MICKEY THOMPSON TIRES X275

X275 will run on the 1/8th mile .400 Pro Tree and qualify for a 32-car field (with Alternates) 32-car Pro Ladder. If less than 32 cars enter, we will follow the NHRA “Official Ladder” for the field size. Auto-Start is ON

X275 Radial Racers can follow the following Rule/Weight set completely or we also allow all
John Sears X275 legal combos at 2023 X275 at their exact Rules/Weights
(You cannot combine rules between the 2 rules sets, either the following or current x275 completely)

X275 CLASS GUIDELINES:

BODY:

The car must retain its original appearance and profiles. Aftermarket fiberglass parts are limited to hood, fenders, doors,

deck lid and bumpers, one-piece front-ends are allowed, but must retain factory appearing grill, head lights, and marker

lights. The driver and passenger doors must be fully operational and must open from the outside.

BRACKET RACING AIDS:

The use of bracket racing aids such as optical sensors, delay boxes, and throttle stops are prohibited

FIREWALL:

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

HOOD / SCOOPS:

Cowl & forward-facing hood scoops are allowed. Scoop or cowl may not exceed more than 9 inches at the highest point

of the air inlet opening above the height of the original hood flat surface.

INTERIOR:

All factory interior pieces including pedal assemblies must be in factory locations. Covered/Painted Door Panels & OEM

Appearing dashboard are required. Back seat may be deleted but must have carpet covering the bare floor.

LETTERING / DECALS:

X275-Radial Class sponsor decal (Mickey Thompson Tires) must be placed in the lower passenger corner of the front

windshield, SCSN Decals must be placed on both left & right sides of race car on the rear 1/4 Window, 1/4 Panel or Side

of Rear Wing in a highly visible location.

SEAT LOCATION:

Driver Seat must remain in the stock location.

CHASSIS / SUSPENSION

FRONT SUSPENSION:

All cars must retain stock suspension, aftermarket tubular control arms, coil over kits, or OEM front strut retrofits are

permitted. Replacement Bolt-on Lightweight K-Members are legal, but must be a direct bolt on, no welding

modifications permitted. Stock wheelbase will be enforced on all vehicles. You can weld tubes from your roll cage to the

front suspension.

**The only front suspension bolt-on kit deemed legal by the PSCA are the CHRIS ALSTON No Fab, AJE, HEIDTS, Smith

Racecraft and *FATMAN bolt-on kits (for 62-67 Nova’s, 67-69 Camaro’s & early Mustangs) Total Control Products Coil

Over Conversion Kits, and The Rod & Custom Motorsport Mustang II kit for 64 1/2-66 Mustang, DoubleAAPerformance

K-Member for G-Body, Part #RC-106 & Skinny Kid front end kits for late model Mustangs…. Kits must be installed as

instructed and not modified in any manner.

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:

Factory Frame Rails are required…. Bolt on traction devices are permitted. Leaf springs may be relocated for tire clearance purposes. Ladder Bar Type Suspension with Factory Frame Rails is legal, Aftermarket 4-Link setup with Factory Frame Rails is legal
with a 25lb weight add

FRAME & CHASSIS:

Stock frame rails must be retained in stock locations (NO EXCEPTIONS) front and rear. Notching of rear frame rails for

tire clearance is permitted. Sub frame connectors are permitted.

DRIVE TRAIN

AUTOMATIC TRANSMISSIONS:

Any OEM automatic transmission permitted. Aftermarket torque converter, shift kit, valve body, shifter, and pan cooler

use are permitted. Trans brakes are permitted.

MANUAL TRANSMISSION:

After-market clutch (single disc only) assisted manual transmissions are allowed (See Weight Penalty’s)

Clutch/automatics or planetary transmissions are not allowed. Split sliders are also not allowed. All shifts must be made

manually without the aid of electric, hydraulic or pneumatic devices. Any manual transmission built by an automotive

manufacturer, with stock case and gears will race at same weight as an automatic transmission entry.

ELECTRONICS:

Boost and Nitrous Controllers are permitted.

ENGINE:

650ci Limit for Big Blocks with a MAX Bore Space of 4.84 – 480ci Limit for Small Blocks with a MAX Bore Space of 4.40

ENGINE MOUNT LOCATION:

Engine must remain in stock location. Engine may not touch the factory unaltered firewall. Motor plates are permitted.

HEADS:

Aftermarket cylinder heads, aluminum or cast iron are allowed (No Billet Heads Permitted except on Small Block Nitrous

& Small Block Turbo Combos), See Weight Ads below

NITROUS:

Any nitrous combo is legal but cannot be used with any other power adder except by I-6 Combo (See Weights Below).

SUPERCHARGER:

Any Roots (Up to 12.71) or Centrifugal MAX 4.5 Inducer Diameter) Equivalent or smaller with the following specs must

be approved by the PSCA before being deemed legal:

MAX Inlet Hose Diameter 5.00″

MAX Inducer Diameter 4.50″

MAX Exducer Diameter 6.75″

MAX Outlet Inside Diameter 3.59″

TURBOCHARGER:

Accepted Single Turbochargers: 94mm Single Turbochargers are permitted on

V6 and Small Block V8 engines in accordance with the following

requirements: 1) Turbocharger must be of conventional impeller and

housing design and type. 2) Turbocharger is limited to a maximum size

of 3.701 inches (94mm) inducer diameter at the point where the leading

edge of the compressor wheel meets the inlet housing. 3) Compressor

cover inlet is permitted a maximum inlet diameter of 3.792 inches

(96.3178mm) 4) Compressor Wheel to housing clearance must maintain a

maximum 0.091 (2.3114mm) clearance beginning from a) the leading edge

of the compressor wheel where it meets the inlet of the compressor

housing, to b) the transition point where the trailing edge of the

compressor wheel meets the volute. 5) All air entering the

turbocharger must pass through the turbocharger inlet. 6) Injection of

any liquid, gas, or any other substance into the inlet or exhaust

housing prohibited. 7) Compressor wheel contour must be continuous

features from the inducer to the exducer (no “stepped” wheels).

Accepted Single Turbochargers: 98mm Single Turbochargers are permitted on

V6 and Small Block V8 engines in accordance with the following

requirements: 1) Turbocharger must be of conventional impeller and

housing design and type. 2) Turbocharger is limited to a maximum size

of 3.858 inches (98mm) inducer diameter at the point where the leading

edge of the compressor wheel meets the inlet housing. 3) Compressor

cover inlet is permitted a maximum inlet diameter of 3.949 inches

(100.3114mm) 4) Compressor Wheel to housing clearance must maintain a

maximum 0.091 (2.3114mm) clearance beginning from a) the leading edge

of the compressor wheel where it meets the inlet of the compressor

housing, to b) the transition point where the trailing edge of the

compressor wheel meets the volute. 5) All air entering the

turbocharger must pass through the turbocharger inlet. 6) Injection of

any liquid, gas, or any other substance into the inlet or exhaust

housing prohibited. 7) Compressor wheel contour must be continuous

features from the inducer to the exducer (no “stepped” wheels).

Accepted Twin Turbochargers: 72mm – 67mm Twin Turbochargers are permitted on

V6 and Small Block V8 engines in accordance with the following

requirements: 1) Turbocharger must be of conventional impeller and

housing design and type. 2) Turbocharger is limited to a maximum size

of 2.637 inches (67mm) inducer diameter at the point where the leading

edge of the compressor wheel meets the inlet housing. 3) Compressor

cover inlet is permitted a maximum inlet diameter of 2.728 inches

(69.3114mm) 4) Compressor Wheel to housing clearance must maintain a

maximum 0.091 (2.3114mm) clearance beginning from a) the leading edge

of the compressor wheel where it meets the inlet of the compressor

housing, to b) the transition point where the trailing edge of the

compressor wheel meets the volute. 5) All air entering the

turbocharger must pass through the turbocharger inlet. 6) Injection of

any liquid, gas, or any other substance into the inlet or exhaust

housing prohibited. 7) Compressor wheel contour must be continuous

features from the inducer to the exducer (no “stepped” wheels).

FUEL / FUEL SYSTEMS:

Gasoline (Race Gas), Alcohol and E-85 are the only legal fuels permitted. Nitro-Methane is strictly prohibited

TIRES:

Front Tires: Must have a minimum tread width of 4.5 inches. Front tires do not have to be DOT approved.

Rear Tires: Mickey Thompson 275/60R15 (3754x) Drag Radials or M/T 3355R or any radial tire shorter and/or narrower

than the 275/60R15 listed

WHEEL BASE:

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

WHEELIE BARS:

Wheelie bars are not permitted (any type of device other than factory OEM frame/suspension/body parts used to

control a wheelie/wheel-stand in any way is also prohibited)

WEIGHT GUIDE

Base Weight (All weights are race-ready, car with driver)

4 Cly W/Any Power Adder………………………………………….2500 lbs

V/6-I/6 Nitrous…………………………………………………………..2600 lbs

V/6-I/6 Turbo or Blower……………………………………………..2900 lbs

V/6-I/6 Turbo or Blower W/Single Fogger Nozzle………….3100 lbs

Small Blocks W/Nitrous………………………………………………2600 lbs

Small Blocks W/Turbo (up to 80mm) ……………………………2900 lbs

Small Blocks W/Turbo (80.01 to 88mm) ………………………..3250 lbs (Mid-Frame, Y2K or GT47-88 3050 lbs)

Small Blocks W/Turbo (88.01 to 94mm) ………………………..3300 lbs

Small Blocks W/Turbo (94.01 to 98mm) ………………………..3500 lbs

Small Blocks W/Twin Turbo (up to 68mm ea) …………………3275 lbs

Small Blocks W/Twin Turbo (72mm ea) ……………………….3350 lbs

Small Blocks W/Supercharger (up to 4.090″ Inducer)……..3050 lbs

Small Blocks W/Supercharger (4.091-4.200″ Inducer)……..3200 lbs

Small Blocks W/Supercharger (4.201-4.500″ Inducer)……..3300 lbs

Big Blocks Nitrous up to 550ci……………………………………..2800 lbs

Big Blocks Nitrous 551ci to 600…………………………………….2900 lbs

Big Blocks Nitrous 601ci to 650ci Max…………………………..3000 lbs

WEIGHT ADDS & BREAKS:

Add 50 lbs. For Small Blocks using SC1, Brodix (BF 200 & 300 Series) Brodix (CV SP265 & SP330) All Pro (-2) Mast (Mozez) …..Similar Canted Valve and any Symmetrical Cylinder Heads will be evaluated on a case by case basis

Add 100 lbs. Small Blocks using Dart “Little Chief” CFE “SBX” or Similar Style Heads

Add 100 lbs. For Big Blocks Using any Canted, Splayed Valve, Big Chief Style Cylinder Heads

Add 25lbs. For After-Market Rear 4-Link Suspension (Must retain factory frame-rails)

Deduct 50 lbs. For Rear Leaf-Spring Suspension

Deduct 100 lbs. For Small Blocks less than 358ci

Deduct 350 lbs. For no Power Adder.

X275 REQUIRED CLASS DECALS: Decals will be available during Sign-Up at the SCSN Trailer

CLASS SPONSOR DECAL:

“Mickey Thompson” decal must be installed on base of windshield on the passenger side.

(Bottom left-hand side when looking at front of vehicle windshield)

SERIES PRESENTED BY SPONSOR DECAL:

“FuelTech” decal must be installed on base of windshield on the driver’s side. (Bottom right-hand side when looking at

front of vehicle windshield) Decals will be available during registration at the SCSN Event Trailer

SCSN TITLE SPONSOR DECAL:

“Comp Cams” Decal must be placed on the upper windshield in the center

SCSN SERIES DECALS:

SCSN Decals must be placed on both left & right sides of race car on the 1/4 Window, 1/4 Panel or Side of Rear Wing in a

highly visible location

CONTINGENCY AND CONTINGENCY SPONSOR DECALS:

To receive Contingency Monies from any of the listed Contingency Sponsors, you must have the correct product listed

and matching Contingency Decal for that product on your car for the entire SCSN Racing Event… Racers will be checked

for Products & Decals while be teched in and winners & runners-up again will be checked in the Winner’s Circle after the

conclusion of each event. Winners & Runner-ups failing to show up for this mandatory Inspection will forfeit all

Contingency Money that is owed!!!! All Contingency Decals may appear anywhere on the vehicle in a clear and

organized fashion. Contingency decals may not be overlapped or modified. Most decals are available at the SCSN Event

Trailer, but in the event the SCSN does not have the decals in stock, it is the racer’s responsibility to obtain the proper

decals to be eligible for the Contingency payout.

RACE DAY POLICY’S

FIELD SIZE & LADDER:

X275 will qualify for a 32-car field (with Alternates) and will be put on a 32-car Pro Ladder. If less than 32 cars enter, we will follow the NHRA “Official Ladder” for the field size….

TOW BACK & TOW VEHICLES:

All X275 entries can tow to staging lanes and to the track scales with a golf cart or other similar small tow vehicle. All carts will be subject to search by a SCSN Official at any time.

SCALES:

After each qualifying and elimination pass, all Outlaw 8.5 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.

ALTERNATING LANES DURING QUALIFYING:

Each X275 driver must alternate lanes during qualifying. If you choose to ignore this rule, your second consecutive pass in the same lane on the same day will be disqualified.

AUTO-START:

The Auto-Start System will be turned on with a 7-sec timeout

BYE-RUNS:

All vehicles must take the Tree & Scale for opportunity at Lane-Choice for next round

Once Your Vehicle Passes Tech Inspection, There Are No Refunds

PAYOUTS:

$2,500 / To Win

$500 / Runner-up

$250.00 / Semi’s

CLASS ENTRY FEE: $200 (Plus $80 Weekend Track Tech Card Purchased at

Racer Gate)