OFFICIAL 2012 SPECIFICATIONS FOR WILLOW SPRINGS
INTERNATIONAL STOCK CAR ROAD RACING ASSOCIATION (ISCRR)
SUPERLATEMODEL STOCK CAR CHALLENGERULES
NOTICE: ALL EQUIPMENT IS SUBJECT TO THE APPROVAL OF ISCRR TECH OFFICIALS. NO EQUIPMENT WILL BE CONSIDERED AS HAVING BEEN APPROVED BY REASON OF HAVING PASSED THROUGH INSPECTION. ALL ISCRR MEMBERS ARE REQUIRED TO BE FAMILIAR WITH ALL WILLOW SPRINGS ISCRRTRACK RULES.
Any modifications not covered in these rules will not be allowed unless approved by the Willow Springs ISCRRTech Official.
1. COMPETING MODELS
(a) Open to stock appearing automobiles provided they comply with, and adhere to, specifications as outlined for this division.
(b) Competing models as selected by Willow Springs ISCRR. The following cars 1999 through 2012 are the only eligible models approved for competition:
(1) CHEVROLET, Monte Carlo, Impala.
(2) DODGE, Intrepid, Charger.
(3) FORD, Taurus, Fusion.
(4) PONTIAC, Grand Prix.
(5) TOYOTA, Camry.
2. GENERAL CAR AND BODY REQUIREMENTS
(a) General Car:
(1) Original Five Star Body templates for the year of the car’s manufacture will be used. The ABC (Approved Body Configurations) Body Rulebook is the standard guideline used for ABC bodies at Willow Springs ISCRR. Refer to the current ABC Body rulebook for all body installations and guidelines. (
(2) Cars must be neat appearing. All panels must fit properly and be free of sharp edges. All panels must be painted.
(3) The bodies will be required to fit Willow Springs ISCRRapproved Five Star original body templates and ABC overall body template(s). All bodies must meet the specifications indicated by the ABC rulebook or body template for earlier year bodies.
(4) Bodies must be standard as produced by aftermarket manufacturer metal or fiberglass.
(5) All attachments must be safe and soundfastened in a manner acceptable to Tech Official.
(6) Flat or slab sided bodies not permitted.
(7) Carbon Fiber or Kevlar body parts or fasteners not permitted.
(8) Ceramic-coated parts not permitted.
(9) Down force and high performance type bodies not permitted.
(b) Floorboards:
(1) All holes in floor must be sealed.
(2) Floorboard must be a minimum of 24-gauge steel.
(3) Floorboard and tunnel must be welded in place and show good workmanship. Subject to the approval of Willow Springs ISCRRTech Officials.
(c) Interiors:
(1) Interior must be completely enclosed.
(2) Interior panels must be trimmed neatly around roll cage and sealed for fire protection.
(3) Interiors panels must be painted and must fit properly and free of sharp edges.
(4) Interior panels except crush panels must be fabricated of 24-gauge steel minimum and it is recommended that all interior panels be welded in place.
(5) Interior holes must be sealed.
(6) Interior door shelves not permitted. Panels must direct toward floor tunnel.
(7) Interior upper door crush panels at right and left side with a flat shelf not permitted.
(d) Overall Car Weight:
(1) All cars will weigh 2950 pounds including driver before the race.
(2) Left side weight will be 51% minimum including driver, with both hands on steering wheel.
(3) All cars will be weighed on Willow Springs ISCRR’s scales. These scales will be the only method for determining a cars weight.
(e) Added Car Weight:
(1) Added weight must be in block form of no less than ten (10) pounds, no pellets, sandbags, etc.
(2) All added weight must be painted white and the car number must be clearly visible on each piece.
(3) All added weight must be securely bolted in place with a minimum ½ inch diameter, grade 5 bolts with locking nuts. No aluminum brackets.
(4) Weight may not be added to the outside of the frame rails, except when lead is enclosed in a weight tray.
(5) Lead enclosed in a weight tray must be immobile and must have two 3/8-inch grade 5 bolts as a secure stop at each end of the weight tray.
(6) Weight may not be located inside the driver’s compartment.
(7) Any lead mounted behind the rear axle must be a minimum of two (2) inches forward of the rear of the fuel cell.
(8) Dislodged weight cannot be returned to cars for weighing after an event.
(9) Weight shifting devices shall not be permitted.
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3. DETAILED CAR BODY REQUIREMENTS In addition to the car body requirements in section 2.
(a) Front Air Dam and Nose:
(1) Holes for ducting are allowed in the front air dam for air inlet only.
(2) All support brackets and bumpers must be mounted behind nose.
(3) Front nerf bars, or external reinforcing bars are not permitted.
(4) Reinforcement or added tubing may be placed behind approved nosepiece.
(5) The nose may not be altered with no trimming, or attachments, to enhance aerodynamic performance.
(6) Nose widths must remain stock as per ABC Body rulebook. Sectioning or spacers not permitted.
(7) The nose or side valance can be no more than 1/2-inch wider than the outside crown of the tire on each side at anytime.
(8) An adjustable Five Star body like material piece may be attached to the lower edge of the nose. This piece must conform to the body similar to the stock Five Star nose and may not extend back beneath the nose of the car. Willow Springs ISCRR Tech Officials must approve all attachments.
(b) Rear Spoiler:
(1) Spoiler dimensions must comply with the ABC Rule Book or 6 ½ inches tall 60 inches wide width at 55, 70, or 90 degree angles.
(2) Rudders or braces in front of the spoiler are not permitted. Braces allowed behind the spoiler and may be adjustable.
(3) Spoiler must be fabricated of a material that will not allow it to flex or in any way deform during competition.
(4) Only aluminum and lexan five star manufactured spoilers allowed.
(5) Spoiler must follow the contour of the rear deck lid. Mounting must be approved by Willow Springs ISCRRTech Officials.
(6) The spoiler must be slotted ½ inch in the center for each make of car to fit the ISCRR overall body template.
(c) Windshields:
(1) A clear (non-tinted) Lexan polycarbonate windshield must be used. Minimum 1/8-inch thickness.
(2) A minimum of two evenly spaced 1/8 inch x 1 inch metal straps, must be mounted securely to the dash and roof panel, inside of the windshield, to secure windshield in place. These supports must not block the vision of the driver.
(3) Angle of windshield must meet Willow Springs ISCRRtemplate tolerance.
(d) Rear Window:
(1) The rear window must be used and must be made of clear lexan polycarbonate with a minimum 1/8 inch thickness.
(2) A minimum of two 1/8 inch x 1 inch evenly spaced metal straps must be bolted to the roof at the top and deck support panel at the bottom to secure window in place.
(3) During competition the rear window must maintain stock configuration. No collapsible rear windows.
(4) Angle of rear window must meet Willow Springs ISCRRtemplate tolerance.
(e) Side Windows, Quarter Windows, Air Deflectors and Net:
(1) Side Window and Quarter Windows:
(A) Quarter windows must be located in stock location, clear lexan polycarbonate recommended.
(B) Quarter windows may be used for air intake only.
(2) Deflector and A-post:
(A) A-post deflector must be of clear lexan polycarbonate and may not protrude outward.
(B) B-post air deflectors are not permitted.
(C) B-post leading edge may be use as an air intake only.
(D) No side door windows may be used; however an air deflector may be used to support the windshield A-pillar. The deflector, when measured horizontally, must not be longer than twelve (12) inches in length.
(3) Window Net:
(A) One (1) inch mesh window net mandatory. Permanently mounted at bottom with approved quick release at top.
(B) Window net must be within 5 years of manufacture date.
(C) Window net must have a manufacture’s date tag or will not be permitted.
(D) The latch must be mounted at the top in the front to roof bar or at the top of front roll bar leg, near roof bar, and release from the inside.
(E) All window screen mounts must be a minimum 1/2 inch diameter solid steel rod on the bottom and a
minimum one (1) inch wide by 3/16 inch thick flat steel or a minimum 1/2 inch diameter solid steel rod
on the top, with mounts welded to the roll cage.
(f) Rear View Mirror:
(1) All cars must have one (1) rear view mirror placed at the top and center of the windshield.
(2) One left side 4-inch or smaller spot mirror permitted.
(3) No mirror may extend outside of the body.
(g) Dash Panel:
(1) All cars must have a complete dash with no offset.
(2) Dash panel may be fabricated from aluminum.
(h) Firewalls:
(1) Front and rear firewalls required. All firewall holes must be sealed and covered.
(2) Full firewall must be constructed with a minimum 24-gauge steel sheet metal.
(3) Fuel cell compartment firewall must be constructed of 24-gauge steel, and completely seal driver’s area from fuel cell area.
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(i) Doors:
(1) Door panels must be fastened in a manner acceptable to Tech Official.
(2) All doors must be securely fastened to fender and quarter panel.
(3) Doors must retain factory configuration.
(4) All doors sides must be mounted as per ABC Body rulebook to the contour of tire.
(j) Fenders:
(1) All fenders must be mounted as per ABC Body rulebook, and not concaved or deformed behind tires.
(2) Tires and wheels must remain under body.
(3) All fenders must be mounted to front of door with rear of fender to form to the crown of tires.
(4) Fenders may only be trimmed as per ABC Body rulebook at wheel opening for tire radius and minimal tire clearance only.
(k) Quarter and Rocker Panels:
(1) Quarter panels must be mounted as per ABC Body rulebook.
(2) Quarter panels behind tires cannot be pulled in or deformed.
(3) Quarter panels at B-post must retain stock dimensions from Five Star specifications at roof location from side to side.
(4) Rocker panel skirts must hang vertical and not bow out.
(l) Grilles: Openings must retain the same shape and size as the stock production.
(m) Hood:
(1) Hood must maintain original configuration, however a molded in, stock appearing, hood scoop may be used. Maximum height of scoop, when measured from flat section of hood, shall be four (4) inches. Opening must face the windshield. All installations are subject to approval of Willow Springs ISCRRTech Officials.
(2) Hoods with scoop must maintain a maximum of 3-inch x 26-inch opening.
(3) Hoods or cowls may not be cut or altered in anyway from manufacturer, except for a 3-inch by 26-inch opening at center at the base of the windshield, and to hood must seal to windshield.
(4) Hoods must be held in place with hood pins. A minimum of four (4) in front and two at the rear of the hood (unless hinged) are mandatory.
(5) Hoods must lie flat on fenders and must remain sealed to windshields at all times.
(6) All cold air boxes and air cleaners must fit under hood and not be visible.
(7) Five Star cowl air intake opening between the hood and the windshield, must retain the original opening dimensions and may not be modified. Any body with a cowl air intake opening may not have any other openings in the hood or scoop.
(n) Roof:
(1) Roofs must fit template as per template of year of body make or ABC Body rulebook.
(2) No crowning or altering shape of roof.
(3) All roofs must be stock configuration and mount in stock location with no alterations.
(o) Rear Deck Lids:
(1) The rear decklid must comply with ABC specifications.
(2) Deck lid area must remain flat to the spoiler as per ABC Body rulebook.
(3) Deck lid area must remain standard in all respects. Bodylines and shape of the deck lid must not be changed.
(p) Bumpers and Rear Filler Panel:
(1) Rear bumpers in top quality condition are required at all times.
(2) Filler panel above and below rear bumpers must be complete with no holes or louvers, and must be riveted to rear bumper.
(3) No cutting, trimming, or holes permitted in bumper cover.
(4) All rear bumper covers must remain with manufacture’s lower lip at bottom.
(5) The rear bumper may not be altered, with no trimming, holes or attachments permitted.
(6) Rear nerf bars, or external reinforcing bars are not permitted.
(q) Identification and Marking:
(1) ISCRR reserves the right to assign or restrict the display of decals, identification, and advertising on race cars.
(2) Numbers must be at least 18 inches high and neatly lettered on both sides of the car in the center of the door.
(3) The top front corner of each door should be available for the placement of series sponsor decals.
(4) Decals are permissible in place of painted numbers.
(5) Gold or Silver foil numbers are not permitted.
(6) Block type numbers six inches in height must be attached to the right front headlight area, and also the right rear taillight area.
(7) Contingency sponsor decals must be in place to receive awards, or prize money from contingency sponsors.
(8) Series and contingency sponsor patches must be worn to receive awards.
4. GENERAL ENGINE REQUIREMENTS
(a) Only engines of a type approved by Willow Springs ISCRRare allowed. Absolutely no GM sealed engines permitted.
Engines may be interchanged among make lines. The following characteristics must be identical with the
production engine upon which recognition of type has been granted. No coating on any internal engine surface or
components, including but not limited to ceramic or Teflon.
(b) All parts listed below must originate from stock production castings and forgings that have been machined according to the normal machining schedule utilized for standard production parts only:
(1) Cylinder Block
(A) Material
(B) Number of cylinders
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(C) Angle of cylinders
(D) Number of main bearings and type
(E) Integral or separate cylinder sleeves
(F) Location of camshaft
(G) Location of crankshaft
(H) Overall configuration
(2) Cylinder Head
(A) Material
(B) Number of valves per cylinder
(C) Type of combustion chamber
(D) Location of spark plug
(E) Orientation of spark plug
(F) Arrangement of valves
(G) Valve location in relation to the cylinder bore
(H) Type of valve actuation
(I) Number of intake ports
(J) Number of exhaust ports
(K) Center distances of intake ports referenced to the cylinder bore
(L) Center distances of exhaust ports referenced to the cylinder bore
(M) Shape of intake and exhaust ports at mating faces of manifolds
(N) Angle of port face relative to mating face of head to block
(O) Shape of intake and exhaust ports inside runners
(P) Firing order
(Q) Lifter bores
(R) Valve angle
(c) No change from the Willow Springs ISCRRapproved standard production automobiles or component parts will be permitted except as specified in the following rules for engine preparation.
(d) No titanium parts permitted except as allowed.
5. DETAILED ENGINE REQUIREMENTS
(a) Engine Location:
(1) All engines must be located so the center of the forward most spark plug hole a maximum of one
and one-half (1-½) inches behind the centerline of the upper ball joints. Ford engines may be set back as
follows: All Ford engines must be located so the center of the forward most spark plug hole is a maximum
of two and one-half (2-½) inches behind the centerline of the upper ball joints.
(2) The centerline of crankshaft must be within one (1) inch of the centerline of the tread width.
(b) Engine Mounts:
(1) All engine mounts must be securely bolted.
(2) Adjustable engine mounts are not permitted.
(c) Engine Displacement:
(1) The maximum allowable cubic inch displacement at any time shall be 360. Only V-8 engines are eligible for competition.
(2) The formula used to determine static c.i.d. will be as follows: Bore X Bore X .7854 X Stroke = Cubic Inch Displacement of each cylinder. All cylinders added together equal the total cubic inch displacement of the engine. This is the only formula Willow Springs ISCRRwill use during an engine teardown. A P&G cubic inch measurement tool may also be used to evaluate cubic inches without teardown.
(3) In all cases, compression ratio will be calculated by any means deemed proper by Willow Springs ISCRRTech Officials.
(d) Engine Compression Ratio:
(1) The term “11.1-1 compression ratio engine” shall mean any engine having a compression ratio of less than 11.1 to 1. The maximum compression ratio is 11.1 to 1 on all engines.
(2) In all cases, compression ratio will be calculated by any means deemed proper by Willow Springs ISCRRTech Officials.
(e) Engine Block:
(1) All engine blocks must meet the following requirements:
(2) All engine blocks must be a product of the manufacturer of the Make being used in competition. Aftermarket or aluminum blocks not permitted.
(3) Engine block must retain all standard external dimensions with the notable exception of the maximum allowable overbore and the surfacing of the block deck. Angle cutting of the block deck, or grinding or milling for weight reduction of the block is not permitted.
(f) Internal Changes:
(1) Internal polishing of the engine block is allowed. Light deburring is permissible.
(2) Screening of the intake valley area, for debris protection, is allowed.
(g) Piston/Rods:
(1) Any three (3) ring piston may be used.
(2) Only solid steel connecting rods allowed. Hollow beam, titanium, aluminum, or stainless steel rods are not to be used at any time.
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(3) All rods must maintain the minimum/maximum rod length listed:
Minimum - Maximum
(A) General Motors 5.700 - 6.250
(B) Ford Cleveland 5.700 - 6.250
(C) Ford Windsor 5.700 - 6.250
(h) Oil Pans and Coolers:
(1) All oil pans and coolers must meet with the following requirements:
(2) All oil pans must be made of steel and must be approved by Tech Officials.