Afton Motorsports Park Empire Sport Truck Class Rules
The Empire Sport Truck rules for Afton Motorsports Park are listed on this and three other pages, linked to below.
Page 1 of Rules: [Go to Page 1]Includes Eligible Trucks, Chassis, Rollcage, Engine Location, Weight and Body.
Page 2 of Rules: [Engine] [Fuel/Air] [Ignition] [Transmission] [Fuel Cell] [Exhaust] [Cooling System] [Batteries]
Page 3 of Rules: [Go to Page 3]Includes Rear End, Dirve Shaft, Brakes, Suspension, Steering, Tires and Wheels.
Page 4 of Rules: [Go to page 4] Includes General Build, Driver Attire and Miscellaneous.
[PDF of Empire Sport Truck Rules] [Download Adobe Acrobat]
These rules are posted here as convenience only. Not responsible for any type-O's or other copying mistakes. Call the track office if you have any questions. Make sure you read all safety and procedural rules outlined in the rule book.
The intent of the Empire Sport Truck class is to create an affordable, rear-wheel-drive option for rookies, and veterans to compete on an even playing field. These rules are designed to create equal opportunities for all drivers, and available makes and models, as well as drivers, to visit victory lane. These rules will not change significantly from year to year. EST or track officials have the final say as to whether something unspecified is legal.
- All internal engine components must remain stock OEM, unaltered as manufactured. This includes but is not limited to Rods, Crankshaft, Intake Manifold.
- Cylinder Head may be swapped to allow for carburetor.
- Camshaft must maintain stock lift. (.450 max, measured at the valve.)
- Engine must match make and model of truck.
- Does not need to match year.
- Pistons must be OEM Stock height and weight, and combustion surface must match OEM.
- .040 overbore maximum. No tolerance.
- Head may be milled .030 MAX. No tolerance.
- Engine Deck height must match factory.
- Cylinder head must remain stock. This means no oversized valves, no porting or polishing.
- The use of an older cylinder head may be used to convert from fuel injection to carburetion.
- No adjustable timing gears.
- Head may be shaved to "true" it for refresh, but keep in mind compression has to remain stock.
- Must run steel OEM flywheel.
- Flywheels may not be lightened.
- 185# compression max.
- May run carburetor no larger than Holley 350, or Box Stock Holley 500. Must pass ball test. May change jets and power valve. May remove choke.
- May use carburetor spacer no taller than 1".
- May use adapter plate or mild modification to intake for mounting of carburetor.
- No porting intakes
Fuel injected models
- OEM fuel injection must be used.
- OEM sized throttle bodies must be used.
- OEM sized fuel injectors only.
- ECU must be stock style, but computer chip may be used.
- May use adjustable fuel pressure regulator.
- 94 octane max pump fuel only. No alcohol. NO race fuel. Fuel will be tested.
- If your engine will not run on pump fuel, your engine is illegal.
- Must use stock ignition for that model of truck.
- May use aftermarket spark plugs and wires.
- May use aftermarket ignition coil.
- Must be stock!
- All gears must be fully operational.
- May use manual or automatic including stock, unaltered powerglide.
- No racing transmissions including TCI powerglides, Bert, Brinn, falcon, etc.
- Automatics must use a functional torque converter.
- Must use approved fuel cell.
- Must be encased in steel.
- Minimum 8" ground clearance.
- Aftermarket tubular headers are permitted.
- May run any type of exhaust.
- Exhaust must exit behind driver.
- May use electric or belt driven fans.
- May use any type of radiator.
- Radiator must be in stock location.
- Must have minimum 1 quart overflow tank securely fastened under hood.
- May use "water-wetter" additive or equivalent.
- Batteries may be mounted in engine compartment, or in bed area of truck.
- Batteries not allowed in cab.
- Batteries must be secure.
- All trucks must have main power disconnect within reach of the driver and clearly marked.