2008 Hobby Stock Rules
IMCA Legal Hobby Stocks are also considered legal & are permitted to compete.
The Tech Departments understanding is: This is an entry level class all replacement parts must be as used on an OEM Vehicle as a Stock replacement part, Built to factory specifications by a major automotive supplier. Intended solely for Street use and mounted in the factory stock mounts and locations. Engines may be machined to maximum OEM specifications as an automotive rebuilder would use to make a reliable street engine. IE factory Service specifications. All of above shall be applicable to all parts on the car unless otherwise noted below. Amendments to these rules may be made at anytime. Decisions of the officials shall be final.
ROLL CAGE -
Must use .095 -inch tubing, at least 1.75-inch diameter for main cage and
door bars. No offset cages. Four-post roll cage must be used, front and rear
hoop welded to the OEM frame. Rear hoop must have "X" brace, consisting of one
horizontal and one diagonal bar, 1.25-inch O.D. and .083-inch wall thickness.
Front down-bars must be tied together. Must be minimum of 40 inches between
front and rear down bars at top of door panel. No more than 41 inches from top
center of windshield to front edge of rear hoop; no more than 13 inches to front
edge of front hoop and top halo must be no less than 40 inches across, outside
to outside. Must have minimum of one cross bar in top of halo. Required rear
kickers and engine hoop must be minimum 1.25-inch tubing, with .083-inch wall
thickness. Three horizontal door bars on both sides are mandatory. Minimum of
four uprights tied from frame to top door bar on driver side, three on passenger
side. May have two bars for protection in front of radiator, behind bumper,
within confines of body, no wider than stock frame horns. May tie front horns
together. All bars, front and rear, must be inside body. Steel doorplates,
18-gauge or .049-inch minimum thickness metal, must be securely welded to
outside of door bars on driver's side. Plate must cover the area from the top
door bar to the rocker panel and from the rear down post to five inches in front
of the seat. Must be visible for inspection. Absolutely no square tubing or
galvanized pipe allowed. Fuel cell protection bar may be used, mounted frame
rail to frame rail, no higher than the fuel cell and inside the trunk area.
Maximum 1.75-inch pipe.
SAFETY-
Five point safety belts, sub belt and shoulder harness required. No Y type
shoulder harness allowed. Belts must be mounted to cage. SFI approved
full fire suit, fire retardant neck brace and fire retardant gloves required,
racing shoes recommended. Hans or Hutchins device allowed with out neck brace.
Helmets are required and must be Snell SA90, SA95 or SA2000. Helmet must be worn
at all times car is on the track and must accompany vehicle at time of
inspection. Roll bar padding is required in driver compartment. Fire retardant
padding recommended. Full size (minimum 16-inch x 20-inch) window net required
(no string-type nets). Window net to be mounted so latch is at top front of
driver side window. Kill switch required within easy reach of driver and must be
clearly marked "OFF" and "ON". 360-degree drive shaft loop is required and must
be constructed of at least quarter-inch by two-inch steel, or one-inch tubing,
and should be mounted six inches back from front U-joint. All cars must have a
high-back aluminum-racing seat fastened to roll cage with minimum 3/8 inch
bolts, Driver's shoulders can be no further back than the front of the
window post ('B' pillar).
ELECTRONICS -
No transmitting or listening devices allowed in car. No electronic
monitoring computer devices capable of storing or transmitting information
except tach allowed on cars. No digital gauges allowed on car. No ignition
control boxes allowed, OEM ignition only. No electronic traction control devices
allowed. No alternators allowed.
FUEL -
Pump Gas or 10% Ethanol blend fuel only. Racing fuel cell required
no boat or stock automotive fuel tanks. Must be securely fastened, (above level
of stock trunk floor), by at least two 1/8-inch thick by 2"wide solid steel
straps, around entire cell. Metal firewall must be between driver and fuel cell.
All cell mounts must be steel, attached to frame/cage. No adjustable fuel cell
mounts. Fuel cell must be in a steel container Max 18 gauge. Fuel cell vents,
including cap vent, must have check valves. Fuel lines through driver
compartment must run through metal pipe or metal conduit. No fuel filters in
driver's compartment. No fuel pressure regulators or fuel return lines on the
car. Stock appearing fuel pump only. May run factory fuel pump
with factory return line at the pump.
BATTERY -
One 12-volt battery only must be
in a marine-type case securely mounted to frame or roll cage in a metal frame
behind the seat or in trunk area. Max 18 gauge Battery Box.
TIRES & WHEELS -
Stock (OE) 205/75, or 205/70, 14-inch, or 15-inch passenger tires only.
All four tires and wheels on car must be same size. Tires must be inside body.
No mud, racing or fancy, exotic, trick gumball tires allowed. No softening,
conditioning, sipping or grooving allowed.
Must be D.O.T. stamped wheels with standard bead bump - must weigh a minimum of
21 pounds.
No racing wheels or mag wheels allowed. Spoke steel wheels allowed. Maximum
seven-inch wide steel wheel. Reinforcing of stock wheels recommended. One inch
steel lug nuts required. No wheel spacers allowed.
Vehicle Weight-
As we have no weight limit for the cars that race at our speedway it shall be a
judgment call on behalf of the tech officials if you have over done areas of you
car in order to gain rear percentage. IE solid bar tubing in rear of car, heavy
material bumper braces, heavier than needed replacement rear frame rails, etc.
If we deem necessary we will require you to add weight in the engine
compartment to offset the conditions found. All replacement frame tubing will
have 1/2'" holes drilled every 6"for inspection purposes.
FRAME -
Frame must match body. 109-inch wheelbase minimum for unibody cars, 107.5-inch
minimum for full frame cars - no more than one inch difference from side to
side.
Frames may be "X" braced. Rear of frame behind rear tires, from a point no
further forward than one inch behind the factory seam, may be replaced in stock
location with two-inch by three-inch steel tubing with .095-inch wall thickness.
All replaced rails must have inspection holes in the tubing.
Factory seam must remain visible. Must replace the same length material removed.
Unibodies must be tied - rear frame to front frame. No station wagons,
convertibles, front-wheel drive, four-wheel drive or rear engines. Bumpers must
be in stock location.
Front and rear bumpers must be capped to fender the width of the bumper. No
reinforcement of bumpers. Bumper may use 1 3/4" x .095 wall round or square
tubing to mount bumper to car.
This along with good fender caps and safety cables will keep bumper on the car
with out adding extra weight.
All Bumpers must run 2 safety cables from bumper to frame. Bumper
caps must be made of 18 gauge metal with 1/4 inch bolts, (No Rivets.)
Inner bumper brace must have inspection holes drilled in them.
SUSPENSION & STEERING -
Must be original type suspension and steering and match the frame. No rear
independent suspension allowed. Steel springs only. No add-on quick steer boxes.
No remote reservoirs on power steering pumps. All shocks must be steel non
adjustable with OEM mounts. All shocks must mount in the stock location
(top and Bottom). Driver cannot claim shocks and engine in the same event. No
spacers, lumber, chains or cables allowed.
BRAKES -
Master cylinder must be in stock location. Approved OEM brakes on all four
wheels must work. No OEM Antilock Brake Systems. No rear wheel disc brakes.
All drums and rotors may not be machined or worn past the factory minimum
thickness or maximum diameter. No after market brake pedal assemblies
allowed. No brake shut-off or bias allowed. No Brake pressure valves of any kind
on the car.
BODY -
1960 or newer American made stock passenger automobile with factory steel top.
No Camaros, Firebirds or Mustangs. Sunroofs and T-tops must be reinforced and
enclosed. All bodies must be approved OEM (and be mounted as factory)
IE Doors must meet the rocker panels Roof must have factory rack. After
market plastic nosepieces allowed. No aftermarket tailpieces, spoilers, wings,
skirts (If skirts are necessary than no lower than stock frame rails),
air scoops or anything that alters the stock appearance. No aluminum hoods. Hood
must be separate from fenders - no one-piece or tilt front ends. No gutting of
hoods or trunks. No cutting out kick panels. All hoods and trunks must be
securely fastened and the back of hood must be sealed off from driver's
compartment with metal. Steel rub rails no bigger than one inch by two inches
may be attached to body from fender well to fender well, flush with body May
also use the Lexan rub rails. Maximum seven-inch metal sun visor (measured
anywhere) may be added to top of windshield opening only. All sharp edges,
torn fenders and body panels to be repaired prior to next race. Must have a
minimum of three windshield bars in front of driver. No ballast allowed. All
glass, plastic, upholstery, rear seat, lights, mirrors, and chrome removed. Dash
is not to extend more than 24 inches back from center of lower windshield
opening. Dash must be flat except for cowl in front of driver. No other interior
tin or covers. All doors must be secured shut (welded, chained, bolted, no
rivets) the front inner wheel wells may be removed, but not the rear wheel
wells. Must have bumper caps as wide as bumper and must be bolted or welded to
body and bumper, minimum 18-gauge metal, aluminum or steel, no sharp edges. All
window openings to remain open. If you have a home made nosepiece it must go
straight up and down and must be bolted behind bumper.
DRIVE TRAIN -
Unaltered OEM, Manual Transmission, with all forward and reverse
gears operational. (I.E. 4 speed transmissions must have 4 forward and 1 reverse
gears). Or an OEM automatic transmission, with original bell housing and
functional torque converter containing a minimum of three quarts of fluid, or
approved OEM (10.5" or larger) single organic
disc-type clutch, solid center organic clutch disc OK inside an
explosion-proof steel bell housing on manual transmission only. No button
clutches.
All bell housings must have a 2 x 3 inch removable inspection hole directly
below the clutch and flywheel for inspection purposes or bell housing may need
to be removed for inspection. No aluminum or lightened flywheels. Manual
transmission Flywheels must weigh at least 16 lbs. Automatic must
have an approved scatter shield (may be constructed of quarter-inch by
three-inch steel, 270 degrees around flex plate or flywheel. Torque converter
must have a minimum 1/8-inch plug. No truck rear ends allowed. Steel axles only.
Nine-inch Ford rear end allowed, but must be mounted like stock rear end for
that make and model. Minimum 2.5-inch diameter steel drive shaft
must be painted white. Drive shaft centered in car tunnel. Rear end may be
welded or mini spool, no full spools. No Light Weight Ring Gears.
No floater rear ends. Rear suspension must match frame. No electronic or
mechanical traction control devices allowed
NUMBERS -
All cars must be numbered with large, legible numbers on sides, top and rear
panel. Numbers must be in contrasting color from body, in all light conditions.
Numbers on side of car to be at least 4 inches thick and 20 inches high.
Numbers on top must be at least 4 inches thick and 30 inches high.
ENGINE, CARBURETOR & IGNITION
A. Engine Block- OEM cast iron only, all modifications to factory
service specs only. OEM bore and stroke combinations only, Lifter bores may
not be altered. Maximum 361ci (GM), 363ci (Ford), 368ci (Chrysler). Due to the
many possible combinations of bore and stroke you may be asked to remove a head
at the track for measurement. Gaskets will be at your expense. Subject to fine
and loss of track points if found illegal.
B. Crankshaft- Must have a stock appearing rear crank flange.
Balancing OK, No lightening, knife edging or reducing of the crankshaft
circumference. It is recommended that you have a (2") inspection hole
above oil level in Oil Pan or you will have to drop Pan for inspection. Ford and
Chrysler will require pan removal to verify crankshaft
C. Harmonic Balancer- Must be of OEM design with rubber mounted
dampener ring
D. Connecting Rods- Must be of OEM design (IE If stock rod was
"I-beam than Aftermarket must be "I-beam) It is also required the aftermarket
rods weight the same or more than OEM. Rod length is up to engine builder (does
not have to be OEM length). Rods may use bolt and nut or cap screws to secure
the caps.
E. Pistons- Cast or Forged, Flat top or Dished. No domed or gas
ported pistons Allowed.
F. Camshaft- Solid Lifter or Hydraulic only, No Roller Camshafts
allowed. Valley tray OK (recommend cutting tray at rear most lifter so lifter
may be removed for inspection from the distributor hole).
G. Cylinder heads- must be unaltered approved OEM. All heads must
have been used in a production vehicle. No limited production or special purpose
over the counter only heads allowed. No porting, polishing or unapproved valve
bowl work or other alterations of any kind to heads or intake. Heads may be
reworked to accommodate the largest OEM valve size available in a production "on
highway" use vehicle. If cutting new valve seats the ring left below the seat
maybe removed with a carbide cutter in a head service machine only, one
cutter angle only no multiple cuts. (No die grinder work anywhere
no exceptions). Cylinder heads may use screw in studs and must have stock
diameter single valve springs. No Bee hive valve springs allowed.
H. Valve Train- No full roller or roller tip rocker arms. No guide
plates allowed. No stud girdles. Oil Deflectors allowed two bolts maximum.
I. Exhaust Manifolds- OEM cast iron exhaust manifolds only. No
center dump or tubular steel manifolds allowed. Exhaust pipes must extend past
firewall. Must remain dual exhaust, no crossover or ‘Y’ pipes allowed. No oxygen
sensors allowed.
J. Intake Manifold- OEM cast iron two-barrel intake only. No
aluminum intakes allowed.
K. Carburetor- All cars must run a stock two-barrel carburetor, no
Holley. (GM venture 1.375", base 1.690", aluminum booster .250"). May remove
choke, but no other alterations allowed. Conventional air cleaner housings only.
No top flow air cleaner housings, cold air boxes or air cleaner ductwork
allowed. No Carb spacers allowed. Hot air deflectors may be up and down
between radiator and engine.
L. Fuel Pump- OEM style diaphragm pumps only. No fuel pressure
regulators or electric pumps allowed.
M. Ignition System- OEM Stock appearing (all components)
Distributors only. Must run stock firing order.
N. Cooling system-Minimum two-core approved steel or aluminum
radiator. OEM steel or aluminum water pumps only. Steel or aluminum pulleys
allowed. No serpentine belts allowed. Any overflow tubes are to be directed to
the ground, between frame rails.
O. Starter-OEM starter must bolt in stock location.
P. Accessories- Stock steel accessory brackets only. OEM
accessories and brackets only. Accumulators and Accusumps must be mounted under
the hood.
ENGINES ARE
RESTRICTED TO NINE TO ONE COMPRESSION IN ONE OF THE TWO FOLLOWING METHODS-9.0
to 1 compression ratio using Whistler. (Blue Box)
(or)
Cast iron heads only. OEM Production heads only. Flat top pistons only; GM cars
- approved steel head numbers are - 014, 195, 267, 330, 336, 339, 388, 393, 441,
445, 454, 487, 493, 545, 598, 624, 642, 709, 799, 813, 862, 881, 882, 920, 991,
993, 997; Ford cars, no after market or SVO heads; Chrysler cars, no after
market or W2 heads, 360 cubic inch heads only. Must be 76 cc heads or larger.
Other heads may be approved call FIRST!!
ENGINE CLAIM
1. Must race at JS Speedway two consecutive nights before claiming an engine.
2. $500 cash claim on engine, $25 of this goes to wrecker for pulling engine.
3. $500.00 or EXCHANGE, up to claim driver to decide what they want.
4. Claim does not include – 1.) Flywheel, 2.) Clutch, 3.) Pressure plate, 4.) Bellhousing, 5.) Exhaust manifold, 6.) Carburetor, 7.) Starter, 8.) Motor mounts, 9.) Sending units and switches for oil pressure and water temperature. 10.) Fan and pulleys, 11.) Clutch ball, 12.) Clutch arm, 13.) Throw out bearing, 14.) Dip stick, 15.) Water pump, 16.) Fuel pump, 17.) Distributor, 18.) Plug wires, and 19) Oil Pan
5. First 4 position finishers must report directly to claim area and are subject to engine claim by any other driver finishing fifth on back in feature, failure to report directly to claim area will result in disqualification and loss of money and points for night. Any driver lapped by 4th place car is not eligible to claim.
6. Top 4 drivers must get out of car. One pitman per car in front of car is allowed. Driver allowed one claim only per event, regardless of outcome of that claim. In case of multiple claims on same engine, engine will go to qualified claiming driver finishing farthest back
7. Driver making claim must drive his racecar immediately after finish of feature, under its own power, directly to claiming area. Claim must be made known to officials within five minutes within the completion of feature. Only drivers and officials allowed in claiming area.
8. Only driver may claim engine and only driver may agree to sell or refuse to sell engine. First sell or no sell by driver being claimed binding.
9. Refusal to sell will result in disqualification, loss of all season track points from JS, forfeiture of money won, and suspension of four racing nights from JS Speedway.
10. Any driver found to be claiming an engine for anyone other than himself will lose all JS points for the season and will be suspended for two racing nights and fined $500 paid to JS.
11. All claimed engines must be removed from car at the track; buyer must examine engine before removal - once removal is started, sale is final. Removal must be completed within one hour of claim or it will be considered a refusal.
12. The cylinder block may not be altered in such a way as, to prevent it form being used in a stock application. Stock OEM components must be able to be immediately used in their stock location. Drivers are to be held accountable for any sabotage discovered while pulling the engine, and will be responsible for any and all penalties as a result of any sabotage. Any sabotage discovered to claimed engine will result in driver being suspended from JS competition for four racing nights and until $500 cash fine is paid to JS. *The claim will be disallowed and the money returned to the claimer.
13. No driver may claim more than two (2) engines during current calendar year.
14. No one driver may claim any other one driver more than once during current calendar year.
15. It is not mandatory to run claimed engine at the next race night.
TECH QUESTIONS CALL ROB KELP AT 712-346-8685.
ANY OTHER QUESTIONS CALL JON MCCORKELL AT 1-507-841-2450.