Tech

 

Rule changes from the December 13 & 15, 2024 ITPA Board of Directors meetings.
General rules
All turbocharged vehicles are required to have a turbocharger containment blanket.  On multiple charger vehicles, the containment blanket is only required on the pressure stage (bottom) turbocharger.

All competitors must show proof of liability insurance on their support/tow vehicles annually.  This will be done at time of certification.

Light Modified
Official weights for 2025 will be:  Allison weigh 5600 lbs. – Blown automotive engines weigh 6000 lbs. – Turbines weigh 6200 lbs.

Heavy Modified
Add rule K. to rule #4 on page 29 under Modified Tractors.
K.  Allow one motor combination of one Allison aircraft (V-12) plus one non-hemi V8 automotive engine, maximum 650 CID with 14-71 roots supercharger with no overdrive limit.

Pro Stock
Rule #3 on page 33 under Pro Stock Tractors, delete:  and/or intercooler

Change rule #5 on page 33 under Pro Stock Tractors to read:
5.  Pro Stock block not to exceed 1″ total increase to OEM deck height measured from centerline of crankshaft to cylinder head surface including any gaskets and/or spacers used.  No tolerance to block specs allowed.

Change the last part of rule #6 on page 33 under Pro Stock Tractors to read:
6.  Steel blocks allowed, no aluminum.  Aftermarket cast iron blocks allowed, no aluminum.  Block must accept OEM crankshaft.  Block must have head bolts that remain in OEM location.  Camshaft must be in OEM location.  Use of illegal block will result in a life time suspension.

2WD Trucks
Add rule #34 on page 40 under Two Wheel Drive Trucks to read:
34.  Top drawbar adjuster bolt must be cross drilled to accommodate a .125″ zip-tie or seal to a rigid bracket.

Mini Rods
Add to rule #9-B on page 35 under Mini Rod Tractors: after Roots type: maximum rotor length 15″

11,000# Pro Farm
Change part of rule #4 on page 43 under 11,000# Pro Farm to read:
466 cubic inch or less vehicles allowed to run a maximum of 3500 engine RPM’s.

9500# Limited Pro Stock
Starting in the 2026 competing year, the 9500# Limited Pro Stock class will have a box turbocharger from Wimer.

Rule changes from the November 3, 2024 ITPA Board of Directors meeting.
Purse payout for 2025:
Light Modified – Light Super Stock – Super Stock Diesel Trucks – 8500# Limited Pro Stock – 4WD Trucks
$3100 per class minimum – $40 entry fee

2WD Trucks – 9500# Limited Pro Stock
$3400 per class minimum – $45 entry fee

Heavy Modified
$5200 per class minimum – $50 entry fee

Heavy Super Stock
$3700 per class minimum – $40 entry fee

Pro Stock
$4400 per class minimum – $60 entry fee

Mini Rod
$1800 per class minimum – $30 entry fee

Antique – Classic – 1050# Super Stock
$1000 per class minimum – $20 entry fee

10,500# Farm Stock
$1600 per class minimum – $20 entry fee

6850# Pro Farm – 9500# Pro Farm – 11,000# Pro Farm
$1900 per class minimum – $30 entry fee

Promoter Insurance:
$900 for first session, second or third sessions – $450

6850# Pro Farm
Precision turbocharger will be the box turbocharger used in the 6850# Pro Farm class.

 

Rule changes from the March 10, 2024 ITPA Board of Directors meeting.
Turbocharger Exhaust Containment
Change rule #2 on page 18 under EXHAUST SYSTEMS to read:
2.  All turbocharged engines must have a star containment ring/devise installed in the V band area PLUS two (2) 1/2″ Grade 5 bolts in horizontal portion of exhaust pipe(s), must be installed in cross pattern 90 degrees to each other, within one (1) inch of each other, as close to turbine exhaust wheel as possible OR the cross bolts in turbo exhaust housing, installed by turbo manufacturer.

In rule #14 on page 22 under SAFETY, delete “ahead of engine”, rule will now read:
14.  All vehicles carrying onboard batteries must have quick disconnect method.  Switch to be located in a visible location.

On page 31, rule #25 under SUPER STOCK TRACTORS, delete the last sentence which reads:  “Diesel Super Stock and 9500# Limited Pro Stock vehicles may run in the Pro Stock class weighing 10,000 lbs.”

On page 38, rule #6 under TWO WHEEL DRIVE TRUCKS, change to read:
6.  Vehicles have the option of not having front windshield and/or rear glass installed in their vehicle for safety reasons.  Factory tint is acceptable.  Stained or smoked glass is not allowed on any windows.  Tinted windows that impair track officials view of driver’s compartment is unacceptable.

 

 

Rule changes from the January 7, 2024 ITPA Board of Directors meeting.

The wording was changed on the rule passed at the December 10, 2023 meeting (Page 22, rule #14 under Safety) to read:
14.  All vehicles carrying onboard batteries must have quick disconnect method.  Switch to be located in a visible location ahead of the engine. The word “start” was deleted from the previous rule.

10,500# Farm Stock class was added for 2024 with $1600 purse and $20 entry fee.

 

Rule changes from the December 10, 2023 ITPA Board of Directors meeting.
Safety
Page 22, rule #14 under Safety, change to read:
14.  All vehicles carrying onboard start batteries must have quick disconnect method.  Switch to be located in a visible location ahead of the engine.

Page 22 under Safety, add rule #17 to read:
17.  No visible illumination (white or colored) on the vehicle shall be visible to the track officials while the vehicle is hooked to the sled.  Exception will be reverse, neutral safety and back up lights.  Indicator lights on the dash that are visible to the operator only will be allowed.

Light Super Stock

Page 30, rule #11 under Super Stock Tractors, change 6400# to 6600# for ag chassis vehicles and diesel component vehicles.  Vehicles with 436 cubic inches or less allowed to weigh 6600 lbs.

Pro Stock

Page 33, rule #1 under Pro Stock Tractors, change to read:
1.  The only turbocharger allowed will be a 5 inch Wimer box turbocharger with no modification.  In case of a protest, turbocharger will be sent to Wimer for inspection and if found modified, competitor will receive a life time suspension.  No intercoolers allowed.

Page 33, rule #6 under Pro Stock Tractors, add the following:
Block must accept OEM crankshaft.  Block must have head bolts that remain in OEM location.Camshaft must be in OEM location.

4WD Trucks

Page 27, under Four Wheel Drive Trucks, change to read:
1.  Maximum tire size to be 114 inch circumference and inflated to 30 psi. with original bar not to exceed 20 inches in width.

1050# Super Stock

Page 48, rule #8 under 1050# Super Stock, add F. to read:
F.  No adjustable frontend suspension, i.e. air, spring, etc.

Pro Stock Diesel Trucks

Change the Pro Stock Diesel Truck division to Super Stock Diesel Trucks and adopt PPL rules.  Trucks with 3.0 on smaller turbochargers allowed to weigh 7800 lbs.

9500# Pro Farm

Page 45, rule #3 under 9500# Pro Farm, change to read:
3.  Maximum of 3400 engine RPM’s before pull, after pull and/or during competition.

Page 45, rule #4 under 9500# Pro Farm, change to read:
4.  No intercoolers allowed.  No aftercoolers allowed.  Water injection allowed (no windshield washer fluid, alcohol, etc. allowed as a cooling agent) with shifting allowed.

6850# Pro Farm

For the 2025 pulling season, the turbocharger to be used in the 6850# Pro Farm division will be a Borg-Warner S366SXE box turbocharger.

Light Modified

Change the weight allowed on blown Hemi automotive powered vehicles from 5800 lbs. to 6000 lbs.
Change the weight allowed on Allison engine powered vehicles from 5600 lbs. to 5700 lbs. (Correction, sorry for the error)
Blown wedge-type automotive engine allowed to run any head.

Rule changes from the December 8, 2023 ITPA Board of Directors meeting.

Clutches, Flywheels and Automatics
Change rule #21 on page 12 under Clutches, Flywheel and Automatics to read:
21.  All bellhousings regardless of material i.e. steel, titanium or aluminum must display a legible SFI sticker affixed by the manufacturer.  No modifications allowed.

Rule changes from the November 5, 2023 ITPA Board of Directors meeting.

Summary of Causes for Disqualification
Rule #8 on page 56 changed to read:
8.  No consumption of alcoholic beverages before or during pull.  Any competitor or any of his crew incapacitated due to intoxicating agent, and/or drugs, his or her pulling vehicle will not compete for duration of pull.

Heavy Modified Class
Rules for the present Heavy Modified class were changed to Outlaw Truck & Tractor Pulling Association Modified rules.  Weight will be 7400# with a minimum purse payout of $5,200, 1st – $1200, 2nd – $1000, 3rd – $900, 4th – $800, 5th – $700, 6th – $600.

Rule changes from the December 11, 2022 ITPA Board of Directors meeting.
All ITPA classes:  Drawbar must be painted white or contrasting color of vehicle.

Light Super Stock – Vehicles with 436 cubic inches or less allowed to weigh 6400 lbs.

Mini Rods – Weight increased from 1950 lbs. to 2000 lbs.

Pro Stock – In 2024, the only turbocharger allowed will be a 5 inch Wimer box turbocharger.  No intercoolers allowed.

8500# Limited Pro Stock – Change rule #4 on page 34 under 8500# Limited Pro Stock to read:  Engine head must be OEM width, height and length dimensions agricultural-type for that brand engine with valves, port location and injection tip in OEM location.  Intake manifold mounting surface must be 90 degrees to cylinder head/block mounting surface.  Recast heads allowed.  No billet heads allowed.

4WD Trucks – 4WD Trucks with engine less than 600 cubic inches will be allowed to weigh 6500 lbs.

9500# & 11,000# Pro Farm – Aftermarket intake/exhaust manifolds allowed.
                                                          
11,000# Pro Farm (only) – Recast pumps allowed for V8 engines only.
Engine head must be OEM width, height and length dimensions agricultural-type for that brand engine with valves, port location and injection tip in OEM location.  Intake manifold mounting surface must be 90 degrees to cylinder head/block mounting surface.  Recast heads allowed.  No billet heads allowed.

Rule changes from the November 6, 2022 ITPA Board of Directors meeting.
Prize money for 2023 was increased slightly.
1050# Super Stock, Antique and Classic – $100 increase
All other ITPA classes – $200 increase

Rim widths (for measuring tire widths) were deleted for all classes.
Page 26 under TIRES, in rule #1 under MODIFIED AND SUPER STOCK TRACTORS, delete “on a 28 inch wide rim”.  Page 27 under PRO STOCK AND LIMITED PRO STOCK TRACTORS, in rule #1, delete “on a 26 inch wide rim”.  Under FOUR WHEEL DRIVE TRUCKS, in rule #1 delete “on an 18-inch rim”.  Under TWO WHEEL DRIVE TRUCKS, in rule #1, delete “when mounted on an 18 inch rim”.  Page 33 under PRO STOCK TRACTORS, in rule #4, delete “on a 26 inch wide rim”.  Page 34 under 9500# LIMITED PRO STOCK, in rule #3, delete “on a 26 inch wide rim”.  Page 34 under 8500# LIMITED PRO STOCK, in rule #6, delete “on a 26 inch wide rim”.

For the 2024 pulling season, all SFI bellhousings regardless of material i.e. steel, titanium or aluminum must display current SFI sticker with an expiration date affixed by the manufacture.

Rule changes from the March 6, 2022 ITPA Board of Directors meeting.
Rule change applies to all turbocharged engines.
Super Stock Tractors
Page 30 under SUPER STOCK TRACTORS:  rule #12 changed to read:
All turbocharged engines are required to have two (2) 3/8″ cables with a minimum of 4 clamps at the splice or crimps with a coupler on each side.  One cable to be placed between first and second cylinder through exhaust manifold port area.  Second cable around the engine anywhere in the front half of engine.  Both cables circle the entire head/block assembly with a maximum of 4″ slack.
OR
A cable must be minimum of one (1) 3/8″ manufactured pendant line with a rating of at least 3000 lbs. or more with a tag from manufacture that indicates rated load capacity with swaged sockets.  Placed between first and second cylinder through exhaust manifold port area.

Same rule to be added on page 16 under ENGINES as rule $18.
Same rule to replace rule #32 on page 50 under PRO STOCK DIESEL TRUCKS.

Rule changes from the December 12, 2021 ITPA Board of Directors meeting.
Classic
Page 41 rule #9 – add:  Classic division only:  Adapter plate allowed between carburetor and intake manifold with a maximum thickness of .455 inches including gaskets.

Head update:  Oliver 88 tractors allowed to run the Oliver 99 (9 port) head – part #195002.

Heavy Super Stock
Page 30 rule #11 – Change weight on the diesel vehicles to a maximum of 8,900 pounds.  (Diesel tractors will now be allowed to weigh 8900 lbs. in the Heavy Super Stock class.)

Light Super Stock
Page 30 rule #11 – Change to read:  6200# – component chassis alcohol vehicles
                                                            6400# – ag chassis vehicles and diesel component vehicles

11,000# Pro Farm
Page 43 rule #4 – Delete:  Vehicles with maximum size 14 millimeter plungers allowed to run water injection.  Vehicles with maximum size 16 millimeter plungers are not allowed to run water injection.  Maximum plunger size allowed is 16 millimeter.
Add:  Maximum plunger size allowed is 16 millimeters, water injection allowed.

Page 42 rule #2 – Add:  466 cubic inch or less vehicles allowed to run a maximum of 3400 engine RPM’s.

Class name changes:
5800# Modified – Light Modified
8000# Modified – Heavy Modified
6000# Super Stock – Light Super Stock
8200# Super Stock – Heavy Super Stock
10,000# Pro Stock – Pro Stock
6200# 2WD Truck – 2WD Truck
6350# 4WD Truck – 4WD Truck
7800# Pro Stock Diesel Trucks – Pro Stock Diesel Trucks
1950# Mini Rod – Mini Rod
5500# Antique – Antique
5500# Classic – Classic
All other class names remain the same.

8000# Pro-Street Diesel Trucks
ITPA will no longer offer the 8000# Pro Street Diesel Truck class.

Rule changes from the October 3, 2021 ITPA Board of Directors meeting.
Helmets
Page 21 rule #3 under SAFETY:  All helmets must meet or exceed Snell 2010 rating or must be SFI SPEC 41.2.  Previous Snell rating was 2000.

Rule changes from the January 17, 2021 ITPA Board of Directors meeting.
Exhaust Systems
Page 17 rule #2 under EXHAUST SYSTEMS:  change to read:  Turbocharged engines must have two (2) 1/2 inch grade 5 only bolts in vertical/horizontal portion of exhaust pipe(s) must be installed in a cross pattern as close to turbine exhaust wheel as possible.  Bolts to be installed 90 degrees to each other, within one (1) inch of each other.

9500# Limited Pro Stock
Add under the title:  Super Stock and 9500# Limited Pro Stock rules read the same except the following which apply to 9500# Limited Pro Stock only.
Rule #4 – No component chassis. – to stay as is.
Rule # 11 – deleted

8500# Limited Pro Stock
Add under the title:  Super Stock and 8500# Limited Pro Stock rules read the same except the following which apply to 8500# Limited Pro Stock only.
Change rule #11 to read:  11.  No component chassis.

8000# Pro-Street Diesel Trucks
Due to the low number of Pro-Street Diesel Truck competitors, that division will not be offered in 2021 and these competitors will be allowed to compete in the 7800# Pro Stock Diesel Truck class weighing 8000 lbs. with their present class rule restrictions.

Rule changes from the March 1, 2020 ITPA Board of Directors meeting.
Driveline Shielding (this applies to all divisions except Antique and Classic)
The following rule applies to all divisions that use solid driveline shields over 16 inches in length (Note:  this also applies to Mini Rod division and the intermediate shaft on FWD trucks):  All driveline shield components must be tethered on each end by two opposing restraints.  Tethers must attach at 180 degrees of each other and a minimum of 3″ and a maximum of 6″ from each end of each driveline shield component.
Tether to be constructed of a minimum of 2″ wide by 1/8″ thick nylon or polyester strap.  One end of tether must attach to one side of the chassis, then go around the driveline shield, then attach to the other side of the chassis.  Tether must be attached to chassis by a minimum of one 3/8″ grade 5 bolt with a grommet on each side or wrap around the chassis and use a buckle to fasten it to itself.
Note:  FWD drivelines that use driveshaft hoops must use same tether configuration to be attached to main or common hoop holder between chassis and hoop assembly.

Pro Stock
The rule passed in December 2019 regarding Pro Stock turbocharger proposal for the 2021 pulling season was amended to read:  Proposed for 2021, Pro Stock turbocharger will be a 5.7″, smooth bore, box turbocharger.

Rule changes from the January 5, 2020 ITPA Board of Directors meeting.
General Rules (this applies to all divisions)
Add rule #4 on page 6 under GENERAL RULES, Brakes to read (changed from December meeting):
Maximum one master cylinder (pressure source), per wheel supplying each caliper(s) though a single supply line (must be visible).  May be multiple piston/puck design caliper(s).  No electronic or computer controlled line lock or proportioning valves of any type, whether in line or internal, allowed.  Applies to drivetrain brakes as well as wheel brakes.  Manual residual pressure valve will be allowed before brake caliper(s).

Antique and Classic
Change the first sentence in rule #2 on page 39 under ANTIQUE AND CLASSIC to read:  Tractors should be restored to as near original as possible with original hood, original radiator and original appearing fuel tank.

Rule changes from the December 15, 2019 ITPA Board of Directors meeting.
Antique
Page 39 under Antique and Classic, change the first sentence in rule #3 to read:  Antique:  Tractor must have OEM external dimensions cast iron block and crankcase (updated OEM crankcase, block and head(s) allowed).

Carburetor rule and fuel tank rule (original and replacement) stays the same as in 2019.

Classic
Carburetor rule stays the same as in 2019.

General Rules (this applies to all divisions)
Add rule #4 on page 6 to read:  Maximum one master cylinder (pressure source), per wheel supplying each caliper(s) through a single supply line.  May be multiple piston/puck design caliper(s).

Fuel and Fuel Containers
On page 18 under Fuel and Fuel Containers, change to read:  Diesel Fuel to be used in ITPA competition shall have a dielectric value no greater than 150 nor a value of no less than 30.

Super Stock
Diesel tractors in the 8200# Super Stock class will now weigh a maximum of 8750 lbs.

Removed the 200 lbs. moveable weight in both the 6000# and 8200# Super Stock divisions.

Pro Stock
Proposed for 2021, Pro Stock turbocharger will be a 5.5 inch box turbocharger.

8500# Limited Pro Stock
No billet heads allowed was addressed at the October meeting.

Allowed the Detroit series 40 engine to replace the AC 426 engine in the 8500# Limited Pro Stock class.

4WD Trucks
Change the first sentence in rule #8 on page 35 under Four Wheel Drive Trucks under Body/Chassis to read:  Vehicles have the option of not having front windshield and/or rear glass installed in their vehicle for safety reasons.

Pro-Street Diesel Trucks
Page 52 under Hitch, add:  Drawbar height adjusters must be below hooking point.  Hold down above drawbar will be allowed.

Page 51 under Cooling System, change to read:  Radiators are optional but if used must remain in stock location.  Dry block will be allowed.

9500# & 11,000# Pro Farm
Page 41, in rule #2 under 11,000# Pro Farm add:  No aftermarket, recast and billet blocks or heads allowed.

Page 42, in rule #4 under 11,000# Pro Farm, delete:  No hood modification allowed.

Discussed water injection being allowed with 16 millimeter plunger size.  No action taken.  Rule remains the same as in 2019.

Page 42, in rule #4 under 11,000# Pro Farm change to read:  (9500# Pro Farm only:  Maximum plunger size is 13 millimeter plungers.)

5800# Modified
Purse payout was change from 10 to 8.

Rule changes from the October 6, 2019 ITPA Board of Directors meeting:
General Rules
Change rule #3 on page 7 under GENERAL RULES to read:
3.  Drawbar must be rigid, with no movement allowed.  Drawbars must have the pivot pin on the same plane as the hitch point and parallel to the ground within 15 degrees or less of drawbar angle in either direction when measured at maximum drawbar height per class.  Drawbars must be parallel to the ground , with the exception of 4WD Trucks.

Pro Stock and Limited Pro Stock Tractors
Change rule #1 on page 26 under PRO STOCK AND LIMITED PRO STOCK TRACTORS  to read:  1.  Only tire size allowed for competition:  24.5 x 32 with a maximum of 210 inch circumference, when inflated to 10 psi. on a 26 inch wide rim.  Tread width not to exceed 25 inches.  No radial tires allowed.
Change rule #4 on page 32 under PRO STOCK TRACTORS to read:  same as above
Change rule #3 on page 32 under 9500# LIMITED PRO STOCK to read:  same as above
Change rule #6 on page 33 under 8500# LIMITED PRO STOCK to read:  same as above

8500# Limited Pro Stock Tractors
Change rule #4 on page 33 to read:  Engine head must be OEM agricultural-type for that brand engine with valves and injection tip to be OEM location.  No recast for billet heads allowed.

Rule changes from the March 10, 2019 ITPA Board of Directors meeting:
9500# Limited Pro Stock
Change rule #6 on page 32 to read:  No overhead cams permitted.  Outside of cylinder head must keep OEM length and width dimensions.  Must retain a single intake/exhaust manifold to the side of cylinder head.  Intake manifold mounting surface must be 90 degrees to cylinder head/block mounting surface.  Maximum of 2 valves per cylinder and OEM valve angle and configuration must be retained.
Delete rule #8 and #9 on page 32.

6850# Pro Farm
Page 45 rule #1, add to #o – v. to read:  T-4 base with 3.1″ exhaust maximum.

5500# Classic
The 6 cylinder Oliver 99 tractor be allowed to run the same engine rpms that were allowed in the past.

Rule changes from the January 6, 2019 ITPA Board of Directors meeting:
1050# Super Stock
Rule #6 on page 21 under SAFETY was changed to read:
“Capable operator must be in the driver seat while vehicle is being started and/or running.  1050# Super Stock operator may exit running vehicle only while hooking to the sled.  This applies to all classes except for Antique vehicles during manual starting procedures.”

7800# Pro Stock Diesel Trucks
Rule #17 on page 49 under PRO STOCK DIESEL TRUCKS was changed to read:
“Engine must remain in stock location.  Forward most part of engine block must not exceed 17″ forward of the centerline of the front axle.  Maximum engine size is 460 cubic inches.  Engines may be changed to cross factory lines of manufacturing (Cummins may be put in a Ford or Chevrolet).  Engine must come in 1 ton or smaller truck.  Engine must be OEM replacement or its replica.  A replica to be considered must retain stock bore spacing and operate with the stock crankshaft for the model without alterations for chassis mounting.  Aftermarket/recasted/billet heads allowed.  Engine side shields required. (see rule #1 under ENGINES).”

By-law changes:
1.  Northern Zone was eliminated due to lack of membership(2).  Southern Zone stays the same.  Western Zone is west of Interstate 55, then west of Interstate 39 and north of Interstate 70.  Eastern Zone is east of Interstate 55, then east of Interstate 39 and north of Interstate 70.
2.  You must be an I.T.P.A. member by August 1 on the current year to be eligible to vote at your zone meeting.
3.  Individuals must be an I.T.P.A. member for two consecutive years before being eligible to be on the I.T.P.A. Board of Directors.

Rule changes from the December 9, 2018 ITPA Board of Directors meeting:
Classic
Any 6 cylinder Oliver 99 tractor allowed a maximum of 2024 engine rpms.

5800# Modified
For the 2019 pulling season:  Allison powered vehicles to weigh 5600#, blown automotive engine vehicles with 8-71 supercharger at 60% maximum overdrive to weigh 5800# and turbine powered vehicles to weigh 6000#.

Blown automotive engine tractors with wedge heads that will accept a stock OEM intake manifold bolt pattern, with 14-71 supercharger at maximum 40% overdrive OR any smaller supercharger at any overdrive will be allowed to weigh 6000#.

Super Stock
Page 29, rule #11 change to read:  In the 8200# Super Stock class, alcohol vehicles weigh a maximum of 8200# and diesel vehicles weigh a maximum of 9000#, both with 200# moveable weight.

9500# Limited Pro Stock
Page 32, rule #6 change to read:  Outside of cylinder head must be OEM length and width dimensions, no more than 1″ taller than OEM height.

Manifold mounting surface must be 90 degrees of cylinder head to block mounting surface.

6850# Pro Farm
Page 44, rule #1 under e. add:  Any competitor running a replacement JD block, engine must be cubic inch checked and sealed prior to competition.  Seal to consist of two side by side pan bolts.

Page 45, rule #1 add p. to read:  No variable valve timing allowed.

Page 44, rule #1 l. add:  No external modifications to cylinder head allowed with the exception of the removal of factory cast intake manifold (i.e. B series Cummins or 361 IH 806 diesel).  If cylinder head is modified by removing the intake, mounting surface(s) must be 90 degrees to the deck mounting surface of the cylinder head.

Page 45 rule #1 add to o. – v. to read:  T-4 base with 3.0″ exhaust maximum.

Rule changes from the November 4, 2018 ITPA Board of Directors meeting:
8000# Modified
The 8000# Modified class to be no points, no State Fair for 2019 pulling season.

Rule changes from the October 7, 2018 ITPA Board of Directors meeting:
General rules under Safety:
Change rule #6 on page 21 to read:  Capable operator must be in the driver seat while vehicle is being started and/or running.  This applies to all classes except for Antique vehicles during manual starting procedures. 

Rule addition for the 8500# Limited Pro Stock division:
Add to the end of rule #4 on page 33 of the 2018 ITPA rule book under 8500# Limited Pro Stock:
Present rule reads:  Engine head must be OEM agricultural-type for that brand engine with valves and injection tip to be OEM location.  add effective July 10, 2018:  “No recast or billet heads allowed.”

Rule changes from the March 4, 2018 ITPA Board of Directors meeting:
11,000# Pro Farm
Change the first sentence in rule #4 on page 42 under 11,000# Pro Farm to read:  Maximum size injection pump is 7100 series P-pump.  No recast or billet pumps allowed.  (9500# Pro Farm class only:  Maximum plunger size allowed is 14 millimeter plungers.)  (11,000# Pro Farm class only:  Vehicles with maximum size 14 millimeter plungers allowed to run water injection.  Vehicles with maximum size 16 millimeter plungers are not allowed to run water injection.  Maximum plunger size allowed is 16 millimeter.)

Rule changes from the January 14, 2018 ITPA Board of Directors meeting:
All Diesel divisions
The rule stating “No ether bottles allowed anywhere on the pulling vehicle.” was rescinded.  The old rule stating “All ether bottles (starting aids) must be placed outside of engine compartment.” was reinstated.

Pro Farm
Allowing water injection in the 11,000# Pro Farm class was discussed, no action taken.  Tire  circumference figures were discussed for both Pro Farm classes, no action taken.

Pro-Street Diesel Trucks
Page 52 under Suspension-Rear:  Delete: “Must have a rear leaf spring in functioning leaf pack.”
Page 51 under Interior:  Delete: “An interior, including dashboard and front door panels is mandatory.”
Page 49 under Body:  Delete the last sentence:  “No cutting or gutting of body is allowed.”

9500# Limited Pro Stock
Page 33 rule #11, add to the end of the rule:  “No recast or billet pumps allowed.”

Northern Zone
A By-Law change was made:  Effective December 7, 2018, the Northern Zone to be eliminated.  The Eastern Zone will be East of Interstate 55, then East of Interstate 39 and North of Interstate 70.  The Western Zone will be West of Interstate 55, then West of Interstate 39 and North of Interstate 70.  No change in the Southern Zone, South of Interstate 70.

Rule changes from the December 10, 2017 ITPA Board of Directors meeting:
Antique
Single barrel updraft agricultural carburetor allowed with a maximum throat opening of 1.8″ for 4 and 6 cylinder tractors only.
Duplex carburetors were discussed, no action taken.
Steel or aluminum replacement fuel tanks allowed.
Electric inline fuel pumps allowed.

Classic
Aluminum wheels were discussed, no action taken.

Antique & Classic
Replacement covers may be made of steel, sheet metal or aluminum (no magnesium, wood, etc. replacement parts).
Electric fan (in OEM location) and electric water pump allowed in both Antique and Classic divisions.

Antique, Classic and all Pro Farm Classes
RPM wiring from pickup to rear plug must be 1 continuous piece, 14 or 16 gauge wire, with a molded female plug of the back end, i.e. molded extension cord type.  RPM monitor wiring must be open for visual inspection.  The 2 wires from the pickup need to be attached to the 2 main spades (not the ground spade) on the female plug.

Mini Rods
Discussed leaving the competition rules the same for 3 years, no action taken.

8500# Limited Pro Stock
No recast or billet pumps allowed.

4WD Trucks
Changed the brake rule to read:  Four wheel drive trucks must have functional brakes on front wheels.
On page 36 under ENGINES add rule #6 to read:  No digital, microprocessor, computer or programmable ignition controls allowed.  No traction control ignition accessories allowed.  No six shooter, power grid systems or similar type ignition controls allowed.

1050# Super Stock
Change the first two sentences on Page 44 rule #1 to read:  Super Stock tractors must be factory made with a maximum wheelbase of 56 inches.
1.  Single cylinder, flathead design with valves located in block.  No overhead valves.
2.  50.5 cubic inches
3.  One intake valve and one exhaust valve.  Both valves to be located entirely on the same side of crankshaft centerline and activated by a single common mechanical camshaft.
Remainder of the rule stays the same.
Change rule #7 on page 45 to read:  Methanol is the only fuel allowed and must be within .003 of specific gravity when temperature corrected.

8000# Pro-Street Diesel Trucks
Tabled changing rules on wheelbase length, leaf springs and cab interior until we get the correct wording from PPL.
Add to intercooler section:  Electric drive fan only will be allowed on air to air intercoolers/aftercoolers.
Change brake rule to read:  Brakes are mandatory on front wheels and must be functional.
Change steering rule to read:  The vehicle may have original OEM steering gearbox OR full electric over hydraulic steering allowed.  Additional stabilizers are permitted,

7800# Pro Stock Diesel Trucks
Change brake rule to read:  Trucks must have working front brakes.

6850# Pro Farm
Added the 6850# Pro Farm class as a sanctioned ITPA class starting in 2018 with a purse of $1600 paying 8 places.

9500# & 11,000# Pro Farm
Add rule #19 on page 44 to read:  During calendar year, if disqualified for exceeding engine RPM limit (or second failure to register RPMs) the disqualification will include loss of all points and prize money at that event.  Second offense will be disqualification for that event plus vehicle suspension for the next two scheduled events for that class.  Third offense will be disqualification for that event, loss of all accumulated points and vehicle suspension for a year and 10 days.
Pump rule clarification:  Maximum size injection pump is 7100 series P-pump with maximum size 14 millimeter plungers.  No recast or billet injection pumps allowed.
Tire size circumference tabled until the January meeting.
The Board granted the Russ Becker variance that the 11,000# Pro Farm class wanted.
RPM checkers were discussed, no action taken.
Water injection was discussed, no action taken.

5800# Modified
Deleted the naturally aspirated automotive engine rule.
Turbine and wedge motors to weigh 6300 lbs.
Maximum supercharger overdrive changed to 60%.

Rule changes from the October 8, 2017 ITPA Board of Directors meeting:
No ether bottles allowed anywhere on the pulling vehicle.
All cubic inch protests must be measured from the top with the head removed.

Rule changes/additions from the March 5, 2017 ITPA Board of Directors meeting:
9500# Limited Pro Stock – in 2018, the weight in the 9500# Limited Pro Stock class will be 9500 lbs. (across the board).

Under Tires:  Change the heading from BIG TRACTORS – EXCEPT PRO STOCK & LIMITED PRO STOCK to:  MODIFIED AND SUPER STOCK TRACTORS and change rule #1 to read:  1.  Maximum tire size allowed for competition:  30.5 x 32 with a maximum of 210 inch circumference, when inflated to 10 psi.  Tread width not to exceed 31 inches.  No radial tires allowed.

 Rule changes/additions from the December 11, 2016 ITPA Board of Directors meeting:
General
Page 19 under SPECIFICATIONS FOR DIESEL FUEL (change to read):  The ITPA will evaluate diesel fuel using the dielectirc constant value.  That value shall be determined by the ITPA fuel check meter only.  The ITPA fuel check meter shall use Cyclohexame to establish the zero reference point for determining all diesel fuel dielectric constant values.  Diesel fuel to be used in ITPA competition shall have a dielectric value of no greater than 100 nor a value of no less than 10.

Change the first part of rule #3 on page #7 under GENERAL RULES/DRAWBARS to read:  Drawbar must be rigid, with no movement allowed.  Drawbars must have the pivot pin on the same plane as the hitch point and parallel to the ground within 10 degrees or less of drawbar angle in either direction when measured at maximum drawbar height per class.

Page 30 rule #12 and page 49 rule #32:  Cable surrounding turbochargerd engines must have 4 clamps (not 2) at the splice.