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Posted By: minthess on August 04 2014 at 10:14:51 PM
Only as much as the deballing rule book allows. The best Ford design that dominates dirt late model racing that is way different than a sbc is illegal in sprint car racing. TBJ's Ford is still like reinventing the wheel when you look at the ocean of average clones its competing against.
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I sure don't read anything in the Knoxville Rulebook that says "only chevy allowed".
straight from their rulebook:
ENGINE RULES-
Only small block V-8 engines with the cam in the block and a maximum of 410.00 cubic inches of displacement (tolerance +/- 0.000) will be permitted. The formula 6.2932 x bore² x stroke will apply. Big block engines will not be permitted. The engine must be mounted in-line with the driver and the drive-line must pass beneath the driver on center through the driver compartment. Offset engines and/or offsetting the position of the engine will not be permitted. The engine block and cylinders must be machined from cast aluminum. Billet machined blocks and/or cylinder heads will not be permitted. Engines with the magneto and/or 3
distributor in a forward mounted and/or front mounted position must be approved prior to competition. Only normally aspirated engines will be permitted. Turbo chargers, super chargers and/or forced induction of any type and/or description will not be permitted. The maximum engine cylinder bore size shall be 4.165. All engine cylinder sleeves (inserts) must be machined from an iron and/or steel alloy. Titanium crankshafts, connecting rods and/or rod caps will not be permitted. Two (2) valves and one (1) spark plug will be permitted per cylinder. Cylinder heads must retain a traditional valve pattern. Rotation of the valves will not be permitted. Cantered or splayed valve cylinder heads must be approved prior to introduction into competition. Only steel connecting rods with a maximum length of 6.000 inches will be permitted. All oil pans must have an inspection plug. The inspection plug must be a #12AN fitting or 1.00" pipe plug. In the event that an engine does not have an inspection plug the oil pan must be removed for inspection prior to competition. Only throttle plate (butterfly) and shaft throttle body styles with round circular bores will be permitted. The maximum throttle bore as measured at the throttle plate (butterfly) may not exceed 3.000 inches in diameter. Slide plate, rotary cylinder, and/or other styles must be approved prior to competition. Carbon Fiber manifolds and/or any other injection type pieces manufactured from carbon fiber will not be permitted. (Does not include stacks). Only 16 fuel nozzles, utilizing two (2) per cylinder will be permitted. One (1) nozzle must be placed in the cylinder head and one (1) nozzle must be placed in the injector. A minimum of two (2) throttle return springs must be used to mechanically return the throttle to a fully closed position. Only magneto-type ignitions will be permitted. A single crank-trigger type system will be permitted as a backup ignition system. One (1) switch that alternates the current between the magneto and the crank trigger may be mounted to the dashboard within the driver’s reach. Multiple coil-pack ignitions will not be permitted. Steel and stainless steel headers will be permitted. Titanium headers will not be permitted.
Engines with cubic inch size up to 437 cu. in. will be allowed providing the following specifications are in place: 4.165" maximum Bore, 4.00" maximum stroke, 15 degree minimum valve to deck angle, 3.750" maximum intake face height from deck to valve cover rail
, 2 5/8" maximum injector stack diameter for at least 4 inches of the stack length for engines under 430.000 cu. in. 2 ½" maximum for engines over 430.000 cu. in. 1 7/8 "maximum header size from head to collector.
-12 Brodix heads are considered to be 15 degrees unless severely altered. (+ or - 1degree from 15 degree valve angle) 16, 18 and 23 degree heads are acceptable. Please contact us with any questions before building or purchasing these engines. These engines are not legal for World of Outlaw shows or the Knoxville Nationals.
LS engines: LS Engine
rules are provided in a separate package of rules available from approved engine builders. Approved LS engines are legal for the Knoxville Nationals.
In the event that there are new engine components and/or a new engine configuration they must be submitted for approval to Knoxville Raceway prior to being introduced into competition
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