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* All drivers and relief drivers must sign an Endurance Run
waiver and Inspection Form
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All T's must be assembled from stock parts and/or reproduction
parts equal to stock specifications. Cars must have four fenders, splash
aprons, running-boards, front splash apron, dash, and radiator shell and all
replacement body parts must be made of metal, with the following
exceptions:
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* All competing cars must be equipped with two headlights and
one rear stop/tail light in working order.
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* Horn of any type in working order required.
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* Rear view mirror of any type required.
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* Emergency brakes must be in good working order.
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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.
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* All transmission bands must be in good working order.
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* Complete set of floorboards required.
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Body parts must be stock for year of car.
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* Padded seat and back rest of any type required.
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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.
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Rebuilt radiators allowed. Must be built to stock dimensions
including tanks and side brackets.
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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.
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* At least 36 inches of 1 1/2 inch exhaust pipe required,
properly attached to and extending from the exhaust manifold.
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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.
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Oiling system options: One outside oil line allowed. No modifications of the inside oiling system allowed.
Transmission oil screen allowed.
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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.
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Rear ends must have 11 tooth pinion and 40 tooth ring gear.
Ruckstell locked in high.
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* Body must be painted, color optional.
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Hoods are not required. Tops of open cars, use of
muffler, and fans are optional.
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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.
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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.
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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. Choke and throttle rods must pass a visual inspection for
stock uniform shaft dimensions with no obvious modifications. Butterflies must be original size.
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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.
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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
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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.
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Counter-balanced crankshaft not allowed.
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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.
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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.
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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.
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Type of fourth main is optional.
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Type of band material optional.
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Gauges are optional.
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Design and use of water pump optional.
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"V" type belt and pulleys optional.
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Adjustable flat tappet lifters (push rods) of stock dimensions,
stem oversize to 1/32" allowed.
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Balancing of rotating parts is optional.
