2018 Midwest Truck Series Rules
For Printable PDF File
These guide lines are to be used as a cost-effective tool for our Midwest Truck Series teams. The truck and parts used with this engine package will be under the closest watch to not let the inexpensive cost of the engine effect the cost of the chassis and components there of. This is a cost saving measure and needs to be used as that. Any part at any time may be deemed ineligible for the use in the Midwest Truck Series. Any dollar amount is MSRP.
Minimum height on all body panels is 3 "except for nose. All bodies will be fiberglass or aluminum. All bodies must be from official approved supplier. All bodies must be approved Midwest Truck Series styles and meet templates. NO carbon fiber, Kevlar or light weight body panels are allowed. Must meet Five Star Bodies template rules and heights being the official body of the Midwest Truck Tour Five Star will supply templates to the series. These bodies must fit the official templates for the Truck Series. Minor body changes or styles will result in a weight penalty. No additions may be added to the body or any of its components. All bodies will be used as produced by manufacturer. Trimming of panels allowed for fitment. No other holes, shortening, lengthening, deforming or changing of any body panel. Approved bodies are: 1997 though current Chevrolet, 1997 though current Ford, 1997 though current Dodge & 1997 through Current Toyota. Beds must be covered with sheet metal, aluminum or fiberglass and must have a minimum 24” x 18” opening for inspection and filling of fuel. No through body fillers allowed. Fenders and quarter panels must be as supplied from body manufacture and must be cut to allow proper wheel openings. Must be official approved and neat appearing. Five Star Race Car Bodies is the Official Truck Body of The Midwest Truck Series. All body parts must appear as a stock type truck.
All Measurements are with driver out of Truck. Except weights.
All Measurements are measured off of 4" chassis blocks.
79 ½ “ max. width.
No part of the NOSE maybe lower than 4 inches at any time.
No other bars in front of nose.
Nose must remain stock appearing for type of truck.
54 inch minimum roof height measured 10 inches back from top center of windshield.
Roof must meet templates.
Must be 0.125” lexan, and have three braces
Must be installed and must be lexan.
Must have 16” min. window opening. Max 10” vent window only. Straight cut. No bowed windows.
Must meet body manufacturer templates.
Stock appearing body panels only. May not be shortened.
Must seal to the wind shield.
No hood scoops allowed.
20”x 3” maximum opening at base of windshield,
1” max. painted body color with capped and smooth ends, tight to body panels and securely mounted to frame.
Must be neat appearing.
Clear rub rails allowed.
Must be steel and must be behind nose and tail panel.
Must have tow hooks on front and rear.
Must be complete as shipped from manufacturer.
Most tail gates will also include rear bumper cover and must remain as shipped. No holes in rear panel or bumper including lower lip. Must be as supplied by manufacturer.
5” x 65” maximum, and is mandatory.
No lips or wicker bills on spoilers.
Must remain straight, no curved spoilers.
Must be LEXAN AND CLEAR ONLYInterior:
Interior sheet metal from the top drive shaft tunnel must remain flat or rise on a plane to passenger window opening with a maximum
4” window ledge.
No ‘boxed in’ or ‘tunneled’ driver compartments.
No plastic or composite material may be used inside the driver’s compartment.
The driver’s compartment must be fully enclosed around the driver.
Must have a driveshaft protection plate of 1/8” steel wrapping around left side of the drive shaft area, from floor to bottom of interior.
Drivers compartment must be completely sealed other than side windows for safety.
Frames and Suspension:
THE TUBULAR FAB STYLE CHASSIS IS THE CHASSIS OF CHOICE AND RECOMMENDED. Following are the minimum specification requirements for roll cage construction. Midwest Truck Series officials reserve the right to sonic test any or all structural chassis members at any time. Structural chassis member(s) found in violation of minimum requirements render that chassis ineligible for competition until minimum standards are met or exceeded. Drilling holes to lighten any part of the body, chassis, suspension or bolts is not permitted.
Only steel round, rectangular or square tube is approved for roll cage or chassis construction of any major supportingsub-structures. Wall thickness, size, and/or diameters are specified where necessary.
Frames newly built will be fabricated.
Main frame rails must be steel, minimum of 2”x 3” rectangular tubing, with a minimum wall thickness of 0.125”.
Main frame rails must have an “X” brace between them on the fab style frame. Front and rear stubs must be mounted on chassis centerline.
Wheel base will be 108” minimum and 112” Maximum.
Tread width 66” maximum with referee at center of spindle,
No aluminum chassis parts allowed.
4 post roll cage required.
Main hoop and both A pillar bars must attach to the main frame rails.
4 curved door bars are required on the driver’s side, equally spaced from the main frame rail up to the driver’s shoulder.
Two vertical braces between each bar and to the main frame rail are also required.
An 18”x24”x 1/8” thick steel plate must be welded to the outside of the driver’s door bars.
Passenger Side Door Bars:
Currently “X” bracing is legal . Main hoop, both A pillar bars, shoulder bar, dash bar, driver’s door bars, passenger door bars, roof hoop, and rear down tubes must be minimum 1 ¾” diameter 1018 mild steel tubing with a minimum wall thickness of 0.095”. 2 rear down tubes must attach to the top of the main hoop and to the rear stub behind the axle. Front engine hoop must attach to the main Cage near the intersection of the dash bar and A pillar bars, and to the front stub forward of the axle. Top of cage to bottom of frame minimum 47 ½”, and top of cage must be within 6” of roof panel. Foot bars are required 1 ½” X 0.95” wall. Side halo bars must be centered in frame rails. Roof hoop shall be minimum 32 wide and 28 long.
Conventionally mounted 5” spring suspension or coil over suspension allowed.
Maximum price $200.00 race ready Shocks can be removed and/or disassembled for inspection at any time.
Only one (1) shock and spring per wheel. Must be mounted as/in a conventional style and be hydraulic type. Coil over style only.
AFCO 21 Series, Pro AC Series, QAI 62 Series all nonadjustable shocks. Are the only shocks allowed. Truck owner is responsible for reassembling shocks after tech.
The only part that can be changed is the shims for compression and rebound.
Shock components must match for that make and model.
Rear suspension must be solid mounts no rubber bushings. No lift bar, 5th coil, stabilizer bars & no rubber loaded suspension parts.
Sway Bars and Spindles:SPLINE BARS ALLOWED;Spindles can be one, two, or three-piece design. All spindle uprights must be steel.
OEM style or aftermarket calipers, 4 piston max., maximum retail price of $200 per caliper.
Maximum retail price of $150.00 per hub (corner)
No Oil filled hubs of any kind
No aluminum upper or lower control arms, (aluminum shaft is OK).
No bump stops, rebound stops, or spring preloading devices on any part of suspension.
Engines & Drive Train:
STOCK Chevy 602 engine is the engine of choice with no modifications allowed. Part number is 19258602. This engine is also known as the CT 350.
Although not mandatory, it is in the best interest of the truck owner and our recommendation that all 602 crate engines be broken in, dyno’d and sealed at Wegner Automotive Research.
Minor repairs only are allowed, and must be performed at Wegner and approved with The Midwest Truck Series. Engines with the IMCA seals are allowed.
Wegner Automotive Research will have a complete list of seals and engine ID numbers and will be on file with Tech Inspector. Crate motors may be impounded for dyno testing. If power ratings are found out of manufacturer’s specifications and tolerances you will be disqualified and your motor will be confiscated. At any time an engine maybe opened up for inspection and if found in compliance to the rules resealed with one of the Midwest Truck Seals or if anything is done at Wegner Automotive it must be sealed by them and recorded to series officials. Including Pans. All trucks will use a rev. limit of 6000 RPMS.
Engines must be located so that the furthest forward spark plug hole is no more than 2 1/2” behind the front axle centerline. Crankshaft centerline must be 11” minimum to ground, front and back.
Must use Holley 650 CFM HP P/N 80541.
All Carburetors must pass all dimension tool specs.
Standard boosters only and must be tightly mounted.
Safety wiring of boosters recommended.
No vacuum leaks.
No modifications allowed.
1” max. carb spacer plate allowed, (1 ¼ “ including gaskets).
Must use single or multi-bore, straight bore spacer, no tapered spacers.
No turtles or other induction performance enhancing devices.
Two (2) returns spring mandatory.
An over-center throttle stop is recommended.
Headers allowed on all engines maximum retail value $400.
Headers may not be coated and must remain as shipped from supplier.
No custom or homemade headers allowed.
No 180° Headers
No stainless steel.Exhaust must exit behind driver either under truck or through the right side door.
Exhaust end must be braced flush to door panel in a way to prevent it becoming a tire cutting hazard.
No Tri-Y or Merge Collector type exhaust allowed.
Mufflers are mandatory. Maximum of 2 mufflers allowed.
All Trucks must meet noise requirements of 95 db, no exceptions.
Kill switch must be clearly labeled, within driver’s reach and easily accessible from either side.
Maximum 12-volt electrical system with one battery only.
Battery must be securely mounted outside the driver’s compartment.
All trucks must be capable of starting under their own power.
All trucks must run a GM HEI non billet distributor, may lock vacuum advance.
A soft touch rev. limiter MSD #8728 must be installed with 6000 rpm chip. Must be mounted out of the Drivers reach.
Any type of transmission may be used. Must be self- starting and must have a reverse gear. No drop out or lightened transmissions may be used. 7 ¼ minimum clutch only. No carbon fiber clutches allowed. All clutch components must be made of magnetic steel including flywheel. Must use a bell housing and must have an opening to check clutch and components. Must use a minimum O.D. 2 ½” steel driveshaft. Driveshaft must have 2 safety hoops, one front and one rear. Clutch-less transmissions may be used with a 25 pound weight penalty.
Must have at least two forward gears and one reverse, plus a neutral position. With engine running and truck in still position, must be able to engage truck in gear and move forward, then backward. OEM production type transmissions recommended. Aftermarket transmissions (Bert, Brinn, Falcon) allowed. (2-speed, 3-speed, 4-speed). No 5-speed or more transmissions, No ‘in and ‘out boxes allowed.
All plugs must be safety wired. $100 fine for oiling up the track.
Weights: Base weight 2700 pounds.
WEIGHT RULE – Maximum Left Side Weight 60% Period. 60.1 will not be tolerated and disqualified. All weights include driver in driver's position and steering wheel on. No tungsten, lead shot, ball bearing type, or liquid type allowed. No moving
weight or weight moving devices allowed. Ballast must be painted white and lettered with truck number. Any loss of weight from any truck for any reason will result in a cash fine of $5 per pound.
MINIMUM WEIGHTS: This Means before all Events (1lbs a lap after the race)
25# for GM brake calipers
Weight penalty add 25# for internally clutched transmission
2019 no weight penalty for internally clutched transmission
2019 block starters will be mandatory and engines should be as shipped from GM
Rear ends must be passenger, light truck (1/2 ton or less) or quick change. Quick change must have minimum ring gear diameter of 10”. Iron or steel carriers and housings on passenger and light truck rear ends. No aluminum or lightweight axle tubes. No titanium or other exotic metal allowed in rear end. All shafts and gears must be magnetic steel.
Rear ends must be locked (recommend spool lock).
No traction control devices or traction compensating differentials.
Full floater rear end is mandatory. All floater parts must be steel with the exception of the drive flange.
No gun drilled axles. Minimum diameter 1.170 inches at smallest point.
No cambered rear tubes, snouts etc. as to cause rear camber.
No strange type axles allowed.
Radiator must be in front of engine and must retain stock appearance.
All trucks using engine mounted fans must have minimum 18-gauge fan protection covering upper 180 degrees of fan.
Minimum 1 quart overflow container required.
No radiator or fan shrouds protruding through hood.
No cooling system components inside of driver’s compartment.
Electric fans allowed.
NO ANTI-FREEZE ALLOWED!!!
Fuel and Fuel Cell:
No oxygen bearing fuel or performance enhancing additives may be used.
Violations will result in immediate disqualification from the event; forfeiture of owner and driver points, and monies/contingencies earned for the event.
A series fuel will be determined and its purchase at the track will be mandatory at all events.
Fuel cells with rubber bladders and fuel cell plates or fuel cell tubs are mandatory.
Fuel cell protector plate is1/8” min. thickness steel, and must be mounted on outside of frame rails. The plates must cover the sides and rear of the fuel cell and be official approved.
Fuel cell minimum height is 10”.
Fuel cell must be banded both ways with two steel straps each way, 1” minimum straps. Fuel cell tub must use minimum of 1/8” thick steel with one-inch lip. Front, bottom and rear will be one piece. The top of the box will use current 18 or 20-gauge top with 1” by 1/8” steel straps with two in each direction. All fuel cell cans must be magnetic steel.
All fuel cells must have check balls in place.
Any chassis with incorrect fuel cell will be asked to change or be disqualified. No part of fuel cell, straps, plates, can, may be any other material than magnetic steel. If any part of fuel cell does not meet rules the truck will not be able to compete until fixed. NO EXCEPTIONS!
NO COLD AIR INDUCTION AIR BOXES. TWO PIECE 14 inch O.D. AIR CLEANER COVERS ONLY. Maximum air cleaner height of 4” and be open on all 360 degrees. Air cleaner element may not be altered, sprayed or soaked with chemicals or any foreign substance. Maximum MSRP price complete air cleaner assembly $100.00
Wheels and Tires;
10” maximum width steel wheel.
All wheels must be full racing design.
No wheel bleeders or bead locks allowed. Solid steel lug nuts required.
5/8” solid steel studs must be installed with correct press fit. No welding of studs. Stud length must be at least flush with outside edge of lug nut.
Wheel mounting surface must be a minimum 7” diameter, full face, steel hub or use a minimum 7”diameter x 3/16” formed steel or 7”x 1/4” flat steel, full faced support plate or spacer.
No multiple spacers or plates. No spacer thickness more than 1/4”. Minimum diameter for any spacer is 7”. Spacers must be magnetic steel.
The Midwest Truck Series will utilize the Hoosier (F 80) series tires. All tires will be bought from John Wood. Tire rules will be listed below or on an event flyer as soon as possible. This will be a one (new) tire per show series.
Any Safety infraction will deem the Truck ineligible for competition until the infraction has been repaired or corrected and the Truck re-inspected. In all matters pertaining to safety, truck owners, drivers and crew members must review and educate themselves in all safety standards. It is the responsibility of the truck owners, drivers and crew members to install, wear and maintain all safety equipment as specified by manufacturer’s instructions. This includes, but is not limited to, helmets, fires suits, racing suits, gloves, shoes, flame-resistant underwear, flame-resistant head sock, head and neck restraint systems, driver’s racing seat and safety belts. Drivers wearing dental plates or dentures are required to remove them for any hot-track activity.
All driver seats must be multi-layer aluminum, and manufactured by a recognized manufacturer of seat and safety equipment. Seats must remain “as purchased and produced”, no holes or other modifications made for weight reduction. Homemade seats or sprint truck type seats are not permitted.
Seat construction must be solid aluminum sheet material from the seat bottom to above the driver shoulder area; must be fully padded, with padded pelvis, rib and shoulder supports on both the left and right side. Exception – LaJoie seat where construction is such that rib supports are not required. A head restraint system, manufactured by a recognized manufacturer of seat and safety equipment, is mandatory and subject to official’s approval. Bolt on systems are approved for competition.
Seats must be equipped with left and right leg extensions, fully padded, running from the edge of the seat to the entrance of the foot box area. Recommendation – a minimum 1/8” (.125-inch) thick steel plate be mounted on the front of backside of the rear hoop of the mid-section in front of the left rear wheel. Plate should extend from the horizontal shoulder bar downward the height and width of the driver seat.
Drivers Apparel, Seat Belts and Head and Neck Devices;
All seat belt and shoulder harness systems must me SFI Specification 16.1, type 1. Y-type shoulder belts are not approved for use. Seat belts and shoulder harness systems must have a production date within three years of the event date. A minimum five-point harness system is mandatory. Competitors must use the (recommended H&N Devices) HANS Device or Hybrid SFI 38:1 certified head restraints may use a standard three-inch (3”) or the Schroth Racing or Simpson Racing Products two inch (2”) wide shoulder strap. The Schroth Racing shoulder strap system has been specifically designed for use with the HANS Device. Schroth part numbers are Profi III-6FH; Hyb
Helmet will be Snell Rated SA 2010 or newer.
Mandatory, and must be located 150” towards rear from front edge of nosepiece.
Raceceviers are mandatory for at least one person on crew.
Non - compliance with the specifications outlined herein may subject the participants (owner/driver) to disqualification, loss of monies and points earned at the event. Furthermore, the owner may be fined up to $1000 and all non-complying components will be seized by the series technical inspector. Owner/driver must provide tools to remove part(s).
Any engine at any time may be disassembled, opened, checked, or removed by series officials and resealed with series seals. Failure to do so in a reasonable amount of time will result in Disqualification/Fines/Removal of Truck Series Membership or all/any of the. It is up to your team to provide tools and equipment to do so.
These Rules are property of The Midwest Truck Series and may not be used without Series Office Approval.