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 final.
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 inspection.
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 � 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 any kind.
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.
Adjustable/Cheater weight 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
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 visible. IMCA Hoosier G60 on 8 inch wheel.
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
13.) BATTERY/STARTER: 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 on crankshaft.
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 Mopar.
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
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.)).
16.) INTAKE: 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.
17.) CARBURETOR: 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 � allowed. Pump, racing or aviation gas only. NO nitrous oxide
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 heads.
Ford P heads ok, GT40 ok. Mopar magnum ok (( No Bowtie))
ONLY THE FOLLOWING S/R HEADS ARE ALLOWED:
GM: Engine Quest:CH350C,CH350H CH350I
Renegade: 21959B, 21968B World Product: Casting #'s
043600, 043610 Summit:151124, 152123
FORD: Renegade: 21960
CHRYSLER: Engine Quest:CH318B
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 are legal.
21.) 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 painted white.
22.) CLAIM/TEARDOWN: $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