IGNITION & STARTING REGULATIONS
1. Any ignition system or magneto allowed. No traction control devices allowed.
2. Starters optional.
3. All flywheels must have steel or thick aluminum shield that covers at least 180 degrees of flywheels.
4. Recommended location for battery is under driver's seat. Dry cell battery ok as is.
5. Battery, if used, must be securely mounted and have protective covering (rubber) to prevent any acid spills during accidents.
6. All cars must have a clearly marked on/off ignition switch within reach of the driver.

FUEL
1. Alcohol or gas allowed. No Nitro or Nitrous Oxide, NO ADDITIVES.
2. Electric fuel pumps allowed, must have oil pressure cut off switch. Mechanical pumps recommended.
3. All fuel lines must have a 1/4 turn shut-off valve within easy reach of driver.
4. No oxygenated additives allowed.
5. Fuel cells and bladders must be approved by the manufacturer for their intended use. They must be enclosed in a container constructed of steel, aluminum, or fiberglass of a minimum .063 thickness, or other approved sprint car tail tank. It is highly recommended that the fuel tank have an adequate supporting structure under the forward section of the lowest portion of the tank. This structure should follow the contour of the tank and be welded or securely attached to the frame of the car on each side. When mounting the fuel tank to the chassis, all mounting points must have inner and outer plates attached to the shell. These plates must be of adequate size to insure the tank being secure to the chassis. All tanks must have a minimum of four mounts to the chassis. A flush-type cap is mandatory. The top access cover must be installed in direct contact with the fuel cell.
The lower portion of the tail directly under the fuel tank must be louvered or left open to allow fuel to escape if the tank is ruptured.
No plastic fuel lines. No plastic fuel filters. No spring type clamps.

CONSTRUCTION RULES:
1. Aluminum bucket type seats with hip supports and rigid back support. Mount with all steel components. The seat bottom must be mounted on the center line of the chassis within the frame rails.
2. All switches to be mounted above steering wheel, clearly marked "ON & OFF in an area on the dash easily reached by driver and safety crews, in plain sight. Toggle type only. Every car will have a master battery disconnect switch within easy reach of driver, and painted florescent orange, if car has battery.
3. All throttles must have toe return strap. All throttle linkage to be double sprung (separately).
4. Batteries must be enclosed to retain acid in the event of a rollover. The containers are to be of strong enough material to hold battery in place at all times and securely strapped.
5. All cars are to have a total firewall and floorboard that extend to front of seat. Minimum of 1" by .095 torque tube strap by seat.
6. The revolving part of drive shaft must be completely enclosed by a steel or aluminum tube with a minimum 1/8" wall thickness. Tubing may move up and down with rear-end.
7. Side nerf irons must be built of material strong enough to get the job done. Front and rear bumpers must have contact point 18" to 20" from ground and be built strong enough to get the job done. Rear bumper must extend a minimum of 2" behind tires. Contact point not to be less than 6" in height. Bumpers must not extend more than 4" beyond frame width.
8. Hoods, tailpieces, and side panels are required. Bodies must not exceed more than 2" outside frame rails and floor must extend to it. Hoods must cover radiators. Side pods legal to cover radiators and coolers. Bodies must be Sprint car or Modified type and securely fastened. No full bodies. The tail tank and the cars body work must be on the center line of the chassis. The driver shall be seated directly behind the engine and on the center line of the chassis.
9. Cars must have a leak proof burp tank of one gallon capacity or an overflow tube may be run into exhaust collector pipe 3 feet, from the final exhaust. Radiator fan must have 280 degree shroud, width of the fan.
10. No mirrors allowed. Exhaust muffling required 100dB @ 100ft.
11. Brakes. Yes. Hydraulic and foot operated. Must stop car...SAFELY!! Copper Tubing is not allowed any where on car. Two brakes on the front axle and at least one brake on the rear for asphalt cars only.
12. Frame rails to be straight and rails to be inside of wheel. Driveline and driver to remain inside straight frame rails. Main frame rails must be constructed of minimum 1 1/4 od x .120 wall, or 1 3/8 od x .095 wall" thick steel tubing. Multi tube frame rail construction accepted if of equal strength.
13. All main roll bars must be constructed of steel tubing 1-1/4' OD with .120" wall thickness or 1 3/8" OD with .095" wall, minimum. No threaded couplings allowed! Other material may be used but must be equivalent in strength. Cage must be securely bolted or welded to main frame. Main roll bar must be diagonally braced behind the driver. Diagonal braces in balance of cage must be of same type of material but not necessarily the same OD. The Safety Inspector reserves the right to drill a 1/8" hole for inspection.
14. No 4 wheel drive. No front wheel drive. All cars limited to an 84" wheel base, minimum. The center line of all engine blocks can not be behind the center of the wheel base.
15. Post race tech for tread width will be measured with a straight edge at center line of axle on right rear tire to the center of the rear end. The crank shaft will determine the center of the rear end. 43" maximum for upright sprints. The outside of the right rear wheel can not be more than 43 inches from the center line of the chassis. Offsets and or rear engine cars with greater than 43" will be limited to 2400 sq. in. wing. This rule can be re-visited at any time by majority vote of upright sprint car owners.
16. Torsion bar suspension allowed. Coil over suspension allowed. NO INDEPENDENT SUSPENSIONS ALLOWED!! Driver adjustable weight jacks and spring perches allowed. Rack and pinion steering, OK. Front end can not be wider or more offset than the rear end. Any car using a lug-nut type right front hub must use at least 5 lug-nuts. No cockpit adjustable shocks.
17. Quick change type center section allowed. Open tube rear-ends allowed.
18. Wings must be securely mounted and neatly numbered. Top wing surface or surfaces are limited to a total of 25 sq. ft. Side panels limited to 30" vertical height and length not to exceed beyond 12" total past the front and rear top surface. 1" gurney lip maximum. Nose wing limited to 6 sq. ft. Offset, and rear engine cars are limited to 2400 sq in top wing and 500 sq in nose wing. Maximum length or width of 72 inches.
19. All cars limited to 4 tires. No dual wheels.
20. Open to all types of wheels, no limitations. Bead locks recommended on all four wheels. Right rear wheel must have a bead lock of sum type on outer bead seat. Wheels must be approved racing wheel by manufacturer.

WEIGHT LIMIT
1. Weight limit set at 1625 lbs., with driver in the car. The outside of the right rear wheel as measured with a straight edge at center line of axle, cannot exceed 43 inches from the centerline of the rear axle center section. The outside of the left rear wheel as measured with a straight edge at center line of axle, cannot be less than 31 inches from the centerline of the rear axle center section. The outside of the right front wheel cannot be more than 43 inches from the centerline of the chassis.

Modified Rules
1. Any car not complying with the sprint car rules may race if they comply with the modified rules as follows:

* Driver can not be located any further to the left than a line drawn from the inside bead of the left front wheel to the inside bead of the left rear wheel.
* 2400 sp. inch top wing. 500 sp. inch front wing.
* Same engine and safety rules as sprint cars.
* Max 86 inch width outside right rear tire to outside left rear tire.
* Modified cars may be restricted at discretion of board.
* Sprint cars not complying with sprint rules must race under modified rules.
* Rear engine cars must run under modified rules.

If you have a car and it does not appear to fit any of these rules, call us and we will let you know if you can run it, motors must be legal, no exceptions. No stock car type cars allowed. Modifieds, Roadsters, Offsets, or what ever they are called, are the exceptions to the rules, but will be allowed to run with INSCA. Modified car rules may be changed and or restricted at the discretion of the board at any time.

TIRES
Tires must be run exactly as they are manufactured. No soaking, heating, sipping, or grooving is allowed. Tires to be run will be American Racing Modified Asphalt of a 132 compound for RR, other 3 comers compound is optional between, M28,131,M30,132, or M32. Tire that you qualify on will be run in the main. Visiting cars will have a one race grace on three corners, RR is not an option. Ephrata legal cars can run their own tires, or our tire. RR tire must be run for at least two main events, and may be replaced at the boards discretion.

Tire Sizes:
CIR Front CIR CIR
23.5/10.0-15.S - -75 24.5/10.0-15S - -78 25.0/11.0-15S - -79
L/R R/R
25.0/13.5-15S - -80 27.5/14.0-15S - -87
25.5/13.5-15S - -82 27.5/17.0-15S - -87
26.0/13.5-15S - -84

ENGINE RULES:
(Engine rules to be locked in for three years, until 2007)

1. Any American or Canadian piston type engine allowed. 360 cubic inch. No aluminum blocks. At the start of the 2007 season, No after market blocks except those grandfathered in.
2. Any Dodge, Ford, or General Motors cast iron cylinder head allowed WITH EXCEPTIONS:
North American only, no roll over heads. Cylinder heads must be stock, cast iron production only, limited to two valves per cylinder. Older Chevrolet bow tie heads allowed, cast # 25534421, 25534431, 25534351, and 25534371 Bow Tie heads are not allowed. Any stock production cast iron head may be permitted on Ford models, with prior approval of manifold and heads by INSCA Chief Steward.
All Chrysler cylinder heads and manifolds will need prior approval by INSCA Chief Steward. Performance cylinder heads such as, but not limited to, Dart, Edlebrock, Eagle, Brodex, World, Pro Topline, Pro Lightning, New GM Bow Tie etc. and limited production cylinder heads are NOT permitted. All GM heads must have 23 degree valve angle. Ford, Mopar must be stock degrees from factory production.
3. The maximum of three-angle valve job is permitted. When cutting the valve seat angles, no stone, cutter or grinding marks are permitted above the bottom of the valve guide. All cutting in reference to the valve job must be centered off of the centerline of the valve guide. Upon completion of the valve job, the bowl area under the valve seat down to the bottom of the valve guide must still be the same configuration as far as shape and finish as it was from the manufacturer. Surfaces and/or edges where the stone or cutter has touched must not be polished, smoothed, or radiused.
4. No hand or CNC grinding, milling, or polishing is permitted on any part of the head. Angle milling port matching or grinding of any type is not permitted. The heads may be surfaced/milled only to true the gasket surface. Chemical milling or porting is not permitted. No alterations may be made to the bowl, port, or runner area. Internal polishing, porting, removal of metal, and/or any other kind of modification will not be permitted.
5. All valves must be identical in appearance and construction as an OEM type valve. No air directional devices or holes will be permitted on any valve surface. The maximum valve sizes as measured across the valve face are as follows:

General Motors:
Intake-2.055" Exhaust-1.625"

Ford Cleveland:
Intake-2.055" Exhaust-1.656"

Ford Windsor:
Intake-2.055" Exhaust-1.625"

Chrysler:
Intake-2.055" Exhaust-1.625"

Titanium valves are not permitted. Titanium valve spring retainers are permitted.
6. All engines: Flat tappet or hydraulic cams. No mushroom or roller cams. OEM lifter, make to make i.e. Ford to Ford. Flattop type pistons only. NO Pop-up pistons allowed. No part of the piston may exceed the top of the deck of the block.
Roller Rockers allowed.
7. Any single 4 bbl or multiple of two 2 bbl carburetor combination, any fuel injection 2 3/16 maximum bore, no down nozzles, maximum of 8 nozzles mounted on intake portion of manifold only, no timed fuel injection, no turbo chargers, no super chargers.
8. Any aftermarket crank or steel rods allowed. No stroker cranks. No aluminum or other exotic metal cranks or rods allowed. Piston Bore not to exceed 60 thousands over a 4 inch bore. Or 360 cu in. +or- 1%

9. Dry sump oiling system allowed. Keep oil coolers away from driver.
10. Gasoline cars will be marked with a G on bobtail and wing and alcohol cars with an A in same location. This is, to help aide the safety crews, should we have a fire.
11. NO ANTIFREEZE! WATER ONLY!
12. Headers allowed. Muffled to a minimum of 100 dba @ 100' at start/finish line.
13. Engines may be pumped for size and cars may be weighed for compliance at any time at the discretion of the Race Director.