2018 Hobby Stock Rules
RULE BOOK DISCLAIMER
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 events, and by
participating in these events, all participants are deemed to
have complied with these rules. NO EXPRESSED OR IMPLIED WARRANTY
OF SAFETY SHALL RESULT FROM PUBLICATIONS OF OR COMPLIANCE WITH
THESE RULES AND OR REGULATIONS. They are intended as a guide for
the conduct of the sport and are in no way a guarantee against
injury or death to a participant, spectator, or official.
The race director shall be empowered to permit reasonable and
appropriate deviation from any of the specifications herein or
impose any further restrictions that in his/her opinions do not
alter the minimum acceptable requirements. NO EXPRESSED OR
IMPLIED WARRANTY OF SAFETY SHALL RESULT FROM SUCH ALTERATION OF
SPECIFICATIONS. Any interpretation or deviation of these rules
is left to the discretion of the officials. Their decision is
1.)FRAME: Any year
model American made car or truck. That came production with
leaf springs. No metric (Monte Carlo) Or front strut type
cars allowed. Unibody cars must be tied together. No front
wheel drive vehicles. Wheelbase must match the factory spec
for that frame (1 inch tolerance). No alterations to the
frame are allowed other than bracing.
2.) ROLL CAGE: All
tubing shall be at least 1.5 inch OD tubing of at least .095
wall thickness. The cage shall be an "A" shaped affair with
bars running from the upper right corner to the lower left
corner and just the opposite on the other side, forming an
"X" as viewed from front to rear. There must also be a
cross bar on top of "A" and 4 bars down the side & around
the top to complete the cage around the driver. Minimum
three door bars, both sides, parallel to ground, and
perpendicular to driver.
Minimum four uprights tied
from frame to top door bar on driver side, and minimum three
uprights on passenger side. Steel door plates, 18
gauge or 0.049 inch minimum thickness, that must be securely
welded to outside of door bars on driver's side. Plate must
cover area from top door bar to rocker panel and from rear
down post to 5 inches in front of seat. Must be visible for
3.) BODY: Bodies must
have a factory production appearance and may be made of
sheet metal or aluminum. Any body style is acceptable as
long as it is GM to GM, Ford to Ford, Dodge to Dodge. Body
must match frame. Example: Leaf Camaro to leaf Camaro.
Hoods & trunk lids must be pinned down. Front & rear inner
fender wells may be removed. Trunk area may not be cut no
further than pinion of rear end. Must have stock type floor
pad rocker panel to rocker panel-third member pinion to
front firewall. Must have stock firewall. Holes in firewall
must be covered. Plastic nosepiece and tailpiece allowed,
recommended to match body. No wedge or late model noses
allowed. Ground effects OK. All glass must be removed, all
window openings in body must remain open. A maximum 7 inch
metal sun visor allowed across top of windshield opening.
All doors must be securely fastened. No raised quarter
panels. Fenders and quarter panels may be trimmed for tire
clearance. Back of body must be enclosed from fender to
fender. Deck height not to exceed 40”. Spoiler must not
exceed 6 inches in height & only 2 end braces are allowed
not to exceed 6 inches in length. Spoiler may not be wider
than trunk lid. ENCLOSED INTERIORS ALLOWED PROVIDED YOU CAN
CRAWL OUT THE PASSENGER SIDE. BACK PANEL OPENED UP TO LET
MUD FLY OUT.
4. BUMPERS/RUB RAILS:
Bumpers not covered by plastic nose or tail piece must be
complete, unaltered OEM, welded or bolted to steel bumper
mounts. Fabricated tubular bumpers (front and rear) are
allowed as long as the front bumpers are covered by a
plastic nose. All bumpers must have rounded edges. Main
bumper bar must be minimum 1.50” inch O.D. (maximum 2 inch)
with 0.083 inch (maximum 0.125 inch) wall thickness. Must
run inner rub rail mounted flush to body. No sharp edges
allowed 0n bumpers, rub rails or bolts. No bars past outside
edge of body other than rub rails. ALL CARS MUST HAVE TOW
LOOPS SECURELY FASTENED TO FRONT & REAR BUMPERS.
5.) INTERIOR: 3 ¼
inch windshield bars in front of driver. All flammable
material must be removed (carpet, headliner, plastics,
etc...). Gauges may be removed. Aluminum high back or
containment type seat only and must be bolted in. Driver
seat must be in about stock position . SFI approved safety
harness is mandatory. Neck brace and window net or arm
restraints also mandatory. Quick release steering wheel is
OK. Kill switch required within easy reach of driver and
must be clearly marked "OFF" and "ON". Driver must be sealed
off from track, driveline, engine and fuel cell. Dash not to
extend more than 24 inches back from center of lower
windshield opening. Dash must be flat, rear can be no higher
than front, except for cowl in front of driver. No other
interior tin or covers. Front firewall may be reworked to
allow engine clearance. Must be repaired with steel of
at least same thickness as OEM. Inside rear quarters panels,
below window level, may be cut out. Doors may be gutted. All
OEM holes in firewalls and floor must be covered with metal
or aluminum. Rear firewall and speaker deck must be metal
and be of OEM design for that make and model. No mirrors of
6.) FUEL CELL: Racing
fuel cells are mandatory. 32 gallon maximum. Fuel cell must
be securely fastened in trunk above level of OEM trunk
floor, behind rear tires, with minimum two solid steel
straps around entire cell, 2 inches wide and .125 inch
thick. No fuel cells allowed over rear end housing.
7.) FRONT SUSPENSION:
All mounts must be in stock locations. Only the following
shocks are permitted:
AFCO 10 Series Steel Body
Shocks or Pro Street Stock Series Shocks. All shocks must
not be painted for identification purposes.
No adjustable or aluminum
shocks. Racing springs are allowed. No coil over shocks. No
heim end shocks.
jacks are allowed. OEM upper A ‐frame may be replaced using
aftermarket upper. A‐frame (steel or aluminum cross shaft
allowed),must be nonadjustable & no hiem ends bolt on
spindle savers allowed.
Shocks subject to dyno test
at any time at the track officials discretion.
8.) REAR SUSPENSION:
AFCO 10 Series Steel Body Shocks or Pro Street Stock Series
Shocks only. No hiem end shocks. Racing springs are allowed.
No adjustable shocks. No coil overs. Screw type weight jacks
are not allowed. All components and mounts must be steel,
unaltered OEM or OEM replacement, in about OEM location and
match frame. This means very close to OEM location. Rear
shock mounts can be fabricated due to crash repair or
previous elimination. No sliders. Shocks subject to dyno
test at any time at track officials discretion. No sway
bars, pan hard bars, spring spacers, extensions, chains or
cables. No suspension stops of any kind allowed.
9.) REAR END: 9 inch
Ford housing highly recommended. GM rear end must have axle
retention. Grand National rear ends are allowed. All rear
ends must be locked. No gold tracs or any other form of
traction control devices allowed.
10.) BRAKES: Must
have at least 3 wheel brakes. Aftermarket pedal assemblies
allowed as long as brakes are not adjustable. Brake shutoff
valve must be in engine compartment, no front to rear
shutoff allowed. No brake bias gauges are allowed and brake
lines must remain visible.
11.) WHEELS/TIRES: 10
inch maximum width steel racing wheels only. Bead lock
wheels allowed on right rear only. Metal, plastic or foam
mud plug/covers are allowedon all wheels. No plastic or
aluminum wheels. 5/8 wheels studs mandatory. Hoosier asphalt
pull off tires only. Tires must durometer at least 50 at any
time. Grooving and sipping allowed. No softening or
chemically treating tires. Sidewall markings must remain
12.) WEIGHT: All cars
must weight 3200lbs after race with driver. All extra weight
must be bolted to frame outside of the drivers compartment
and must be painted white and be clearly marked with car
One 12 volt passenger car battery only, and must be securely
mounted between and above frame rails, and positive terminal
must be covered. Battery must be in marine type case if
mounted in driver compartment. Starter must bolt in OEM
location. Car must have capabilityof starting without being
pushed or pulled. Car must leave initial staging area on
demand, unaided, or go to rear of that race.
14.) ENGINE: Engine
must be stock production factory blocks only. Roller cam
blocks are allowed and must run mechanical fuel pump. No
bowtie or aluminum blocks. Casting numbers must be readable
by tech official. No 400 blocks Engine set back to the #1
plug even with upper ball joint. Flat top or dished pistons
only. 1”inspection hole in oil pan mandatory.
No undercut counter weights
Must maintain stock stroke
Chevy 3.484” Ford 3.500” Mopar 3.578”
Maximum cubic inch
displacement to include clearance and wear is
361 for GM, 363 Ford & 370
Electric cooling fan is ok.
Factory stock or HEI Distributors only.
No remote coils on GM cars.
No onboard electronic
devices capable of storing information allowed.
No aftermarket electronic
amplifying devices allowed.
No traction control devices
of any kind.
602 GM Crate Engine will be
allowed. Must have GM, IMCA
Or NE Smith seals. ((Must
run 2 Bl Carb.)).
Unaltered cast iron intake or cast iron marine intake or
approved unaltered aftermarket dual plane aluminum intakes
allowed. No Air Gap Intakes. No porting or gasket matching
or acid dipping allowed. No Brezenski intakes or heads
allowed. Plenum webbing cannot be removed on any intakes. No
grinding of any kind on intake. Intakes may NOT be reworked
under the carb area.
4412 Holley 2 barrel or Barry Grant/Demon 2 barrel allowed.
500 CFM. Bottom throttle plate hole 1 11/16". Venture will
measure 1 3/8” Must pass go no go gauge. Carb Spacer no
taller than 1 ½ allowed. Pump, racing or aviation gas only.
NO nitrous oxide allowed.
18.) HEADS: Cylinder
heads must be stock OEM (Vortec OK) Or Stock Replacement
(see list below). Casting numbers or engraved markings must
be readable by tech official.
2.02”-1.60” valves are the
largest size allowed GM & Ford
2.02”-1.625” Mopar. No
titanium components allowed.
Aftermarket valve springs
are OK, not to exceed 1.50 inch OD,
No "beehive" type springs.
OEM or roller rockers allowed.
No angle milling of heads.
62cc minimum combustion chamber
On all heads. It is racers
responsibility to check chambers.
Screw in studs OK not to
exceed 7/16". Polylocks are OK.
Stud girdles OK. No porting,
polishing or removal of
any casting in valve pocket
area or combustion chamber.
No aluminum or angle plug
Ford P heads ok, GT40 ok.
Mopar magnum ok (( No Bowtie))
ONLY THE FOLLOWING S/R HEADS
Renegade: 21959B, 21968B
World Product: Casting #'s
FORD: Renegade: 21960
19. CAMSHAFT: No roller cams
or lifters allowed. Hydraulic
cams only. OPTION # 1 14”
vacuum @ 1000 rpm,s. Variable
duration lifters ok.
OPTION # 2
.480 lift measured at valve retainer. Example: .320 lobe
lift with 1.5 ratio rocker arm = .480 lift .316 Lobe lift
with 1.52 ratio rocker arm = .480 lift .300 lobe lift with
1.6 ratio rocker arm = .480 lift. Roller rocker arms must be
factory marked. If any bolts etc. are fixed to prevent
inspection it is drivers responsibility to remove
valve covers or disqualification.
20.) HEADERS: Headers
TRANSMISSION: Automatic transmissions must be stock or
TCI transmissions must have working torque converter. No
Direct drive with "dummy" converters. Standard transmission
must be 3 or 4 speed OEM. OEM style clutch & pressure
plates. Minimum weight of all components (flywheel clutch
disc & pressure plate & bolts) 30 pounds. No triple disc or
"mini" clutches. Aftermarket steel flywheels are OK. Direct
drives & lightening of transmissions not allowed. No Bert,
Brinn or Falcon transmission allowed. Must have 360 degree
explosion proof bell housing. Must have clutch inspection
hole. Driver must be able to put car in gear from
park/neutral and move forward and reverse at anytime of
inspection. Must have driveshaft loop. Driveshaft must be
$550 cash and swap. $50 goes to Wrecker for pulling
engines. Driver claiming must have raced in the Hobby Stock
class the previous 2 feature events. Claimed items include:
Block, rotating assembly, camshaft, heads, balancer & timing
cover. Anyone wishing to make a claim must have finished the
Feature on the lead lap on the night of the claim. Only top
4 cars may be claimed. To claim, you must go to the infield
and hand the cash to the officials within the 5 minute
protest period. If you leave the track, the claim is void.
If you refuse to swap, or refuse the teardown, you lose all
money won that night and all accumulated points plus a 4
week suspension. Second refusal, same applies plus a
calendar year suspension. Track owner may claim ANY engine
as long as claim is made within 5 minute protest period. No
driver may claim more than 1 engine during the season. No
driver can be claimed more than twice. Claimed engine will
be marked and must be run upon return to Batesville Motor
Speedway. If "marked" engine is not run upon first visit
back to Batesville Motor Speedway you will not be able to
run until "marked" engine is placed in car. There is a $225
teardown rule, on included are: pistons, cams, lifters,
rockers, porting of heads and intake, flywheels/clutch,
driveline. Driver only may protest. $25 of the money goes
into the driver's point fund. Only 2 representatives from
protest team & 2 from team being protested allowed in
infield during teardown. Participants will act in a
gentleman manor or protest or claim cancelled at officials
REMEMMBER THIS, IF IT DOESN’T SAY YOU CAN, THEN YOU CAN’T