* 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
line 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.
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.
