2021 Crate Racin' USA Thunder Bomber Rules
*Rule Changes for 2021
Technical Rules MAY Be checked by Technical
Inspectors at ANY time!
Everything MUST remain STOCK unless otherwise
1. The Rules and/or Regulations set forth
herein do not express or imply warranty of
safety from publication of or compliance with
Rules and/or Regulations. These rules are
intended as a guideline for the conduct of
Crate Racin' USA sanctioned Thunder Bomber
Division events, and are in no way a guarantee
against injury or death to participants,
spectators, or officials.
2. The Rules and/or Regulations will apply to
all Crate Racin' USA Thunder Bomber Division
sanctioned events. The Rules and/or
Regulations will also apply to events
sanctioned by the Crate Racin' USA Thunder
Bomber Division, but not counting for National
points (i.e. events that pay more than Weekly
Payout limit, event held outside of Points
Season dates, World Championship, etc.).
Crate Racin' USA officials shall have full
authority over said sanctioned events, and in
the event of any dispute, the head official's
decision will be final.
All competitors and cars are subject to
inspection by Crate Racin' USA Technical
Inspectors or their representatives at any
time during any event.
Crate Racin' USA, and it's officials and
representatives reserve the right to
confiscate any suspicious or deemed illegal
parts or components.
6. Crate Racin' USA reserves the right to
alter or amend these Rules and/or Regulations
in the interest of fair competition, efficient
completion of an event, or for safety. All
officialís decisions are final.
7. The Rules and/or Regulations for the Crate
Racin' USA Thunder Bomber Division have been
sanctioned and approved by Crate Racin' USA,
P.O. Box 2037, Adairsville, GA 30103, and
available online at
There is NO appeal process in the
determination of or application of fines
and/or penalties assessed by the series. All
Officialís decisions are final, and drivers
will not be allowed to compete in any
sanctioned events until all fines are paid,
penalties assessed have been cleared, and/or
suspensions have been served.
The following are REQUIRED: Series decal will
be required to be placed on the left rear of
the trunk/tail piece, and on the upper front
of the door under the pillar post, on each
All drivers participating at Crate Racin' USA
Thunder Bomber Division sanctioned tracks and
events must purchase an Annual Membership at a
cost of $25 per year if purchased directly
from the series by calling the office,
purchasing on the series website, or via mail,
or $35 if purchased at the track($10 goes to
track for Processing Fee). This membership
makes the driver eligible for any Weekly
Racing Series points fund monies and
contingency awards. Drivers wishing to compete
in the 2021 Thunder Bomber Shootout Series may
pay an additional $25 to cover both Weekly and
Shootout Series events.
A driver visiting and not competing at a
Weekly Sanctioned track on a regular basis may
purchase Temporary Membership at a cost of $10
Weekly Sanctioned tracks will be updated of
driver's membership status on a weekly basis
via e-mail and through My Race Pass (for
tracks that participate in sanction
Safety is the primary responsibility of the
Series recommends Drivers have a SFI-Approved
full fire suit (top and bottom), gloves, and
shoes. Full Fire Suit (top and bottom or
one-piece) is required (SFI rating optional,
but highly recommended).
Snell rated SA2010 or SA2015 full-face helmet
Series recommends the use of a head and neck
restraint system, but is not required.
All cars must have a fully charged fire 2 lb.
extinguisher mounted within reach of the
driver. Series recommends a 5 lb. halon
All cars must have a kill switch within easy
reach of the driver, and clearly marked "Off"
All cars must have a quality fuel cell with
roll over valve (check valve) in fuel cell
Minimum three(3) inch wide, two(2) inch if
using head and neck restraint, SFI-Approved
five point safety belts, mounted securely to
the roll cage. (Recommend belts be no more
than two years old.)
Seats must be securely fastened to frame and
or roll cage.
Any pre-race technical/safety inspection and
car or equipment is deemed unsafe by officials
will result in not being allowed to compete.
Officialís decisions are final!
All track specific general safety rules or
requirements will apply at all times to all
participants (i.e. window nets, gloves, door
plates, head and neck restraints, etc.) at
NO two-way radios, cell phones, or other
communication devices will be allowed.
RaceCeiver is the ONLY communication device
permitted. Drivers caught with any other
communication device will be disqualified for
that event (heat or feature).
Mirrors are allowed at discretion of track
ALL weight/lead must be painted white and
include the car number. Weight must be
securely fastened to the car with a minimum
two (2) 1/2" diameter bolts. No weight may be
attached to the back bumper. Losing weight in
any race (i.e. heat, b-main, feature) will
result in disqualification for that event.
Cars must have legible numbers on both sides
and on the roof.
Car must weigh 3,200
pounds with driver after the race.
Tires, Wheels, and Brake Rules
8" maximum wheels with .25" tolerance.
14" or 15" - must be the same all the way
No aluminum wheels.
NO DOT racing tires. Any 70, 75, or 78 series
street legal DOT series radial tires - NO
direction or competition tires.
8" towel city racing recap OK, but must punch
minimum of 50.
6. Tires subject to lab
samples at independent lab for softening or
alteration. NO chemical treating or
conditioning of tires!
May run beadlocks, but must face outside.
May run offset rims and wheel spacers.
Stock brakes and master cylinders.
Must have 4 wheel
working brakes after race.
OEM brake calipers only - no aluminum.
Dual master cylinder ok - adjusters ok.
Fan and Radiator Rules
Radiator must remain in stock location.
Aluminum radiator with fabricated brackets ok.
NO electric fans.
Headers are legal, but must exit parallel to
NO tri-y headers. NO H-pipes, and NO X-pipes.
No turn down on pipes (straight only).
No merged collectors.
Fuel and Fuel Cell Rules
Fuel cell must be mounted securely inside
trunk with firewall between driver and fuel
MUST run pump gas or racing fuel. No Nitrous,
oxygenated racing fuel or fuel additives.
Fuel Protest - Drivers may protest fuel.
Protest fee is $150. Acceptance Fee is $150.
Fuel samples must be sent to Blue Ridge Labs
Blue Ridge Labs is the official test facility
for Crate Racin' USA and all lab results and
officialís decisions are Official and FINAL.
Fuel will be tested for oxygenates, oxygenated
racing fuel, and fuel additives.
Visual protest only.
Cars must be neat in appearance.
No late model type noses or fender flares.
Must remain stock unless otherwise stated.
1968 or newer American made car.
No station wagons, trucks, jeeps or
No strut cars.
Rear of car must be closed. No holes or flaps.
Car must have a deck lid.
May make front fenders, doors, and rear
fenders. Aluminum doors and fenders ok.
No side spoilers.
Spoiler may not exceed 60" wide and no taller
than 6". No spill plates, and no straps or
spoiler supports of any type allowed.
Cannot exceed 48" from ground to the top of
the rear spoiler.
May run any replacement roof, but must be a
minimum of 48" x 50". NO slant roofs.
13" minimum door and rear glass opening. For
safety, MUST have 13" wide window opening on
both left and right side in case driver needs
to exit in an emergency.
Interior may be boxed in.
Front and rear bumpers required. Rubber nose
is ok, but must be stock appearing. No cow
Bumper cannot extend past the quarter panel or
must run a bumper cover.
Breather must be boxed in on all 4 corners,
and cannot exceed 2" high. May NOT pull air
from inside the car.
Front inside wheel wells can be cut or removed
for clearance, but not excessive.
ALL firewall holes must be covered. Must have
stock firewall in original location, and
firewall must extend to doors.
Must have stock floorpan in original location.
Floorpan must extend to rear of driver's seat.
Floorpan must go from frame rail to frame
May replace dash with sheet metal. Interior
metal must not be higher than dash.
Gutting hood and trunk are ok.
May use Lexan in rear side windows.
Wheelbase and Frame Rules
Frame must match make and model of car - 1"
+/- tolerance allowed.
No shortening of frame. Must be stock. No x-ing
or cutting of frame.
Length between spring eyes must be stock.
Wheelbase must match make and model - 1"
Engine must remain in stock location.
Aftermarket mounts ok.
Any OEM stock size engine - 363 maximum - .060
over over bore maximum.
Repaired engine parts must be approved.
ARP Rod bolts OK, but must remain stock size -
One piece rear seal block ok.
No high performance engines or special order
Stock engine blocks only.
Must use stock replacement, low compression
piston. Cannot cut top of piston.
No flat top, 4 eyebrow piston - must be
Speedpro H423 DCP or H423 NCP replacement
piston OK. No metric ring package.
Pistons must be at least .009" in block.
No bottoming of lifters.
No knife edging or lightening, etc.
Cast crank must weigh 48 lbs.
No stroke or destroke.
Journals may be turned no more than .060"
Rod width may not be less than .940. No powder
rods. Stock replacement
Stock timing chain gear set or Cloyes C-3023X
adjustable timing chain. No offset key ways.
Balancer - 6 3/4 by 1" - no machining.
May run racing pulleys - NO serpentine
pulleys. V-belt racing pulleys ok.
Aluminum water pump allowed.
Aftermarket fuel pump &
fuel rod ok.
Aftermarket power steering ok.
Two(2) piece timing covers ok.
No remote oil filter or evac systems.
Any open chamber head ok, but must meet the
NO aftermarket heads.
May run stock replacement screw in studs or
May run aftermarket valve cover.
Heads cannot be less than 72 cc.
No angle milling.
Stock or stock replacement valve for make and
model. Steel valves only. Stock stem diameter.
Valve springs can be Z28 springs.
i. Comp 742 retainers or
No cutting under 45 - no competition valve job
- no 3 angle valve job.
Shims can be used under valve springs at a
limit of .060 per spring.
May use offset locks, but not with shims.
Rocker arms must be stock or stock
replacement. 1.5 maximum. No self aligning
No porting or polishing.
No Vortec parts.
Stock, cast iron. No aluminum intakes.
No Holley pattern factory intakes.
Must have vacuum fitting behind carburetor.
Stock 2 or 4 barrel, conventional style only.
No super bowls or individual cylinder tuning.
No modifications except choke flap removal.
No removal of choke horn.
600 Holley - part #1850 ok. Must be box stock
with Mr. Gasket adaptor part #1932. May use
two(2) .070 gaskets maximum.
e. No heat shields
around carburetor. Dust shield mounted to air
filter base ok.
Stock timing chain or Cloyes C-3023X
adjustable timing chain.
112 lobe seperation +/- 1 degree
Advancing or retarding the cam in car with
adjustable timing ok.
Cloyes C-3023X only Ė no cam buttons.
Stock cam or stock replacement cam only.
Duration for intake + 2 degrees / - 10
.006 - 256 degrees
.050 - 195 degrees
.200 - 95 degrees
Duration for exhaust +2 degrees/ - 10 degrees
.006 - 261 degrees
.050 - 202 degrees
.200 - 106 degrees
Must have 18" vacuum at 1000 RPM
Hydraulic cam and lifters only.
Cams CS-274 sealed power and CCS-2 Melling and
Comp Cam 12-105-3 are a stock produced cam and
will be looked at with a little more variance.
All custom ground cams will be required to
meet the above specifications.
6. Flywheel and Clutch Assembly
Stock steel flywheel - 14 pounds minimum
Stock type clutch and pressure plate - minimum
10.5" (pressure plate 12 pound minimum).
May use hydraulic clutch.
Protest, Claim Rules and Procedures
Visual protests must be done within 5 minutes
of completion of the Heat Race or Qualifying.
Visual protest fee - $50 (non-refundable).
Driver must finish in Top 5 to do a visual
protest, and can only protest car in front of
you. No reverse protests!
If a car is found wrong as a result of visual
protest, that car will be disqualified and
have to start at the rear of the Heat Race or
Feature Event (whichever is next).
Items found illegal in a visual protest must
be corrected or weight penalty could be added
for Heat Race of Feature.
Major violations could result in the car
having to move up to a higher division.
Visual items CAN NOT be protested after the
2. Engine and Tire Protest
Bottom End - $500
Protest Any 2 Items - $300
Cam Protest - $300, Track retains $100
Transmission Protest - $250. Acceptance fee -
$100. Track Keeps $100
Refusal to tear down three(3) times during the
season will result in driver being
disqualified from competing in the division
for the remainder of the season.
f. Tire Protest - $125.
Acceptance fee - $125. Track keeps $125.
3. Shock Protest Rule
a. Driver can only
protest shocks from the car that finishes
directly ahead of them.
b. Driver MUST finish in
the Top 5 to protest shocks.
c. Driver can protest a
maximum of two shocks, any combination of
front and rear.
d. Shocks must be legal,
certified CRUSA shocks.
e. Shocks may be sent to
CRUSA for verification at Tech Official's
discretion. Driver protesting shocks will be
responsible for cost of shipping shocks to
CRUSA and cost for verification.
f. Series Officials may
confiscate and send shocks for verification at
g. Shock protest = $50
per shock, $25 acceptance fee. Track retains
$25 per shock.
ALL Official's Decisions
are FINAL, and Official's reserve the right to
increase penalties, levy fines, and enforce
suspensions at their discretion.
Stock type ignition.
Stock type distributor only. No billet, no
circuit board distributor.
No high performance distributor or high
No altering firing order.
Must be stock with all working forward and
May run 350 or 400 turbo automatic with OEM
working torque converter, stock type and 11"
May run transmission cooler.
No power glides.
Aftermarket throw out bearing ok.
No lightning of gears.
Three(3) speed straight drive, cast iron
transmission with all working gears.
Straight drive transmission cars must have
blow proof bell housing or scatter shield -
May use hydraulic clutch.
Drive Shaft Rules
Must be stock for model of car or may run 2"
No carbon fiber and no aluminum drive shafts.
"U" or square type safety loop on front of
drive shaft assembly is required.
Rear End Rules
GM 10 or 12 bolt GM
9" Ford or 9" Ford
floater ok. 9" Ford mounting points
must be stock type with NO adjustability. 4
1/2" maximum - 3 1/2" minimum from center of
the axle tube to center of trailing arm bolt.
(ANY ADDITIONAL HOLES MUST BE BLOCKED OFF).
Rear shocks must be in stock location on top.
Bottom mount can be moved.
May run aftermarket axles.
No ball spline axles.
Any gear ratio allowed.
Locked or limited slip rear ends allowed.
Full spools ok (no scalloped).
No gun drilled axles.
No gun drilled rotors or scalloped rotors.
No lightning of any parts.
All components must be made of steel.
Disc brakes ok - doesn't have to match model
Can cut top of trailing arms for pinion angle.
NO traction control devices of ANY type
Suspension must be stock
unless otherwise stated
May run racing springs with adjustable
4. Front shocks must be
in stock location. May move 3 inches maximum
for travel, no angle change. Rear shocks must
be in stock location on top, bottom mount can
No heim joints on any shocks.
Top A-frame can be cut or move top mounting
No adjustable blocks - 4" of lowering blocks
Tube type A-arm on top only ok - non
adjustable - screw in ball joints on top ok.
Ball joint must be mounted on top of Aframe
(no QA-1) non rebuildable (1/4 inch
Can use heavy duty OEM steering and suspension
Leaf or coil springs can be changed to
stronger leaf or coil of the same type.
Cutting of coil spring allowed - rear shims on
coils are ok.
Adjustable or non-adjustable spring buckets
Adjustable buckets in rear ok.
All mounting/hook up points on chassis must be
in stock location.
Cannot change angle of rear shock.
Top trailing arm may be cut for pinion angle
Leaf spring cars may adjust perches for pinion
May adjust rear shackles.
Aftermarket bushing in A-frames and trailing
arms ok but may not swivel.
20. Effective April 1,
2021 - MUST Run Crate Racin' USA Certified and
Labeled Bilstein AK1043 front shocks and
AK1044 or AK 1050 rear shocks. NO EXCEPTIONS!
Discounts available for member drivers.
Contact the CRUSA Office at (678)719-8888 for
Shocks must remain in stock location. May move
for travel only - no angle change.
No heim joints on any shocks.
Fines, Penalties, and Suspensions:
Pre-Race Technical Violation (s): Any
technical violation (s) discovered during
pre-race technical inspection, the driver will
be notified of violation (s), and car must be
fully in compliance before allowed to compete.
2. Chemical Alteration
of Tire (s): Any driver found to have
chemically altered a tire will be subject to
the following penalties:
a. Disqualification from
event and no CRUSA points or Thunder Bomber
b. Forfeiture of tire if
c. Penalties could be
Legality of Part (s): Any question concerning
legality of part (s) by CRUSA or track
technical inspector, the part (s) in question
will be confiscated and sent to Chevrolet
Performance or CRUSA for further inspection.
The finish for this race will be held until
legality of part is determined. Points,
monies, and finish will be adjusted in the
event of a disqualification. Any parts deemed
illegal will be confiscated. Failure to allow
confiscation of any part will be penalized the
same as an inside the sealing system engine
infraction and penalized accordingly.
By entering and/or competing in any Crate
Racin' USA sanctioned event, drivers, car
owners, and team members waive any right to
file an appeal. All officialís decisions are
All decisions of series officials and/or the
promoter regarding the application or
interpretation of the rules, and the scoring
of finishing positions shall be non-litigable.
All participants agree that they will not
initiate any legal action against Crate Racin'
USA, LLC, the promoter, or officials to
challenge any decision, to seek monetary
damages, to seek injunctive relief, or to seek
any kind of legal remedy. Any such legal
action pursued by a participant which violates
this provision, the participant (driver)
and/or owner expressly agrees to reimburse
Crate Racin' USA, LLC for all its attorney
fees and costs in defending against such legal
By signing the annual membership/registration
agreement, participants agree that they will
comply with the written rules and procedures
of Crate Racin' USA, LLC. If the participant
breaches this membership/registration
agreement, he or she will be liable for actual
and liquidated damages sustained by Crate
Racin' USA, LLC.
Code of Conduct and Conduct Penalties:
Drivers, car owners, and teams are to always
conduct themselves in and orderly and
professional manner while competing at any
CRUSA sanctioned event. Series director will
judge incidents of conduct accordingly and use
the following criteria to assess any penalties
upon a driver, car owner, or race team as
Driver will be notified of penalties that have
been levied by the series director. All series
director's decisions are final.
Series director may choose to levy monetary
fines, suspension from sanctioned events, and
deduct points as deemed necessary by the rules
infraction or actions taken by a driver at any
time. Series and tracks reserve the right to
enforce or levy fines, points penalties,
require changes, or suspension from
competition for any actions deemed detrimental
to the sport, series, or track. This includes,
but is not limited to, social media posts,
and/or derogatory or distasteful
statements/slogans/photos/graphics on cars or
any other driver related material visible to
the public (i.e. helmets or driverís suits,
trailer or transporter, etc.).
Series will adhere to, and uphold any
suspension levied on a driver by a specific
track. If a driver has been suspended or
barred from entering the property, that will
be upheld by the series. Series and sanctioned
event do not overrule a trackís decision to
refuse entry to any driver, car owner, or crew
NOTE: These rules are not intended to
eliminate competition or accidental contact.
However, they are intended and may be used to
penalize deliberate contact and/or
over-driving or deemed deliberate acts of
aggression towards other drivers.
No driver will be allowed to
compete/participate while under the influence
of any alcoholic beverage or
illegal/controlled substances. If a driver is
found to be participating in such a manner,
that driver will be immediately suspended and
removed from competing.
Any competitor that verbally abuses a series
or track official by using profane and/or
disrespectful language is subject to a fine of
$100 for the first offense. A $300 fine,
one-race suspension, and loss of points for
the second offense. After a second offense,
driver is subject to 30-day or longer
suspension and loss of points as determined by
Any physical confrontation, either on the
track or in the pit area, will result in the
aggressor (s) being suspended for one race,
loss of points, and $300 fine for the first
offense. A second offense will result in the
driver being suspended for the remainder of
the seasons, and a $500 fine.
Any driver who enters another driver's pit
area, or approaches another driverís car on
the speedway, will be deemed the aggressor.
Away from either driver's pit area, both
drivers will be considered aggressors. Drivers
should be aware that they are responsible for
any member of their race team, and the above
penalties will apply to the driver concerned
even if the
driver is not directly involved.
In the event of a felony conviction of a
driver, team member, or team sponsor,
disciplinary action could be a minimum of a
365-day ban from the series beginning with the
date of the conviction or the date of the
completion of any incarceration to said
conviction, whichever date shall last occur.
Disciplinary action may also include, but is
not limited to, the right of the series
organizers and officials to suspend either
temporarily, or permanently, any driver, team
member or sponsor, whose actions, in the sole
opinion and discretion of the series
organizers and officials, may have resulted
in, or may result in harm or detriment to
Crate Racin' USA.
Any incidents occurring during the last five
events of the season, may result in penalties
being applied to the beginning of the
Any incident (s) that are judged to be
deliberate acts of aggression, whether on or
off the track, under green or caution, will
result in disqualification and a monetary fine
to be determined by series' officials.
Series officials reserve the right to increase
the above penalties, by either adding
additional money, suspension time, or points
loss, depending on the severity of the
Series officials reserve the right to revoke a
competitor's membership at any time. All
official's decisions are final.
Any threat of, or legal action taken or levied
against the series by a driver/race team, will
immediately result in that driver's indefinite
suspension from competition in any/all Crate
Racin' USA sanctioned divisions and events.
Any disqualification, other than a weight
violation, will result in no points and no
money for the event. Weight violation will
move the driver to the end of the finish
The decisions made and disciplinary actions
taken by the series and officials hereunder
shall not be appealed by the driver, team
member, or team sponsor affected thereby.
ALL OFFICIALíS DECISIONS ARE FINAL.
ATTENTION CAR OWNERS AND DRIVERS:
Please remember that we are here and can race
because of the fans, promoters, and sponsors.
If they donít benefit, we wonít
benefit. While we understand that this
competition involves substantial financial
stakes, there is no excuse for bad or unruly
behavior which would tend to bring the series,
tracks, or sponsors into disrepute.
PLEASE NOTE: By entering, qualifying, and/or
competing in a Crate Racin' USA event, you are
accepting these rules and regulations as being
those under which you are prepared to race.
Any driver entering and competing in a Crate
Racin' USA event acknowledges and accepts the
following: Crate Racin' USA and its assigns
may use the drivers names, pictures, likeness,
and performance in any way, medium, or
material, including without limitation by and
through, television, radio, air wave: cable
and satellite broadcasts, film productions,
videotape reproductions, audiotape
reproductions, transmissions over the
internet, and public and private on-line
services authorized by the Crate Racin' USA
and the like, before, during, and after the
event, for promoting, advertising, recording
or reporting in the event or any other Crate
Racin' USA sanctioned event, and do hereby
relinquish all rights there to for these
purposes, provided however, that the car owner
and driver shall retain the exclusive use of
its or his/her name, picture and likeness in
connection with product endorsements and the
sale of products, services, concessions, and