Oct 15, 2014 09:44 AM EDT

2014 Empire 100 Street Stock Rules

Open to any American Made Car – 1960 or newer.

 

 In the event your car does not fit the rules, but you wish to compete, please contact Yates County Speedway ahead of time so we may make a determination on your car before you arrive.

 

CHASSIS - SUSPENSION & STEERING:

Minimum wheelbase 107” with 1” tolerance. Roll Cage must be constructed using 1 1/2 .095 tubing Min. 

Full frame cars can have rear frame from center of axle back replaced with 2x3 tubing.. 

Unibody cars can have the frame replaced with 2x3 tubing from 36” behind centerline of front wheels. 2x3 tubing must go over the rear end housing. Front frame on all cars can be replaced forward of the steering box and idler arm only (front steer cars) with tubing.

All suspension and steering components must be OEM and in stock mounting location unless noted otherwise.

Upper A frames may be replaced with a “steel shaft” tubular A frame. Aftermarket upper A frame 

mounts allowed in OEM location with a max. 1 inch tolerance. Control arm length of 9 inches MAX.

Lower front & rear control mounts must be in OEM location. Tie rod ends may be replaced with heim joints.

Stock configuration steel aftermarket non-adjustable upper a-arms are allowed.

Steel body shocks front and rear. Stock or alternate locations allowed. One shock per wheel (NO ADJUSTABLE SHOCKS ALLOWED) Max. allowable shock cost $100/ea., weight “jack bolts”, adjustable spring spacers allowed.

No pull bars, torque arms, pan hard bars or leaf/coil type suspensions. No three link rear suspensions.

Suspension bushings can be replaced with solid type rubber or steel bushings(NO MONO BALL TYPE)

Full Stock front clip must remain Unibody cars can have the frame replaced with 2x3 tubing from 36” behind centerline of front wheels. – NO fully tubed front clips allowed. NO LATE MODEL CHASSIS!

 

OPEN ENGINE RULES:

Engine setback is limited to the #1 spark plug even with the upper ball joint.

All engines must remain stock stroke for Mfg. and cu. in. Maximum cubic inch. GM 350+ .070 overbore; Ford 351+ .070 over bore; Chrysler 360 & G.M. 400 + .040 overbore; No stroker engine of any type. All G.M. 400's will run 1 + 11/16" Restrictor plate Stock item straight 4-hole, no additional machine work. 

HEADS: Stock cast iron / bowtie heads –  intake valve 2.02” – 1.5 exhaust maximum (exception: Ford/Chrysler maximum 1.6”. Allowable heads must have casting number. Vortec heads will have a max 1.94-1.5 valves. Vortec heads allowed are: No. 10239906, 12552520 & 12558062 . (No aftermarket or high performance Vortec heads). Non-Performance World Product Stock Replacement Chevy Heads allowed. Part numbers World 043600 or World 043610. Pined or screw in studs on heads are legal. Push rods, rocker arms & valve springs must be stock type. Any roller rocker allowed. Ball tip pushrods allowed. Any type lock nuts on rocker arms allowed. No shaft rockers. Stud Girdle allowed. Push rod guide plates allowed. NO FORD GT HEADS ALLOWED. No hand grinding, sanding, blending, or de-burring where a cutter or stone leaves off. 

Sand blasting, bead blasting, add dipping, porting, polishing, and welding are prohibited. 

NO race flow, cut down or none OEM valves allowed. Steel or aluminum roller rockers allowed. ( NO shaft rocker arm setups allowed, Except stock Chrysler OEM). Pump gas or standard race fuel only---NO performance enhancing additives or alcohol.

Any flat tappet cam or hydraulic cam. Flat top pistons only. NO piston may extend beyond the surface of block deck. Stock unaltered crankshafts or aftermarket equivalent only. Connecting rods must be stock steel I-beam unaltered up to 5.7”.  NO 6” rods allowed. 

NO lightning before balancing on rotating assembly. Balancing and weight matching allowed. Factory stock distributors, points, HEI only. Aftermarket replacement parts allowed. NO printed boards or traction control devices of any type allowed.

 

OPEN ENGINE CARBURETOR  RULES:

Factory stock two barrel or box stock Holley 4412, and for the 4412 to be legal it must pass tech by track tools.

NOTE track tools will not fit some Holleys, numbered 4412-S (may not pass tech)

Cast iron 2 barrel passenger type intake manifold, No marine or military type manifolds allowed. Aluminum intake allowed as follows: -Chevy: Weiand part #7547, 7547-1 & Edelbrock #5001,  #2101 or #2116 -Ford: weiand part # 7515, 7516 & edelbrock #5021, 5081, 2760 -Chrysler Weiand part # 7545 & Edelbrock #5076 -Chrysler w-2 heads Weiand # 2920

NOTE  Only two unaltered carb adaptors will be allowed: Part # BRP-377 & HV-301-1 or equivalent. With max thickness of 1 1/8” including gasket. ANY MODIFICATION TO ABOVE ITEMS WILL NOT BE LEGAL

NO sideways mounted carburetors.  No electric fuel pumps.

 

 

OPTIONAL 602 CRATE ENGINE RULES:

General Motors Spec. #19258602. I.D. plate must be accessible. Stock Rocker arms that came with motor only. 

OEM style fan and water pump.  No electric fans and clutch fans. No evacuation pumps of any kind. Mechanical, electrical or otherwise not allowed. Engines must pull a minimum of 19 inches of vacuum at idle.  Replacement valve spring part # GM10212811 – Must use HEI distributor that comes with motor.  Must have MSD Rev Limiter #MSD87286 with 6200 RPM chip. Rev box chip must face up and be taped into the rev box. This must be hooked up and working at all times. If found to be higher than 

6200 RPM chip or not working you will be DQ’ed.  MSD must be out of the reach of the driver. All wiring to REV Limiter box not permitted to be in a harness.  All wires must be clearly visible. Rev box must be under hood and be easily removed for tech purposes.  No Cockpit mounts. Must be out of reach of driver.  Rev boxes may be confiscated or swapped by speedway officials.

 

OPTIONAL 602 CRATE ENGINE CARBURETOR RULES : 

One 650 cfm Holley allowed. The only allowed part numbers are Holley 4777, Holley 80777,or Holley 4150Series 80541-1. 

must maintain stock venturie and throttle bore dimensions: primary venture 1 ¼”.  must remain stock in all respects. Booster height must remain stock (no cutting or polishing). No visible modifications without disassembly. Go/no go gauge measurements valid on hot or cold carburetor. Carburetor maximum height measured from bottom of carburetor base to machines horizontal gasket 

surface of block with 7” in both front and rear of block. Any other modifications not mentioned are not legal - Holes drilled in the throttle plates for proper idling - Drilling, tapping and plugging of unused vacuum ports. Welding of throttle shaft to linkage arm. Drilling of idle or high-speed air correction jets. Milling of center carburetor body metering block surface a maximum of .015” on each side. Removal of choke plate and shaft. The jets may be changed as needed.

 

TRANSMISSION: OPTION 1

Factory stock automatic or standard transmissions. All gears must work—Manual transmissions must have a full steel bell housing.

Forward and reverse must work with the engine running with foot on the brake. Factory stock steel flywheel and factory stock steel pressure plate housing, one clutch disc only. NO AFTER MARKET PRESSURE PLATE OR CLUTCH DISC.

Stock Size functional torque converter must measure min. 10.5-in. O.D. 

 

TRANSMISSION: OPTION 2

Falcon/Bert/Brinn Transmission: Falcon #60100 ONLY, Bert #BERLMZ ONLY, BRINN 70001 ONLY

or Automatics with Direct Drive Set ups may be used with an Open or Crate motor - No Ball spline type Transmissions . 

REAR SUSPENSION:

Coil cars must use lower trailing arms that meet OEM specs, length, location and have rubber or steel bushings.

Upper control arms may be fabricated and adjustable with heim joints. Springs must be located in stock location on the top of the rear end housing. Factory stock rearends or Ford 9" floater maybe used , Mounts must remain in stock location.

Ford 9" may use steel mini spool or full spool. Leaf springs allowed, Must be magnetic – adjustable sliders allowed.

NO pull bars, torque arms, pan hard bars or leaf/coil type suspensions. NO three link rear suspensions.

NO uniball  suspension  allowed in any location. NO traction control devices.

NO quick change, Detroit locker, Gleason, or Gold track rear ends.

 

BODY:

 Fiber glass roof and hood  allowed. Spoiler allowed, max height of 5”. Width no wider than then body. Open Hood Scoops allowed. Aftermarket front covers mandatory rear bumper covers optional. NO late model style down force noses allowed. (NO fiberglass).

Front and rear bumpers must be constructed of round tubing only no angle iron or channel iron allowed.

All exterior side rails, front and rear bumpers SHOULD have rounded edges and exposed bolts should be carriage bolts. 

Max body width will be 82”

 

WHEELS & TIRES:

Maximum 8” wide steel rims, any backspace, NO wide five Rims or hubs, No bead locks except on Right Front and Right Rear.

 American Racer 245-70-15  OR  American Racers Dirt Stocker MEDIUM tires 26.5/8.0-15dt, 27.5/8.015dt.   

 No Soft Compound Tires - Other manufacturer subject to track approval. 

Grooving, grinding and sipping are allowed. NO chemical treating of tires. Foam Tire Plug allowed on RF and RR only

 

 

 

 

BRAKES:

Car must have four fully functional OEM style calipers and rotors “ STEEL ONLY”. Balance bars are allowed with external adjusters.

 

FUEL SYSTEM:

A foam filled fuel cell in a steel container is mandatory with a max capacity of 22 US gallons.

 

EXHAUST:

Street type headers. Crossover headers allowed –NO headers or any part of the exhaust may be interconnected at any point. Exhaust must exit behind the driver. 1 5/8  or 1 ¾ headers.  NO 180 degree or step headers allowed.

 

WEIGHT OPTIONS:

A) 602 Crate Engine two (2) barrel Carb. standard transmission with stock steel flywheel and factory stock steel pressure plate OR regular automatic transmission with a functional 10.5” torque converter – Min. Weight 2900lb.s

 

B) Open Engine two (2) barrel Carb. standard transmission with stock steel flywheel and factory stock steel pressure plate OR regular automatic transmission with a functional 10.5” torque converter – Min. Weight 3000lb.s

 

C) 602 Crate Engine four (4) Barrel Carb (650cfm) standard transmission with stock steel flywheel and factory stock steel pressure plate OR regular automatic transmission with a functional 10.5” torque converter – Min. Weight 3000lb.s

 

D) Open Engine two (2) Barrel Carb, Bert, Brinn, Falcon or Direct Drive Automatic transmission – Min. Weight 3100lb.s

 

E) 602 Crate Engine four (4) Barrel Carb (650cfm) Bert, Brinn, Falcon or Direct Automatic trans. – Min. Weight 3150lb.s 

 

NO TOLERANCE. TRACK SCALES WILL BE USED TO DETERMINE WEIGHT! If you are found to be under weight you may request the head tech  be present to confirm the findings of scale personnel. Those findings will be final.

 

NO mirrors, two way radio or phone devises allowed. 

 

In the interest of fair competition YCS reserves the right to address any over competitive cars. 

Items not covered in these rules are at the discretion of Yates County Speedway Tech Officials.