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              2009 Circuit 4x4 Rules

1.    All Circuit 5500 4x4 trucks must be naturally aspirated with OEM cast iron intake and cast heads and exhaust manifolds, single carburetor or fuel injection. No gas fuel injection. Diesel 4x4 trucks (Chev/Ford/Dodge) must have factory turbo system or factory injectors and factory mechanical pumps only. No water injection allowed. No alcohol is allowed in the fuel system.

2.    Mufflers must be attached.

3.    All General Track Rules will apply.

4.    Hitch point is to be the rearmost point of the truck, rigid in all directions and a maximum of 22 inches from the top of the hitching device to the ground (See General Rules - Vehicles). No part of hitching device to exceed the centre of the rear axle. No hitch angle greater than the angle of the sled chain. Acceptable hitch angle is 0 degrees to a maximum of 28 degrees. Hitch length to be a minimum 34% of the wheelbase.

5.   No air shocks or blocks are allowed to make truck suspension rigid. No stop blocks front or rear.

6.   Circuit 5500 4x4 trucks will weigh no more than 5,500 lb. Added weight may not be mounted forward of stock positioned bumper and/or grill. No weight bars or snowplow harness allowed. Weights must be secure and not in cab.

7.   Stock truck suspension must move. No lateral bars allowed.

8.   Tire size - 31 x 10.5 maximum to include 265/75R16 and stamped DOT approved.

9.   Boxes will be stock in appearance and must have full floor. No complete fiberglass bodies.

10.  Any changes or modifications of rules will be done with the unanimous vote of the class rep and 3 elected tech people from the class with approval of the Executive of GLTTPA. in whole.

11.  No truck may hook in two different divisions at the same event.

12.  All trucks must have working brakes on all four wheels.

13.  Maximum of 526 CID engine size.

14.  All trucks competing in the Circuit 5500 4x4 class must comply with all Circuit 5500 4x4 rules.

15.  No engine driven fans.

Safety Equipment:

1.      Vehicles must have an SFI approved balancer or covered with ¼ inch steel shield 1" wide, 360 degrees around a harmonic balancer no more than 1" away from balancer. Water pump may be used. Harmonic balancer must be bolted on.

2.      All automotive type engines with bell housings and clutch will run a full block plate, either a unit commercially available or minimum 3/16” steel or minimum ¼ inch aluminum with six 3/8” Grade #5 bolts evenly spaced on the bottom of the bell housing and a blanket for automatics from front to back or short blanket on bell housing with 3/16” steel shield over body of transmission. Standard transmission must have a steel bell housing complete with commercially available or 3/16 block plate.

3.      Driveshaft loops on a "U" joint next to housing, minimum thickness ¼" steel or 3/8" aluminum.

4.      Drivers must wear a lap seat belt and a DOT approved helmet.

5.      Engine shields minimum 16 gauge steel or 1/8 inch aluminum to cover the entire block that the frame doesn’t cover. (Diesel powered trucks may use ¼ inch rubber belting which must close off between frame and inner fender.)