must have a joint every 5 ft., collapsible steering shafts highly recommended). Steel knuckles only. Steering wheel and quick release (required) may be aluminum.
2. Upper A-Frames: Upper A-frames may be replaced using aftermarket upper A-frames. Bolt in ball joints or screw in ball joints allowed. Steel or aluminum cross shaft allowed. Can also use swedge tube style upper a- frame with screw in ball joints. Upper A-frame mounts on frame must be steel. Upper A-frame mounts may be non-adjustable steel weld on and may be moved from OEM location.
3. Lower A-frame: may be replaced with any other unaltered OEM lower A-frame as long as it bolts up to stock unaltered lower A-frame mounts. Must have stock OEM rubber bushings or aftermarket replacement steel or aluminum bushings. All lower A-frames must be unaltered OEM. Bolt on spindle savers allowed. GM to GM, Ford to Ford, Chrysler to Chrysler, No Toyotas.
4. Add-on weight jacks, centered over front springs in stock location;
non-adjustable from inside driver compartment. Coil springs must be minimum 4.5 inches O.D. and non-progressive and 1 piece.
XIV. REAR SUSPENSION:
All mounts must be steel and welded solid, no give. All components must also be steel. GM to GM, Ford to Ford, Chrysler to Chrysler, No Toyotas. Suspension type must match type of frame used, except if running 3 link suspension.
A. GM 4 LINK FULL BODIED CARS & METRIC CARS:
No bearing type or offset bushings allowed. Lower trailing arm mounts may be 7.5 inches long maximum. A total of 5 holes may be drilled to allow for lower control arm adjustment. Fabricated rear trailing arms allowed and must remain stock dimensions.
Upper trailing arms must be level side to side and non-adjustable and must remain stock dimensions, may be fabricated with 2x2 tubing.
No pan-hard bars, chains or cables.
Coil springs must be minimum 4.5 inches O.D. and non-progressive.
No coil over eliminators. Weight jacks allowed on rear springs.
Spring mounts center line on rear end housing may be no further forward than the front side of the rear end housing or no farther back than the backside of the rear end housing. Rear end housing can be no larger 3” OD
B. LEAF SPRING CARS:
Aluminum lower blocks and multi-holed adjustable shackles allowed on rear only. No sliders no composite leafs
Leaf spring Camaros may use Chrysler leafs. Front leaf mount must remain in stock location side to side. May only be moved up or down and may be adjustable (see GM 4 link).
C. TRUCK SUSPENSION: Rear suspension must match frame being used. Leaf spring trucks: may move rear axle to top of leaf spring. Front leaf mount must remain in stock location side to side. May only be moved up or down and may be adjustable (see GM 4 link).
Coil spring trucks: OEM coil spring suspension with long trailing arms with solid panhard bar mounted behind rear end.
D. 3 LINK SUSPENSION allowed with solid panhard bar with hemi joint ends, no soft rubber bushings, mounted behind the rear end minimum length 26”. Solid pullbar with hemi joint ends, no soft rubber bushings. No pullbar with springs or biscuits allowed. No lift arm of any kind.
XV. REAR END:
1. OEM or Ford nine-inch rear-ends or floater rear-ends are permitted, with maximum 3” OD housing tube but must be mounted like stock rear-end for that make and model of frame. No quick change allowed.
2. Rear-end carrier must be locked: welded, mini spools or full spools. No torque dividing differentials.
3. One inch inspection hole in housing required.
4. Gun-drilled or titanium axles are not allowed (axles must be made of steel).
5. All mounts must be securely welded, no floating mounts.
1. Steel, unaltered OEM, or unaltered OEM replacement, four wheel disc or disc (front) and drum (rear) brakes. Steel hat and rotor assemblies allowed on floater rear ends, must be stock diameter. Aluminum GM drums are not allowed.
2. Aftermarket pedal assemblies with single or dual master cylinders allowed. No oil bath front hubs. Hubs/rotors, axle flanges and drums may be changed to different bolt pattern and larger studs. Must use OEM vented rotors. Drilling, lightening and/or scalloping rotors are not allowed.
3. Brake proportioning valve allowed on right front only and may be within reach of driver.
4. All calipers must be OEM steel
5. Must have three functional brakes. Only right front may be omitted. Brakes will be tested!
XVII. SHOCKS: One unaltered steel body shock, nonadjustable, per wheel. No coil-over shocks, air shocks, remote reservoir shocks. No Schrader or bladder type valve allowed. No coil-over eliminators.
XVIII. TIRES: Any Hoosier 500 or American Racer 500, American Racer KK704, G60, Any Asphalt NASCAR Pulloffs 10" wheels ok on pulloffs only , otherwise 8” Rims & Tires Only. Beadlocks allowed on right side only.
1. All race cars must have numbers that contrast to body color and must be minimum 4 inches thick and 18 inches tall for both sides and must be 4 inches thick and 20 inches tall for roof and must be clearly legible.
All race cars must have numbers on the right rear corner of the back of the vehicle and must be minimum 4 inches tall.
2. Maximum seven inch visor allowed on front windshield area. This includes additional tape.
Maximum one inch wide by two inch tall steel rub rails allowed – bolted flush to body.
3. Officials reserve the right to approve or disapprove any image of lettering or sponsorship on any race car or pit vehicle entering race track property. Keep in mind this is intended to be a family fun sport.