IAMO 3,800lbs Pro Street Two Wheel Drive Rules May 14, 2009 04:01AM
The following are the rules for IAMO Truck and Tractor Pullers 3,800lbs Pro Street Two Wheel Drive Trucks. There has been some difficulty adding them to the website, but that should be fixed soon.

IAMO Truck and Tractor Pullers
3800 lbs. Pro Street
Two Wheel Drive Trucks


General Purpose

This proposed class is intended to be an introductory class to the sport of Two Wheel Drive Truck Pulling. Several limitations are included in the following rules in an attempt to lower the amount of initial input which is needed for a new pulling team and their truck to reach the track.

Weight

1. 3,800 lbs

Engine

2. Engine designs are limited to “small block” configurations only. OEM production blocks only. Must have OEM casting numbers. No Bowtie, FRPP/Ford Motorsports, Direct Connection, or other aftermarket blocks allowed.
3. 366 cubic inch maximum displacement. No tolerance.
4. MSD 6AL with Rev Limiter required. No Options. Unit must be mounted in the engine bay on passenger side firewall with rev limit chip facing up. Engines will be limited to 7000 rpm.
5. Camshafts must be solid or hydraulic flat tappet. No roller camshafts allowed. No roller lifters.
6. Cast Iron Cylinder heads only.
7. Cast Iron or cast aluminum Intake manifolds only.
8. One (1) four barrel naturally aspirated carburetor, 4150 style, 850 CFM maximum with factory part number on choke housing. Choke housing must remain stock. Only carburetor allowed is square flanged. Numbers must not be altered. All air must enter through the ventura. Carburetor “Go/No Go” tool must not exceed below factory casting ring in non modified ventura. Tool must not enter bottom base plate. All other alterations acceptable.
9. Engine exhaust must exit vertically or downward and straight back.

Driveline

1. One ton OEM manual transmission maximum, no aftermarket, no cut gears allowed.
2. Manual Clutch must be contained in factory depth bell housing. Dual disc clutches are permitted. No centrifugal or crower glide style clutches allowed.
3. Steel flywheel, bell housing, block saver plates are required. NO cast iron flywheels or bell housings are allowed.
4. One ton automatic transmission maximum. No cut gears. OEM 4x4 transfer case allowed.
5. Automatics may run stall converter.
6. Automatics must have SFI approved shielding or SFI blanket covering converter and planetaries.
7. One ton rear differential maximum.

Frame

1. All trucks must be compact style mini truck, S10, Ranger, D50, Comanche, etc. No midsize. Any brand of engine allowed in any body.
2. Factory frame only. May be reinforced front to back. NO adding to the length of the frame.
3. Maximum wheelbase 109-1/4”
4. Maximum length 153 inches measured from the center of the rear axle to front of the weights.
5. Rear weights must stay inside of bed.

Hitch

1. Hitch distance 39-1/4 inches minimum measured from the center of the rear axle to the hook point.
2. Hitch must be stationary in all directions.
3. Maximum hitch height is 24 inches.
4. Drawbar must be straight from the anchor point to hook point.
5. Hitch anchor point can be no higher than 36 inches off the ground.
6. Anchor pinhole will be 7/8” minimum.
7. Hook point hole will be no less than 3.5 inches from front to back and no less than 3 inches side to side. 1” minimum from edge to the hook point.

Tires

1. D.O.T. tires only. Unaltered tread pattern.
2. Maximum tire size 31x10.50
3. Maximum rim width 10 inches





Body

1. Factory OEM body, any OEM or aftermarket hood. Above hood air cleaner must be covered by non-functional scoop or hood enclosure.
2. Firewall must remain and in original position.
3. Driver’s seat must remain in original stock location
4. NO fuel lines or tanks allowed in driver’s compartment
5. Battery must be in engine compartment or bed area
6. Top of bed must be covered if bed is cut out.
7. All factory OEM glass. NO Lexan or Plexiglas

Fuel

1. Gasoline is the only acceptable fuel.
2. NO oxygen carriers or combustion accelerators permitted.

Safety

1. All 2 wheel drive trucks will use wheelie bars. The bars will extend behind the rear tire and be a maximum of 10 inches off the ground with a 5 inch square pad. NO rolling wheels or moving devices of any kind on stabilizer bars.
2. Must have kill switch for electric fuel pump and ignition mounted to the right side of hitch. Reverse lights in factory location or above the hitch.
3. Must have a fire extinguisher in cab within arms reach.
4. Safety belts are required. OEM or 4 point harness minimum.
5. SFI approved engine balancer. OEM balancer must have 360 degree shielding.
6. Steel Flywheel and safety bell housing and block saver plates required.
7. Automatics SFI Approved transmission shield and SFI Blanket covering converter and planetary.
8. Engine driven cooling fans shielded 360 degrees around fan.
9. Shields are required for side of block from base of head to the top of the frame.
10. Firewall and cab floor must have all unused holes patched or plugged.
11. Shields around u-joints and driveline every three feet. 6” long, 2” maximum spacing around u-joint, shield thickness 3/8” aluminum, 5/16” steel. Vehicles must have driveshaft loops every three (feet). Driveshaft must be round and 1/8” thick. All vehicles must have universal joint covers (360 degrees). 6” long centered on joint.
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