Ruby Mountain Winged Sprints – Bold indicates changes, clarifications or additions.

If your car falls outside these rules please call RMWS please call Bob Massie at 775-934-9407, Ed Macedo at 775-273-0812
or Andy Greenwood at 775-385-0590.

•Minimum weight after main event 1,650 lbs – scales will be at each race
•Open to any conventional sprint car chassis
•Wheelbase: minimum 82” Maximum 92”
•Main cage structure: shall be no less than 1 3/8” O.D. with .095” minimum wall thickness for chrom molly tubing (1 ½” x .095
wall is recommended) Case must extend 2” above drivers head.
•The cars body, motor, driver seat, and fuel tank assembly must be mounted to the chassis centerline
•Sprint car type bumpers and nerf bars are mandatory and must be securely bolted to the chassis using minimum ¼” bolts.
•Bumpers and nerf bars must be constructed of steel tubing, minimum of 1” O.D. X .060” to 1” O.D. X .120” maximum. No solid
bars and no lead bumpers.
•1” raised rail frame ok

Drive Train
•All drive trains must have a driveline or rear-end coupler system (to disengage rear-end from motor) Torque arm drivelines
may not be used. All drivelines must be enclosed and contain no more than one (1) U-joint and that must be at the front of the
•Buckley Yokes are acceptable
•A torque tube safety strap or driveline hoop is required
•Any sprint car quick-change with a maximum 2” axle offset is allowed.
•Rear end must be able to be engaged or disengaged from within the cock-pit.

•Any conventional 4 – torsion bar or bar on rear/coil on front is acceptable. No 4 coil over allowed.
•No independent rear suspensions shall be allowed
•Straight axles only
•No devices that can adjust the suspension or shock absorbers by a driver in the car shall be allowed.
•No adjustable shocks – period.
•1 shock per wheel

•Any aluminum or steel, 6-pin or splined wheel allowed
•No plastic or carbon fiber wheels allowed
•Bead-lock wheels are recommended. Mandatory on out-side right rear.
•Will need 4

•No tire rule to date – If you purchase a new tire from Hoosier – please let them know you are a part of Ruby Mountain Winged
Sprint Series in Nevada.

•Minimum left front and left inboard rear brake system required. Brakes must be in proper working order at ALL times.
•Steel, cast iron, or aluminum rotors only; steel recommended – TITANIUM or CARBON FIBER, rotors NOT allowed.

•Sprint car bodies only. May be fiberglass or metal
•Side panels are mandatory.
•No ground effect or wing-type bodywork shall be allowed
•Windshield screens are mandatory
•A floor-pan is required and must extend front the firewall to the front of the driver’s seat.
•Wings: ◦Top wing shall be no larger than 25 sq. ft. and no more than 60” wide.
◦Side panels shall be a maximum of 30” H x 72” L.
◦There shall be a 1” minimum wikerbill allowed on the top wing.
◦Top wings shall be mandatory at all times. Top wings shall be surely mounted.
◦Front wings shall be a maximum of 6 sq. ft. (2’ x 3’)
◦Wing sliders are optional


Note: we are a flat tappet cam class. We will handle roller cams on a case by case basis and may be subject to restrictions.
•All racecars must be self starting and must be able to start unaided.
•Radiators shall be mounted in engine compartment ahead of motor
•All engines will be required to run a soft touch rev limiter at 6,600 RPM. ◦MSD boxes that accept a rev limiter chip will be
◦Must be mounted OUT of drivers reach.
◦No traction control allowed. Ignition boxes with traction control capability will not be allowed. – An infraction of this rule will
result in a $1,500 fine AND loss of all accumulated season points.

•Carburetors ◦No Pedator carbs
◦Crate motors may use Holly 4bbl. / 750 CFM maximum for gas or alcohol
◦Built motors must run a 4412, Holly 500 CFM 2bbl or Demon 500 CFM 2bbl – gas or alcohol
◦Venturi may be opened .010 (ten thousands) over catalog specifications
◦Choke tower may be removed
◦External jets allowed
◦Bottom of carburetor shall be no more than 4” from the top of the manifold. This includes any adapters, spacers, etc.
◦No RAM intakes shall be allowed

•Crate Motors ◦GM factory stock crate engine #s 88958604, 88958603, or 19258602.
◦ASA updates are allowed – i.e. Valve springs – keepers – locks and 1.6 ratio rockers
◦Must have factory break-off bolts.
◦No “dry sump” systems allowed. “Wet” systems only, must use oil pan supplied with crate motor. No crankcase vacuum
systems allowed.
◦Stock-type water pump must be located in “stock” position.
◦GM HEI distributor and MSD Soft Touch Rev Limiter – # 8728 for HEI required. RPM to be set no higher than 6,600. NO
◦Stock-size fly-wheel or flex plate required – must be SFI approved

•Built motors ◦360 cu. In. +2% (367.6 MAXIMUM  – NO EXCEPTIONS)
◦Cast iron block and cast iron heads shall be mandatory. No aluminum or other exotic metals shall be allowed. Raised runner
heads shall not be allowed. Head combustion chamber must not be smaller than 64 cc. 23 degrees Chevy. 20 degree Ford
and 23 degree Chrysler
◦Valve lift shall not exceed .550 – to be measured at valve. No titanium, exotic metals or materials allowed
◦Flat tappet cams only. Lifters must be stock diameter. No offset lifter bores and no big block lifters. No roller cams. Roller
rockers and girdles are OK.
◦Gear drives ok
◦Not titanium or aluminum rods shall be allowed.
◦Stock-type water pump must be located in “stock” location
◦Stock-type, SFI approved harmonic balancer required.
◦Stock-size fly-wheel or flex plate required – must be SFI approved.

Fuel System
◦Alcohol or race gas allowed. E-85 pump fuel ok
◦A securely mounted fuel tank (Sprint car or midget type) with bladder shall be required for all cars in competition
◦Approved fuel cell may be used for gas and must be securely mounted under fuel shell.
◦Fuel lines and fuel filters must be securely mounted to chassis.
◦Fuel injection
◦Please call Ruby Mountain Winged Sprints officials before using an injection system
◦Must meet track requirements for engine noise – see web site for each track specifications.


•Aluminum or steel seats shall be mandatory. The seating system should provide lateral support on both right and left sides
•High back seats are recommended. High-impact headrests are mandatory. Headrest shall be of shock-absorbing material
behind the driver’s head and shall be a minimum of 1” thick. Full containment seats are recommended.
•Seats should be mounted in four (4) places to the chassis with a minimum 3/8” steel bolts and nuts. Each mounting hole shall
have a minimum 2” diameter mounting plate with a .060” minimum thickness.
•All cars shall be equipped with adequate seat belts, shoulder harnesses and crotch straps. It is STRONGLY recommended
that a 5-point hook-up with 3” belts be used.
•Window nets, right and left side is highly recommended. If used, must be quick release type.

Roll cage padding
•All chassis roll cage tubes and bars close to the driver’s head shall be padded with high impact approved roll cage padding.

•Steering wheel shall be the quick-release type
•Steering drag ling tether mandatory

Driver uniforms
•Driver’s uniforms, gloves, and shoes shall be mandatory. Nomex underwear and socks highly recommended.
•Head socks and or helmet skirts are recommended
•Neck collars are mandatory. HANS-type device recommended.

•SA 2005 or newer helmet required

*AGE RESTRICTIONS - minimum age for Sprint Drivers is 16 (sixteen) years of age.
•Throttle pedal shall have a toe strap and minimum of three (3) throttle return springs in the system with at least one (1) spring
attached to the butterfly shaft. ‘
•Battery shall be securely mounted. Must have a master switch to shut all battery power off. Must be reachable by tech or
safety people.
•Bar stop safety rod fasteners mandatory - If using all thread, the all thread must be tethered to chassis.
•Master switch for battery – handle or lever. Must be accessible from left side of car.
2014 - 360 Sprints Rules