Note: Newly adopted or changed rules in italics.
* All "T"s will be available for subsequent inspections at any time.
* All drivers and relief drivers must sign an Endurance Run waiver and Inspection Form
* All competing cars must be equipped with two headlights and one rear stop/tail light in working order.
* Horn of any type in working order required.
* Rear view mirror of any type required.
* Emergency brakes must be in good working order.
Windshields must be stock for year of car. No altering. Must have safety sheet of safety plate glass top and bottom. Windshields to be completely closed and sealed.
* All transmission bands must be in good working order.
* Complete set of floorboards required.
Body parts must be stock for year of car.
* Padded seat and back rest of any type required.
Original turtle deck may be replaced by some type of substantially built box or turtle deck. Minimal length and width equal to size for stock turtle deck on that year of car, with floor, sideboards and end-gate. Sides and end no less than six (6) inches high from the floor and made of no smaller than 3/4 inch wood.
Rebuilt radiators allowed. Must be built to stock dimensions including tanks and side brackets.
Gas tank must be stock for that year of car and mounted in stock position. Gas strainers allowed.
* At least 36 inches of 1 1/2 inch exhaust pipe required, properly attached to and extending from the exhaust manifold.
Only stock cast iron or aluminum intake manifolds with ports not to exceed 1 1/8" diameter are allowed. New manufactured exhaust manifolds with ports not to exceed 1 1/8" are allowed.
Oiling system options: One outside oil line not to exceed one-half inch (1/2") outside diameter. Transmission oil screen allowed.
Only stock Ford roller type, New Day or Anderson flapper type timers allowed. Ball or needle bearing rollers optional. Quick couplers NOT ALLOWED in timer wires.
Rear ends must have 11 tooth pinion and 40 tooth ring gear. Ruckstell locked in high.
* Body must be painted, color optional.
Hoods are not required.
Holes must be drilled through the heads of the following bolts for braided seal wire: Left hand front head bolt, Right hand middle head bolt, Middle two small pan bolts, and a hole must be drilled through the threaded end of both bolts that fastens the carburetor to the intake manifold.
Only NH swayback and/or Ford "F" swayback carburetors allowed. Must be complete including choke butterfly. The Association's 0.710 inch gauge MUST NOT go through the carburetor.
A restrictor plate with two gaskets provided by the Association, will be placed between the intake manifold and carburetor., supervised by the inspectors on the day of the inspection. Plate will be a thickness of 1/8 inch metal with an 11/16 inch diameter hole.
31a. Restrictor plates will not be used on engines with cast iron pistons.
(Also see all other rules)
The top 3 cars will be torn down immediately following the last flag. Additional teardowns will be put to a vote of the Endurance drivers. Endurance drivers will vote to accept or reject items of question.
The first, second and third place cars will be torn down by a panel of five inspectors appointed by the Board of Directors. None of the inspectors may be a driver of the car to be inspected. If a car is disqualified, the next place lower will be inspected, until three have been found qualified. An inspector who is the driver of the car coming up for inspection due to disqualification of another car will be replaced by the directors with another inspector. All inspectors must vote.
(Also see all other rules.)
Zerk fittings in place of oil and grease cups are optional.
Only Model "T" wire, wooden spoke or disk wheels allowed. May use Model "A" 21 inch wire wheel or 30 by 3 1/2" wire wheels.
Only stock Model "T" or Ruckstell rear-ends and axles with:
-standard eleven tooth pinion
-forty tooth ring gear
-stock roller bearings
Options: Bronze or roller thrust bearings. Neoprene seals.
Bolts on wishbone at rear of pan must be safety wired.
Shock absorbers are optional.
Use stock configuration spring sets with a minimum of seven leaves per spring set.
(Also see Inspection Rules.)
Use a group 1 six volt wet cell battery for magneto system back up, lighting lamps, running horn and starter. Six 1-volt dry cell batteries may be used in lieu of the above 6-volt battery. (Also see Inspection Rules.)
Zerk fittings in place of oil and grease cups are optional.
Cylinder bore not to exceed 3.825" maximum or 3.750" minimum
Only Ford script high heads allowed with the following exceptions: No limit to amount of milling of mating surfaces; Removal of metal in combustion chamber may be done to allow clearance for shoulder of piston and head of valves. Refer to Illustration for Head
The crankshaft must be Model "T" Ford Script with a stock stroke of four (4) inches. Chroming, hardening or grinding of journals allowed, not to exceed 1.250" maximum diameter.
Counter-balanced crankshaft not allowed.
Valves: Stainless steel and swirl polished valves are optional. For all valves use a minimum stem diameter of 5/16", a maximum head diameter of 1.500" and seating face of 45 degrees. Use either pins or two piece keepers. Hardened valve seats are optional. Radiused, 45 degree or three angle seat grinds allowable.
Use of offset key between crankshaft timing keyway and the crankshaft timing gear keyway is optional. Camshaft timing gear material optional. Camshaft gear may be drilled to realign camshaft pins for valve-setting purposes only.
Any Model "T" Ford Script camshaft may be used. The lobes may be modified as you wish as long as the Ford Script still shows. Camshaft bearings and seal optional.
Type of fourth main is optional.
Bonded type bands optional.
Gauges are optional.
Design and use of water pump optional.
"V" type belt and pulleys optional.
Adjustable lifters are optional.
(See Inspection Rules.)
* Each car will come to a complete stop before starting at the timers direction.
Timing will begin as designated for each car whether or not the car is on the starting line. If the timers recognize a benefical savings in time, a lagging car may be sent out ahead of its designated time. Usually this will be discussed with the Directors ahead of time. Time will start for this car when it leaves the starting line.
Removal of head or pan while at stop (not under time) or on tour day will impose a time penalty of 1 hour. Report this infraction to the inspectors immediately. Removal of head or pan under time must be reported to the inspectors at the first opportunity for replacement of seal.
Changing the carburetor imposes a time penalty of 15 minutes. Report the infraction to an inspector immediately. Replacement carburetor must meet the requirements stated in the Inspection Rules.
Disabled cars may be trailered in and will receive the following penalty on a timed day: Slow time for the day plus a one hour time penalty. In addition, cars trailered in on the last day are not eligible for prize money or trophies.
Tour day mileage is mandatory. Cars not completing tour mileage will receive a 1 hour penalty.
Replacement of complete engine is cause for disqualification.
(end of rules)
New rules for this year are in italics. The major one is the rule to allow cars with cast iron pistons to run without a restrictor plate.