Knoxville Raceway Announces 305 Sprint Engine Rules / Schedule Update
by Bruce Neimeth

KNOXVILLE, IA (Dec. 28, 2006) - Knoxville Raceway released the 305 Sprint Car engine rules and specifications today that will be used for all six of the scheduled race dates in 2007, including the April 27th, June 1st and June 15th, and the September 27th, 28th and 29th events. They are available at www.knoxvilleraceway.com  in the Rules heading as “2007 305 Engine Rules” for reprint, as well as in the News section.

The rules are a result of communicating with mid-states based 305 series, engine builders, components suppliers and most important, drivers and car owners. “It was evident that most of the engine rules are similar in the basics, but interpretation and application varies broadly. The biggest differential being in the heads and how they are prepared,” stated Ralph Capitani, Race Director. “Hopefully these rules will provide a middle ground that narrows the performance differences without any major expense to the competitors. We look for competitive and safe racing that is exciting to our fans that buy the tickets,” he continued.

According to John McCoy, Competition Director for Knoxville Raceway, “once we publish the rest of the rules covering chassis, running gear and safety equipment in mid-January, we will apply the methods and schedules for inspecting and “teching” that are used for all other sprint car classes and events to the 305 Sprint Car program. Our most important concerns will be safety first, and then providing a reasonably level ‘playing field’ for everyone.”

The application of the Knoxville Raceway engine rules to all six events is a change from the original schedule that only referenced using them for the 3-day Knoxville Mid-States 305 Championships. At the request of many competitors, the rules will apply to all six of the events, allowing teams to utilize them in freshening and updating their equipment prior to the beginning of the 2007 season.

The June 1st 305 Sprint Car event, running with the Masters Classic during the Annual National Sprint Car Hall of Fame Induction weekend, will pay $750.00 to win, while the 3-day Knoxville Mid-States 305 Sprint Car Championship payout will exceed $15,000. The April 21st and June 15th events will each pay $350 to win.

Knoxville Raceway hosts weekly events from April through September, including winged 305-, 360- and 410-cubic inch sprint cars, late models and midgets. Other special events include the 47th Annual Super Clean Knoxville Nationals, World of Outlaws Double Header, the 17th Annual 360 Nationals and the 4th Annual Lucas Oil Late Model Knoxville Nationals. Advanced reserved tickets for all special events are available online or at the ticket office.

For more information, please contact Bruce Neimeth, Director, Business/Event Development at brucen@knoxvilleraceway.com  or at (641) 842-5431.

2007 Knoxville Raceway 305 Sprint Car Engine Rules 12-27-2006

The following engine and related equipment rules defines a legal engine for competition at the Knoxville Raceway in 2007 at all 305 Sprint Car events including the April 27th, June 1st and 15th, and the September 27th, 28th and 29th events.

Knoxville Raceway employees will apply the same methods and schedules for inspecting and “teching” that are used for all other sprint car events.

The rest of the 305 Sprint Car rules covering chassis, running gear and safety equipment will be released by January 15, 2007, and can be expected to be consistent with these rules for all other sprint car classes that compete at Knoxville Raceway.

For questions and comments please contact Bruce Neimeth at: brucen@knoxvilleraceway.com  or (641) 842-5431.

1. Engine: 315.9 cubic inches (maximum bore of .060 over on 305 blocks).
2. Blocks: Stock Chevrolet 305 block (no bow-tie, dart, after market blocks) Canadian block okay. Approved casting numbers: 361979, 460776, 460777, 460778, 14010201, 1410203, 1408851 and 14016381. No lightning of block of any type; must retain entire factory casting.
3. Pistons: Flattop pistons. Valve relief piston is acceptable.
4. Crank: Stock Chevrolet cast-iron or steel crank; 3.480 or 3.500 strokes. No knife-edging or drilling, except to balance.  Stock weight 48 pounds. Aftermarket 48 pound cranks accepted.
5. Rods: O.E.M. Stock appearing I Beam or H beam only, 5.7 Chevrolet Rods. No Aluminum or Titanium. Oil pan inspection hole required to view rods. 
6. Drive: Double roller type chain; no gear or belt drive allowed. Short or long steel or aluminum water pump; must be in stock location.
7. Hub: Damper or steel hub. If damper is run must meet SFI-approval 
8. Cam/Tappets: Flat-tappet cam, stock-diameter tappets (no rollers, mushroom, radius type tappets) 
9. Oil Pump: Wet sump internal pump only (no crankcase vacuum systems. 
10. Rockers: Roller rockers allowed (no shaft system) 3/8" or 7/16" stock or screw in studs mount rockers. 
11. Valve Train: May run stud girdles, but no rev kits allowed. 
12. Lifter Boxes: May be machined or bushed for repositioning, alignment and straightening of lifter box. Original stock diameter bore must be maintained.
13. Valve Sizes: Maximum 2.02 intake and 1.600 exhaust sizes, 11/32” stock stem length (no altered systems).
14. Valve Spring Sizes: Maximum valve spring diameter is 1.460”.
14. Steel: The following must be steel only: valves, retainers, keepers, push rods, springs, tappets, crank, rods, wrist pins, fasteners, main caps. No titanium, composites or ceramics internal engine parts.
15. Heads: Any of the following Chevy steel head castings with are the only ones allowed; stock “305” Chevy produced head, World Product Head #042650, DART head #s 10110010F and 10310010F. Minimum combustion chamber is 49ccs; maximum 200cc intake runner. All of the above are to be UNTOUCHED meaning no machining, milling*, grinding, polishing, welding*, acid-etching, shot-penning, glass beading or any other process that alters the original production machined surfaces or natural casting finishes. The head must retain ALL original dimensions and configurations, including valves, stems and guides. Heads and/or head studs are allowed as long as they retain the stock diameter.
*The only work allowed is re-seating the valves (no under-the-seat relief cuts or enlarging the delivered throat size), Port-matching the intake to the head to a maximum depth of ½”, straight-cut milling to repair obvious damage and/or square the deck (no angle-cut milling for any reason).
16. Compression Ratio: 11: 1 is absolute maximum. Compression ratio will be tested using the Knoxville Raceway Whistler static engine compression meter.
17. Ignition Systems: Magnetos, Electronic or Kettering-type only (no crank triggers). No MSD Pro-Magnetos will be allowed.
18. Fuel Injection or Carburetion: Constant-Flow fuel injection or any four-barrel carburetor. Injection can be no larger than 2-3/16" If you are running a set of stacks they have to be straight 2-3/16” with no funneling or venturing.