Sponsored by OE Speed
NOTICE: Rules are subject to change without notice.
Cars must fit the spirit of the class. Final determination, if there is an issue, resides with the Event Director.
You can only enter Pro OR Street, not both. Make sure you choose the right class at the gate and get tech’d for the right class!
ET Limit for STREET CLASS ONLY
In order to keep the Pro level cars (7 seconds) out of the “Street” class, we are making an ET Limit on all “Street” subclasses in KOT4, All Blower, 6r80/10R80, and Driver Mod. The ET limit in street class is 8.50 with a .1 breakout. You can run a 8.39 in qualifying but it won’t be counted. You must have one pass in qualifying 8.40 or slower to qualify.
King of the 4v is a racing class for all vehicles equipped with a late-model modular based V8 overhead cam 4V powered vehicles with a license plate and insurance.
Qualifying Information, Ladder Type & Tree
All Run Qualifying, NHRA Pro .400 tree, Heads-Up, 1/4 mile, Courtesy Stage (Encouraged)
We have two classes: Pro and Street. When you register, you’ll need to specifically state whether you are Pro or Street prior to your first qualifying pass. You can’t dual enter this class for Pro and Street with the same car.
MINIMUM WEIGHT/WEIGHT BREAKS (ALL WEIGHTS INCLUDE DRIVER)
Pro – 3000lbs with driver
Street – 3300lbs with driver
*Manual transmissions deduct 150lbs
Engine must be a Modular/Coyote 4.6/5.0/5.4/5.8 based V8 Ford engine. Internal modifications are permitted.
Pro: Any cooling system permitted. In cab intercooler tanks permitted along with under the hood and trunk.
Street: Radiator required. Any radiator, water pump and cooling fan/fans permitted; Cooling system must be contained inside the engine compartment. Intercooler ice tanks are allowed under hood and in the trunk only.
Any header size/tubing permitted. Open headers, down pipe permitted. Bumper/Fender exit permitted.
Pro – Any fuel system permitted and fuel location permitted.
Street – Fuel tank must be OEM and in OEM location. No aftermarket fuel cells allowed.
Pro – All fuels permitted.
Street -Unleaded or E85 only (One Ethanol, Ignite Red, or Similar).
Pro – Wet and dry oiling systems permitted.
Street – OEM Wet sump only.
Pro – Air intake coolers and/or ice boxes allowed in passenger compartment. Trunk mounted ice tanks permitted.
Street – OEM style intake intercoolers or Air to Air intercoolers permitted. Trunk mounted ice tanks permitted.
OEM or Bolt in 8.8 or 9 inch
Pro – Any transmission permitted.
Street – OEM Factory style overdrive transmissions only (6R80, 4R70, 4R100, 10r80), factory manual transmissions (TR6060, T56, Magnum XL, T45, MT82), and TH400 permitted.
Aftermarket K-Members permitted, but must attach to the chassis using only the original factory OEM type mounting bolts in the factory mounting location. Motor plates ok. No part of the K-member may be permanently attached to the chassis. K-member may be modified in oil pan area to allow oil pan enlargement or removal.
OEM or tubular stock type control arms required which must be attached in stock location.
OEM or aftermarket shocks/struts/springs permitted. May use coil overs.
Stock type suspension may utilize aftermarket, direct replacement type suspension components including aftermarket replacement shocks, springs, coil overs and/or control arms. All stock type 3-link and 4- link suspensions must maintain stock lateral angles and attachment points, but may be moved up or down on rear axle. Aftermarket torque arms permitted. Stock-type, ladder bar, and racing 4-link rear suspension systems are permitted (Pro Cars only).
Street – If OEM Equipped.
Pro – Permitted.
Street – If OEM Equipped.
Pro – Permitted.
Street – Prohibited.
Stock, unaltered frame rails required. Sub-frames may be joined under car. If connector protrudes through floor, floor must be completely welded to connector. Stock front/rear sub-frames must remain stock, unaltered, and in stock location.
TIRES & WHEELS
Pro – Spindle mount wheels permitted
Street – Spindle mount wheels prohibited
Pro – Dash can be aftermarket fiberglass, or carbon fiber as long as factory appearing. Passenger seats NOT required. If Kirkey or other Aluminum seat is added, it must be properly secured to a harness bar or cage. Aftermarket front seats are permitted. Rear seats may be removed.
Street – Must have factory dash. Full carpet. Passenger seats required. Aftermarket front seats are permitted. Rear seats may be removed or have a rear seat delete. If Kirkey or other Aluminum seat is added, it must be properly secured to a harness bar or cage. If ballast is used, it must be secured to prevent movement in all directions (including roll overs). All of these items will be thoroughly check before each round.
Pro – OEM steel (fiberglass/composite if OEM equipped) body shell required. Aftermarket body parts are permitted as long as factory appearing and are limited to hoods, front bumper covers, fenders, doors, and rear deck lids. Hood is required. Any rear wing permitted.
Street – OEM steel shell required. Aftermarket parts are permitted as long as factory appearing. Hood are mandatory. Must have functional headlights and turn signals.
WINDSHIELD & WINDOWS
Pro – OEM glass or NHRA approved Lexan is required and must maintain a Ford OEM appearance. Optic Armor windows are ok. Braces allowed. If carbon fiber/fiberglass doors are used Lexan windows with supports allowed.
Street – Lexan front or rear glass permitted. Side glass needs to be OEM glass.
Stock, unaltered firewall required.
Trans brake, 2 step, and aftermarket ECU permitted.