Note: Newly adopted or changed rules in italics.
8. *All participating cars must have attached or placed directly on both sides a sign with name of sponsor or owner and hometown. Use three (3) inch letters preferred.
* 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 T's must be assembled from stock parts and/or reproduction parts equal to stock specifications. Cars must have four fenders, splash aprons, runningboards, front splash apron, dash, and radiator shell and all replacement body parts must be made of metal, with the following exceptions:
* 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. Fuel line not to exceed 3/8" I.D.
* 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 manifolds with ports not to exceed 1 1/8" are allowed. No grinding or performance enhancing alterations of the intake or exhaust ports allowed.
Oiling system options: One outside oil
not to exceed one-half inch (1/2") outside diameter
allowed. No modifications of the inside oiling system
allowed. Transmission oil screen allowed.
Only stock Ford roller type, New Day, Anderson flapper type timers or Crystal timers allowed. Ball or needle bearing rollers optional. Quick couplers NOT ALLOWED in timer wires. Internal timer material optional.
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. Tops of open cars, use of muffler, and fans are optional.
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.
Modifications of venturi and throat of carburetors allowed as long as the Association's .710 gauge does not pass. Carburetor must be complete including all butterflies, adjusting needle, and stock spray needle. Butterflies must be original size.
No performance enhancing fuel additives are allowed. Cars must use straight automotive pump gas as fuel during the race time, starting with inspection and continuing until the end of the race.
(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.)
Chassis parts may be assembled from any year T parts.
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 washers. Neoprene seals.
Bolts on wishbone at rear of pan must be safety wired. Front wishbone accessory braces on pre-1920 cars allowed. Use standard wishbone sizes.
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 1.5-volt dry cell batteries may be used in lieu of the above 6-volt battery. (Also see Inspection Rules.)
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 or 1.208" minimum 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 cam that doesn't require modification of the block may be used. Bearing bores must be standard size, no relieving of the bearing bores. Camshaft bearings and seal optional.
Type of fourth main is optional.
Type of band material optional.
Gauges are optional.
Design and use of water pump optional.
"V" type belt and pulleys optional.
Adjustable flat tappet lifters (push rods) of stock dimensions, stem oversize to 1/32" allowed.
Balancing of rotating parts is 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. Starting times can be adjusted at the timer's discretion. If the timers recognize a beneficial 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.
may be trailered in and
will receive slow time for each leg not completed, plus a daily
penalty of one hour. 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.
Replacement of complete engine is cause for disqualification.