2008
SPEC LATE MODEL RACING (SLMR) RULES
Published
1/14/08
***
Warning ***
THE RULES AND/OR
REGULATIONS SET FORTH HEREIN ARE DESIGNED TO PROVIDE FOR THE ORDERLY CONDUCT
OF RACING EVENTS AND TO ESTABLISH MINIMUM ACCEPTABLE REQUIREMENTS FOR SUCH
EVENTS. THESE RULES SHALL GOVERN THE CONDITION OF ALL
SPEEDWAY
EVENTS, AND, BY PARTICIPATING IN THESE EVENTS, ALL
SPEEDWAY
COMPETITORS ARE DEEMED TO HAVE COMPLIED WITH THESE RULES. NO EXPRESS OR
IMPLIED WARRANTY OF SAFETY SHALL RESULT FROM PUBLICATION OF, OR COMPLIANCE
WITH THESE RULES AND REGULATIONS. THEY ARE INTENDED AS A GUIDE FOR THE
CONDUCT OF THE SPORT AND IN NO WAY A GUARANTEE AGAINST INJURY OR DEATH TO
PARTICIPANTS, SPECTATORS, OR OTHERS.
GENERAL
RULES
1.)
No MSD Rev Limiting Chip Rule
2.)
Standard Steelhead Motor Rule (See below): 2300#
3.)
IMCA Spec Motor Rule including intake spacer: 2350#
4.)
These engines must run with 390 carberueter
a.) Under 370 cubic inch engine with aluminum 18 degree or 23 degree
heads: 2400#
b.) Bigger then a 370 cubic engine: 2450#
c.) All
aluminum headed motors must add 40# in front of their rear engine plate.
Aluminum block motors must add an additional 60# in front of their rear engine
plate. (This weight will be included in your total weight, 75 pound max)
5.)
Tire Rule” WRS 55’s. No grooving or siping. Sanded with no more
than 24 grit paper.
6.)
390 carbs must pass NASCAR gauges.
7.)
IMCA engines must pass IMCA specs.
SECTION
1: WHEELBASE
A. The minimum average wheelbase is 103
inches. No tolerance.
B.
Rear suspension is optional, but no devices allowed of any kind that are
designed to change the
wheelbase
of the car while in competition will be permitted. (Control arms with
springs or rubber
bushings
not permitted on the rear of the car.) Limiting devices will be allowed
on the left rear only.
SECTION
2: ENGINES
I. Engine
Set-Backs
A.
All competing models using an engine larger than G.M.
361 cubic inches or Ford or
Chrysler larger than 364 cubic inches are allowed a maximum engine set back of
6 inches ( to be measured from the center of the forward most spark plug hole
to the center of the upper ball joint.)
B. All competing models using a Ford or Chrysler engine 364 cubic inches or
smaller or a G.M. engine 361 cubic inches or
smaller are allowed a maximum engine set back of 8 inches.
II.
Steel Head Engine Rules (Small Cubic Inch)
A.
Only O.E.M. stock production steel heads as numbered below will be allowed.
B.
No Dart, Vortec, fuel injected, Ford Cleveland, or GT40 heads allowed.
C.
Heads will be G.M. bowtie cylinder head part number 10134392, 14011058, or
12480034 casting number 14011034, Ford M-6049-n351, Mopar head casting number
4532693. Mopar may run Chrysler R block #P4532907 or P4532908. Mopar
heads may be 15 or 18 degrees. O.E.M. J Design Mopar heads are not legal.
No modification outside of the combustion chambers, except surfacing, three
angle valve jobs, and touching up the combustion chamber. Titanium valves
and retainers allowed.
D.
Roller camshaft, lifters, and rocker arms will be allowed. Shaft rockers will
be allowed.
E.
Any aluminum intake may be used with a maximum total height of 6” from top
of intake to floor of plenum. Up to a 2”spacer may be included in the
6” height. No super high rise intakes allowed. Plenum must have
flat floor.
F.
May run up to and including the Holley 4150 series 850 c.f.m. carburetor.
G.
No titanium engine parts, except titanium valves and retainers.
H.
All engine casting numbers stamped on the engine will be left on the block at
the bellhousing area.
I.
No epoxying of block numbers will be allowed. Block numbers will be
stamped by inspector if needed
J.
Minimum weight will be 2300 pounds after all races (this is for all
engines of all makes with a compression ratio no greater than 11.0 to 1.)
III. Crate
Engine Option. Any 602 or 604 Crate Engine may compete with the exception of a
#2200 weight minimum for both 602 and 604 engines.
SECTION
3: FUEL AND FUEL CELL
A. Gasoline must be Sunoco 110 Purple or 112 Blue octanes only.
No alcohol, ethanol or oxygen bearing additives allowed.
B.
Commercially manufactured fuel cells mandatory, fuel cell capacity may be from
5 to 32 gallon cell, including fill spout.
C. Fuel cell cannot extend below rear end tubes.
D. All fuel cells must be encased in a metal container.
E. All fuel cells must be mounted securely to the frame of the car, and must
be mounted in framework similar to diagram on reverse side of rule sheet.
F. Fuel cells must have non-vented caps, rollover valves in return and
vent lines and must pickup from top of cell.
G. All cars must be equipped with a fuel cell guard that is mounted separate
of the fuel cell and is mounted securely to the frame of the car.
H. Fuel cell guard must be made of at least 1-inch tubing and must extend to
the bottom of the fuel cell.
I.
No electric fuel pumps allowed. (Belt driven fuel pumps or mechanical
pumps will be permitted.)
SECTION
4: WINDSHIELD SCREENS ROLL CAGES, FRAMES
A.
All cars are required to have a screen in
front of the driver, with a frame and at least 4 vertical bars in the frame
besides the sidebars. Screen must have openings no smaller than ˝” X
˝” and no larger than 2”X 2”.
B.
All cars are required to use a roll cage with
at least 3 horizontal bars across the driver’s door.
C.
All competing models will be required to have
a vent window bar and a bar in the center of the roll cage over the driver’s
head.
D.
All cars will be required to have a bar to
protect the driver’s feet.
SECTION
5: CARBURETORS AND AIR CLEANERS
A. Any eligible carburetor may be used. Approval of carburetor means
approval for all competitors within the same guidelines.
B. All competing models must run the Holley 4150 series carburetor. Must meet
the Holley 4150 height specs. (See Engine Rules
for specific C.F.M.).
C. Any eligible dry element round air cleaner will be permitted. (Minimum 12
inches, maximum 17 inches in diameter and maximum 4 inches in height.)
D. Only round metal air filter housing will be permitted. The top and
bottom of the air filter housing must be solid and must be the same diameter.
A maximum of a one (1) inch lip will be permitted from the air filter element
to the edge of the air filter-housing top and bottom. The air filter
housing must be centered and set level on the carburetor. It is
permissible to attach a shield to the air filter housing. The shield can
be no higher than the height of the air filter element. Tubes, funnels,
or any device, which may control the flow of air, will not be permitted inside
of the air cleaner or between the air filter housing and the carburetor
E. Cowl induction may be used as long as the air box is designed to draw air
from under the hood. One side or end of air box must be open. Hood
scoops will be permitted to be open in the rear only.
F. No carburetor air dams or devices allowed increasing the airflow to the
carburetor, either inside or outside of air cleaner.
SECTION
6: CYLINDER, HEADS, INTAKE MANIFOLDS, SPACER PLATES, AND IGNITION SYSTEMS
A. Any eligible cylinder head may be used. Approval of cylinder
heads means approval for all competitors within the same guidelines.
B. The valve centers must remain the same as production manufactured steel
cylinder heads for the make and model of engine being used.
C. Intake manifold must be of stock configuration of O.E.M. manifold. (Inside
of the bottom of intake manifold must be flat. No devices permitted
inside of intake manifold to disrupt the air flow to the engine.)
D. Any aluminum intake may be used with a maximum total height of 6” from
top of intake to floor of plenum. Up to a 2” spacer may be included in
the 6” height. No super high rise intakes allowed. Plenum must
have flat floor.
E. A spacer plate may be used between the carburetor and the intake. May
be a one hole or 4-hole spacer plate, with nothing inside of the spacer plate
to enhance or increase the airflow to the engine.
H.
No onboard computers, micro-controllers, processors, automated electronics,
recording devices, electronic memory devices, memory chips, or digital readout
gages of any kind permitted. Digital Tachometers will be allowed.
I.
Only one (1) electronic firing module amplifier is permitted, if used.
J.
Only one ignition coil permitted.
K.
No traction control of any kind.
SECTION
7: CLUTCH, FLYWHEEL AND BELL-HOUSING
A. High speed multiple disc clutches are permitted.
B. All cars must be able to be put in and out of gear with the engine running
and the car sitting still.
C. All competing models must be equipped with a flywheel and an operable
starter.
D.
A production manufactured steel bell housing or a heavy duty explosion proof
aluminum bell housing may be used on all models.
SECTION
8: TRANSMISSION, DRIVE-SHAFTS, REAR AXLES AND REAR TREAD WIDTH
A. O.E.M. production manufactured
2 to 4
speed transmissions that are cataloged through dealer channels will be
permitted. Bert, Brinn, and Falcon circle track transmissions are permitted.
B. All transmissions must have at least 2 speeds forward and one reverse.
C. No 5 speed, over drive or automatic transmissions allowed.
D. All transmissions must bolt directly to the rear of the bell housing which
bolts directly to the rear of the engine block.
E. All drive shafts must be painted white.
F. All cars must have a 360-degree hoop toward front of drive-shaft, made of
at least Ľ inch by 2 inch steel strap.
G. It is recommended to have a drive-shaft safety hoop built out of 4 or
5-inch diameter by 6 inch long round tubing.
H. Full floating rear ends are compulsory. Rear
end must be quick-change type and track approved.
I.
Rear end coolers may be used, but cannot be mounted inside of the driver’s
compartment.
J. No open tube rear ends allowed.
K. No cambered rear ends permitted.
L.
The rear tread width can be no wider than the
front tread width. (Both sides)
M.
Axles must be made of steel only.
SECTION
9:
BATTERY
, MIRROR, WINDOW NET, SEATBELTS, RADIATOR, FAN BLADE, WATER PUMP, AND OIL
COOLER
A. All batteries must be mounted in a safe and approved manner.
B. No mirrors permitted inside or outside of car.
C. All cars are required to have an approved window net in the driver’s
door.
D. All cars are required to have a lap belt, crotch belt, and 3 inch shoulder
harness.
E. All belts must be securely fastened to the frame of car.
F. Only 1 radiator permitted for the purpose of cooling water. Radiator
must be mounted in front of the engine.
G. Water pump must mount in stock location.
H. No electric fans permitted. No flat bladed fans permitted
I. Oil reservoirs must be mounted in front of rear end housing.
J.
Oil reservoirs or oil coolers cannot be mounted inside of driver’s
compartment.
SECTION
10: ROOFS, BODIES, AND NOSE PANELS
(See
attached drawing for specs)
A. Bodies must be mounted in a similar manner to stock appearing.
B. Aftermarket production manufactured nose panels must be mounted in approved
manner. The
length measurement of the nosepiece for all models will be 51" from the
center of hub to front edge of nose.
The front and sides of nose panel
cannot be cut or altered, with the sides mounted no lower than 4 inches from
the ground with the car at racing height. The sides of the nose panel
must be parallel to the ground.
C. The racetrack officials must approve any bars ahead of the nose panel.
D. Roofs may be made of fiberglass or aluminum, but must meet specifications
as set forth in the rules and must be approved by the officials.
E. All roof panels must have front mounting posts and rear roof panels.
F. The front roof posts will be required to be a minimum of (1) one inch wide
and a maximum of (2) two inches wide. Left and right side will be required to
go to the outer rear corner of the front fenders.
G. Rear roof panels must be mounted as per diagram on the reverse side of this
sheet.
H. Rear roof panels will be required to extend out to the quarter panels.
I.
Left and right side rear roof panels must be the same length and design.
J.
Car or opening covers are not permitted. Exception: In the event of rain or
inclement weather you my cover your car until the weather passes or the rain
stops.
SECTION
11: REAR SPOILERS AND REAR DECKS
A. All competing makes and models will be permitted to use a one-piece solid
rear spoiler 8 inches in height.
B.
All spoiler measurements will be made from the deck and will be a measurement
of all spoiler material.
C.
All competing models will have a maximum rear spoiler width of 72 inches.
D.
All competing models will be permitted to use 3 spoiler braces. Spoiler
braces may be 18 inches maximum at base but cannot extend past the rear roof
posts.
E.
All spoiler braces will be required to fit the track’s template, be no
higher than 3 inches at the front of the base and can be no higher of extend
rearward past the rear spoiler.
F.
Spoiler braces will be permitted to have up to a ˝ inch break in them.
SECTION
12: WEIGHT RULES
A. All weight must be in block form of no less than 5 pounds, and must
be painted white with the car number on them.
B. All weight must be bolted to the frame of the car in a secure manner. Should
use at least (2) ˝ inch bolts for each weight that is bolted to the car. No
weights over 50 pounds permitted. No weight can be bolted to the rear
bumper of the car. No stacking of weights permitted.
C. Any weight mounted behind the fuel cell must be mounted below the frame of
the race car.
D. No mounting of weight inside of the driver's compartment or above the
interior of the car permitted.
SECTION
13: TIRE RULE
A.
The seris tire will be Hoosier WRS or WRS 2 D-55.
B. 11.0/88, 11.0/90, or 11.0/92 only will be permitted. No
softening, grooving or siping of tires allowed.
You
may regroove your WRS tires with a #3 blade to match the tread design of the
WRS2 until the WRS tire is no longer legal. Any tire(s) that are regrooved
will need to be approved by the tech inspectors before they are used in
competition. Note: Remember, we allow tire buffing to break the glaze. No tire
grinding allowed.
C. You may only use sandpaper up to and including 24 grit to remove the
glaze on the top layer of
tires. When
you are completed with sanding of tires, the edges of the tread block must
remain
the
same as the edge of the block next to it. You will only be able to create the
look of a worn
tire,
and not something of a different tire face appearance. (Example: no wavy
tread pattern or
deep
grinding will be allowed.) Metal grinding disks are not permitted.
SECTION
14: LINEUP AND RACE PROCEDURES
A.
All drivers will draw for heat
races.
B.
22 Cars will make the A feature
event, and the top 12 will redraw for starting position.
