- The CRS Stock Classes (Performance Stock and CRS GT)
were created to provide a lower cost form of competition by using basically
stock engines and low cost cars. The following rules have been made to
limit the effectiveness of expensive horsepower/drivetrain modifications
and should be maintained as such to keep the class a “drivers class”.
By keeping certain items “stock” and other modifications limited,
dominance of the class by one particular type of car will not occur. This
concept is referred to as the “Spirit of the Class”, and may
be applied by the Stock Class Committee in cases where the following rules
may not apply.
- In general, THE CARS ARE TO BE STOCK IN ALL ASPECTS
EXCEPT THOSE ITEMS SPECIFICALLY MENTIONED IN THESE RULES!
- Optional equipment will be allowed only when the
specific option was available on the body style as delivered in the
U.S. from the factory, except as modified in section 5.2 of these
- Dealer-installed options are not allowable. (Many
examples of these types of modifications exist and do not fall within
the “Spirit of the Class”).
- These rules are modified every other year (2005, 2007,
etc) by ballot after a Stock Classes meeting, to be in effect for the
following year. As a result these rules may change for 2006 but not for
2007. Current competitors in the class will be eligible to vote.
- All cars and trucks competing in the Performance Stock
Class will be limited to a market value (for the basic car) of not more
than $4,000. Vehicles in this class are limited to 4 cylinders or less
or two rotors. The number of valves or ports must remain stock.
- Vehicles equipped with turbochargers, superchargers
or four wheel drive will not be allowed in Performance Stock Class.
- If the value of the car is in question, it will be checked
via the current wholesale Blue Book with no additions or deductions for
optional equipment or mileage (or general market value). The first year
that the engine-body-induction system combination was offered for sale
by the manufacturer will be used to determine the value of the vehicle.
Updating and Backdating
- A model is defined as a specific body style, i.e. Mitsubishi
Galant or VW Golf. When within a model line a turbo or 4 wheel drive option
exists, all parts unique to the turbo / 4 wheel drive cars may not be
used on a Performance Stock Class vehicle. Example: Brakes on a Mitsubishi
Eclipse GSX may not be used on a GS.
- Other than the restrictions of 3.1, any part may be
updated or backdatedfreely within a given body style, provided that the
part was available from the factory on a production car sold in the U.S.
Example: Parts from a 93-95 VW Golf (Golf III) may not be used on a 85-92
VW Golf. However, parts from a ’91 Golf II may be used on an ’85
- Engine updating and backdating is allowed with the following
provisions and must comply with Section 4. In addition updating and backdating
may cause the basic value of the car to change (see section 2.3).
- The combination of body, engine, induction system
and exhaust manifold must have been available in the U.S. from the
- Fasteners, including but not limited to nuts, bolts,
studs and locking devices, nylocks, cotter pins are unrestricted as long
as they remain made from a ferrous material.
- Internal parts are free with the following exceptions:
- Stock block must be retained in the stock location.
- Dome-topped pistons are not allowed unless they
were stock on the specific body.
- The stock induction system meaning the intake manifold,
carburetor, or fuel injection system and exhaust manifold must be retained.
However the stock intake and exhaust manifolds may be modified. The stock
carburetor may be rejetted. The choke mechanism may be removed or fixed
- The rest of the exhaust system is free, but must include
a suitable muffler.
- The air filter and housing is free.
- The ignition system must be of stock design with the
following exception. Breaker points may be replaced by an electronic trigger
that remains in the distributor and does not include an MSD style ignition
- Motor mounts are unrestricted as long as they remain
in the stock location.
- Engine oil coolers, transmission coolers, and radiators
may be added or upgraded.
- Fuel pumps and pressure regulators are unrestricted.
- Four cylinder, piston type engines equipped with carburetors
and fewer than 4 valves per cylinder will be allowed the following modifications:
- The exhaust manifold is free.
- The stock carburetor may be replaced with an aftermarket
carburetor (on the stock intake manifold), provided that the total
cross sectional area of the throttle body bore at the interface with
the intake manifold is less than 2.85 square inches. Any carburetor
with a 32mm primary bore and a 36 mm secondary bore will meet this
requirement. Likewise any carburetor with two 34 mm bores (or less)
will also meet this requirement. Competitors utilizing an aftermarket
carburetor will be required to provide documentation demonstrating
compliance with this requirement to the Stock Class Chairman the first
time the car is entered in competition.
- Clutch and flywheel are free.
- The transmission shall be stock for the body style.
Ratios available in any year of the same body style may be used.
- Any differential ratio may be used. The differential
itself may be open, welded, locked, or limited slip.
- Brake lines may be rerouted and rubber hoses may be
replaced with aeroquiptype material.
- The rear axle assembly, meaning the housing, differential
and axles is free providing: brakes of the same type and size are retained.
Example: a ‘68-’73 Datsun 510 equipped with a R160 rear differential
may use the larger R180 differential as long as it mounts in the stock
location and no suspension components are altered.
- Strengthening of stock parts and mounting points is
allowed, however modification of the original part in the process is not
allowed. As an example, a suspension arm may have additional material
welded onto it, but it may not be lengthened or shortened in the process.
Wheel mounting bolts may be changed to wheel mounting studs.
- Limit straps may be added.
- Springs and shock absorbers are free in the stock location.
- Adjustable competition struts in the stock mounting
location may be used. The spring perch height and diameter may differ
from the stock dimensions.
- Sway bar size is free in the stock location, or may
- Strut mounting holes may be slotted and/or offset bushings
may be used to modify camber. Control arms may NOT be modified (except
- Brake pad and shoe materials are free, using the stock
caliper or drum assembly as equipped by the manufacturer. Modification
or removal of brake backing plates is allowed.
- Flexible brake lines are free.
- Wheels and tires are free.
Body - Exterior
- Underpanning and structural reinforcing are allowed.
- The stock hood latches and trunk latches may be modified
or replaced. Hood vents may be added. Hood scoops are not allowed.
- Fenders may be cut to remove a maximum of one inch from
the outer edge around the wheel well to allow for tire clearance. Fender
flares may be added over the stock fenders.
- Gas tanks are free as long as they meet safety requirements.
Fuel lines may be rerouted and rubber hoses may be replaced with aeroquip
- Electrics are free (alternator size, battery location,
- The material, construction and mounting method of bumpers
are free (both front and rear bumpers are required by state law).
- Roof vents are allowed.
Body - Interior
- Door panel upholstery material may be substituted or
modified for clear-ance of roll cage bar door bars. Sheet aluminum or
carbon fiber are not acceptable replacements.
- The steering wheel is free.
- The front seats are free.
- The following items may be removed: center console,
rear seat, rear deck cover, headliner, carpets, associated padding and
sound deadening material, radio, speakers and air conditioning. Heater
must remain operational through stock plumbing.
- The dashboard may be modified to accommodate safety
and rally equipment only.
- Prior to each CRS Rally, all competitors in Performance
Stock and GT classes are required to present their vehicles for inspection.
The inspection may be a group or individual activity as dictated by the
Stock Class Chairman.
- A group class inspection will be supervised by the
Stock Class Chairman. Questions of class compliance will be handled
on the spot by vote of the class competitors present. As simple majority
- An individual inspection may be suggested by the
Stock Class Chairman in which each competitor is personally responsible
for the inspection of all cars in the class. Similarly, each competitor’s
car must be available during the prescribed inspection time frame.
Such inspections will require the competitors to fill out and / or
sign a form indicating that they accept the legality of all cars competing
in the class. This form will also allow the questioning of any item
on any car. Inquiries will be investigated by the Stock Class Chairman.
Any discrepancies to the rules will be voted on by the competitors
as overseen by the Stock Class Chairman. All inquires must be submitted
by the deadline, and all inquiries should be processed prior to the
start of the rally.
- The Stock Class Chairman is responsible for coordinating
the GT and Performance Stock Class tech inspection.
- The burden of proof of eligibility is on the competitor.
A shop manual, presented by the competitor, will be used during inquiries.
Lack of shop manual will result in forfeiture of inquiry.
- Competitors found to be in violation of the above rules
will be placed in CRS-2 or CRS-5 or Open 4wd for CRS points purposes.
- If a competitor wishes to file a claim concerning rule
9.1 above, he should contact the Stock Class Chairman (SCC). The SCC will
form a claims committee including himself and two other people who are
not competing in the class at that event.
- Failure to attend the Stock Class inspection will result
in being moved to CRS-2 or CRS-5 (for Performance Stock Class cars) or Open 4wd
(for GT cars).
For more information on these rules or for clarifications,
Jon Rood, Stock Class Chairman