SAIKI

MODIFIED PRODUCTION

Class Description

MODIFIED PRODUCTION is a heads-up class for all types of normally aspirated (no power adder) vehicles based on 8 lbs. per Cubic Inch platform. Suspension, both front and rear must retain stock configuration. All cars compete on a maximum 275/60/15 Drag Radial tire.

Class Guidelines

BALLAST:

Permanently attached ballast may be added in a NHRA legal manner. Removable ballast for the purpose of classification adjustments is limited to 100 lbs. in a NHRA weight box.

BODY:

The car must retain its original appearance and profiles; headlights, running lights, grille, bumpers etc. Aftermarket Fiberglass
parts limited to hood, trunk and front bumper only (must be stock appearing).

LETTERING / DECALS:

Car lettering is limited to windows only.

FIREWALL:

Must retain factory unaltered firewall, in factory location. A cosmetic overlay is permitted.

HOOD / SCOOPS:

Forward facing hood scoops are prohibited, unless factory equipped. Fiberglass replacement hoods (cowl) are permitted. Cowl hoods are limited to 5 inches in height.

INTERIOR:

All factory interior pieces must be in factory locations. Factory door panels, headliner, carpet, dashboard are required. Back seat may be deleted, but must have carpet covering the bare floor.

SEAT LOCATION:

Two front bucket seats, or one bench seat with upholstery required. Seats must remain in the stock location.

WINDOWS:

Must be of safety glass. No Lexan permitted. The only exception will be the rear window of an El Camino or other truck for roll bar access. All front door windows must be fully operational.

BRACKET RACING AIDS:

The use of any bracket racing aids such as optical sensors, delay boxes, and throttle

stops are strictly prohibited

BRAKES:

The braking system may be upgraded to discs or larger drums. All cars must have front and rear brakes.

CHASSIS / SUSPENSION

FRONT SUSPENSION:

All cars must retain factory stock-type suspension. Front frame rails, radiator core support, and inner fender sheet metal must remain in stock location. (alterations for exhaust only) Aftermarket tubular control arms, coil over kits, or OEM front strut retrofits are permitted. But must be a direct bolt on, no welding modifications permitted. Aftermarket Racing Struts with spindle mounts or hub mounts designed for tube type front ends are prohibited. Stock wheelbase will be enforced on all vehicles.

K-MEMBER:

Aftermarket factory-replacement-type K-member permitted, but must attach to the chassis using only the original factory OEM-type mounting bolts. No part of the K-member may be welded to the chassis.

REAR SUSPENSION:

All cars must retain stock rear suspension. Bolt on traction devices are permitted. Sway bars may be deleted or added (This includes "weld in" anti-roll bars) Leaf springs may be relocated for tire clearance purposes. Shocks must retain original angle as factory equipped.

FRAME & CHASSIS:

Stock frame rails must be retained front and rear and be unaltered. Sub frame connectors are permitted. May be notched for tire clearance.

DRIVE TRAIN

AUTOMATIC TRANSMISSIONS:

Any OEM produced automatic transmission is allowed. Aftermarket torque converter, shift kit, valve body, shifter, and pan cooler use are permitted. No electric or air shifters permitted. All shifts must be made manually.

MANUAL TRANSMISSION:

Factory and Aftermarket manual transmissions are allowed. Clutch-less versions, Jericho, Liberty, or Lenco type transmissions are not permitted. All shifts must be made manually without the aid of electric or pneumatic devices. Also, clutch operation must be manual.

Please call if you have any questions.

REAREND:

Any factory type rear end is allowed.

ELECTRICAL:

The battery may be relocated. The charging system must be operative and the alternator must be mounted in the engine compartment. Electric fans allowed.

ENGINE:

OEM production engine Conventional heads only.

BLOCK:

Aftermarket cast iron production blocks are allowed. Aluminum blocks permitted only on vehicles that came factory equipped.

CAMSHAFT:

Any camshaft permitted.

CARBURETOR / THROTTLE BODY:

Carburetor limited to a single conventional (4150 type design). No dominator type carburetors allowed. Throttle body limited to a single 80 mm max. Duel throttle bodies legal if factory equipped however, they will be limited to a 80mm single mass air meter.

EFI:

(Electronic Fuel Injection) Factory fuel injection systems with the factory computer must be in use. Commercially available "plug-in" chips are OK. No DFI or aftermarket injection systems permitted. Laptops used in any manner (Tuning, Recording Data, etc...) in any EFI car is not permitted, with no EXCEPTIONS. Please call with any questions.

ENGINE MOUNT LOCATION:

Engine must remain in stock location, and must retain factory style engine mounts NO MOTOR PLATES ALLOWED Engine mounts may be solid. Engine may not touch the factory unaltered firewall.

HEADS:

Aftermarket cylinder heads allowed, but must retain the factory valve angle within + or -2 degrees. Welding, epoxy, raised ports, and exotic modifications are strictly prohibited.Porting allowed. Legal Heads must match corresponding FEL-PRO Intake Gasket.

FEL-PRO GASKET CHART

Commercially available, mass-produced cast aluminum single four barrel intakes are

permitted. No Dominator flange manifolds allowed. No sheet metal or other composite manifolds permitted. EFI may use a Composite upper manifold if factory equipped.

EXHAUST:

Production type mufflers are required. No collector inserts, or collector mufflers permitted. Modification or removal of muffler internals is prohibited (no gutting). Exhaust system must extend to rear axle of vehicle.

FUEL / FUEL SYSTEMS:

Gasoline & Race Gas only (No Alcohol or Nitro) The WCHRA reserves the right to check gasoline at any time during competition. The addition of chemical additives intended to alter the makeup of the gasoline for increased performance is strictly prohibited. During fuel check, a competitor must identify the brand of gasoline being used. The sample will be considered illegal if it does not match the baseline results (ex. color, dielectric reading +or-.2, and chemical tests) logged by WCHRA. Failure to pass fuel check is grounds for disallowance of the run during competition and disqualification from the event during eliminations.

IGNITION:

Programmable ignition systems permitted using a hand held programmer ONLY. At no time will a laptop be allowed in any MODIFIED PRODUCTION car. Crank triggers and 2 step modules are allowed.

OILING SYSTEM:

Dry sumps and external oiling systems are prohibited. The front cross member may be altered for oil pan removal. Vacuum pumps are acceptable.

ON BOARD DIAGNOSTICS / DATA RECORDERS:

Are permitted through the ignition system box (example..MSD Digital-7 Programmable) using a hand held programmer. At no time will a laptop be allowed in any MODIFIED PRODUCTION car.

RADIATOR:

An automotive-type radiator is required.

STEERING:

Rack and pinion allowed.

STREET LEGAL REQUIREMENTS:

All cars are required to have working headlights and tail lights (headlights doors must be fixed open or work manually or automatically on cars so equipped). Brake lights, turn signals are required. Headlights may not be removed for air inlet!

TIRES:

Front tires must have a minimum tread width of 4.5 inches. Front tires do not have to be DOT approved. Rear tires must be a maximum 275/60/15 Drag Radial.

MODIFIED PRODUCTION WEIGHT GUIDE:

Small Block- 8 lbs. per Cubic Inch

* deduct 100 lbs. for factory OEM production cylinder heads. (excluding LS1/LS2)

Big Block- 8 lbs. per Cubic Inch

*add 100 lbs. for legal aftermarket cylinder heads

Legal Heads must match corresponding FEL-PRO Intake Gasket

WHEEL BASE:

You must retain stock wheel base with a maximum variation right to left and front to back of one inch.

WHEELIE BARS:

Wheelie bars prohibited.

WCHRA Required Decals
Class Sponsor Decal
Sponsor decal must be installed on base of windshield on the passenger side. (Bottom left hand side when looking at front of vehicle windshield)

Event Sponsor Decal
Sponsor decal must be installed on base of windshield on the drivers side. (Bottom right hand side when looking at front of vehicle windshield) Decals will be available during registration at the WCHRA Event Trailer

Contingency Program & Contingency Decals
In order to become eligible for WCHRA official contingency program, You must be a member of the WCHRA. You can do this at the WCHRA Event Trailer during registration or on-line at the WCHRA Store. It is the racer's responsibility to obtain the proper decals from the WCHRA or the Manufacturer to be eligible for the contingency payout. All contingency decals may appear anywhere on the windows in a clear and organized fashion. Contingency decals may not be overlapped or modified.

RACE DAY POLICY'S
SCALES
After each qualifying and elimination pass, all cars must stop and weigh at the track scales. If you lose in eliminations, and your opponent fails to make weight you will be reinstated into the eliminations only if you made minimum weight requirements. If both cars failed to make minimum weight, both cars will be disqualified. It is the driver's responsibility to verify with each track scale, the weight of his/her car prior to each race day. There will 5lb error factor allowed.

Burn-Out Procedure:

MODIFIED PRODUCTION does not allow burn-outs across the starting line. You must complete and stop your burn-out without crossing the starting line.

TOW BACK & TOW VEHICLES:

MODIFIED PRODUCTION does not allow tow vehicles of any sort in the staging lanes. All MODIFIED PRODUCTION vehicles must drive to scales and return to pits without the aide of any other vehicle.

BYE-RUNS
All vehicles must take the tree, and run down the 1/4 mile.

All drivers and vehicles must meet current NHRA and track requirements.

For any other questions or more info on these rules please visit out website:

www.westcoasthotrod.com