SECTION 12 LIMITED SPORTSMAN

 1.    LMSC Body and chassis rules apply.

1.    Body specifications 1992 and later body must have stock appearance.   

2.    All body panels must be steel except for LMSC approved parts.

3.    Body and chassis should conform to NASCAR LMSC Rules.

4.    Older model stock frame and metric chassis allowed.

5.    No adjustable shocks permitted.

6.    No cambered rear ends permitted.

7.    Brakes LMSC guidelines.

2.    Wheelbase-One side must be 105” plus or minus 3/8” on the other side.

3.    Max. tread width 64 ½”.

4.    Weight: Sealed Crate 3000 total, 1350 right side with driver in car.

5.    Weight: Unsealed crate engine: 3200 total, 1450 right side with driver in car

6.    Built engine:  3100  total, 1400 right side with driver in car

7.    Weight must be posted on right front top of door

8.    All add on weight must be painted white and be in block form of no less than five pounds with car number clearly labeled on it.  Weight must be bolted with no less than 3/8” bolts lock washers.

9.    Minimum frame height 4” to be measured with driver in car.

10.    All other chassis and ground clearances see LMSC guidelines.  Engine location and height see LMSC guidelines.

11.    Crate engines may run the 390 cfm 4150 series model #6895 and 4150 h.p. series model #80507 carburetor.  The choke horn on model #6895 may be removed with a square cut, no taper or bevels, but may not be cut into the body of the carburetor.  The air filter ring must remain standard.  All parts not covered in the proceeding rework guidelines must remain stock.  This includes the metering blocks and the fuel bowls.

12.    The built engine must run the 350 cfm carburetor, aluminum spacer plate, and gaskets by LMSC guidelines.

13.     All boosters must be safety wired

14.    Approved crate engines:

1.    G.M. #10185072 (ZZ3)

2.    G.M. #24502609 (ZZ4)

3.    G.M. #88958603

4.    4.Chrysler #5249499 (Magnum 380)

5.    Ford #M-6007-A351

6.    Ford #M-6007-A351R

7.    Ford #M-6007-D351R

15.    The engines listed above are “Crate Engines” sold as over the counter engine assemblies. The engines listed above are the only “Crate Engines” that will be permitted at Ace Speedway during the 2008 season.

16.    The only parts changes or substitutions that will be allowed to the crate engine will be the oil pan and pickup, water pump, and distributor on engines that are supplied with a distributor from the factory.

17.     All sealed crate engines must maintain all factory internal parts and dimensions. Such as bearings, rings, gaskets, etc. Sealed crate engines can and will be disassembled for inspection as needed.

18.     Unsealed crate engine:  Only factory original direct replacement parts, as specified in each manufacturers listing of parts for their engine may be used in the repair or rebuild of the crate engine.  The only exception will be that direct replacement aftermarket piston rings, bearings (mains, rods, and cam bearings ) and gaskets will be allowed to be used in the repair or rebuild of the crate engine.  Absolutely no other aftermarket replacement parts may be used in the crate engine.  Absolutely no high performance parts (Aftermarket or factory OEM) may be used in the crate engine.

19.    Maximum overbore on the crate engine is .035” including clearance and wear.

20.    Unsealed crate engines must have a minimum piston to head clearance of G.M. .050”, Chrysler .075”, Ford .060”.  This measurement will be the sum of the deck height (Piston to deck) and compressed head gasket thickness.

21.    Valve job limited to valve seat and valve only. No bowl cut or grinding below seat .

22.    Unsealed crate engines must have a minimum cylinder head combustion chamber size of 58 cc or greater for all engines.

23.    The heads on the unsealed crate engine may be machine cut beside the valves only, to equalize the chamber cc.  Any other machining or grinding on the cylinder head will not be permitted.

24.    The camshaft on the crate engine must remain stock as delivered in the engine from the factory. Factory specs will be tech item intake lift .474”, exhaust lift .510”. Duration and profile can and will be checked as necessary. No cam bushings allowed in factory timing gear.

25.    The following rules apply to built engines:

26.    Engine displacement will be as follows: G.M. 350 C.I. with a maximum .060”overbore, Ford 351 C.I. with a maximum of .060” overbore, Chrysler with a maximum of .060” overbore.

27.    The following characteristics of the production engine must be maintained in any engine used in competition in a manner acceptable to Ace Speedway Officials.  All parts listed below must originate from stock production castings and forgings that have been machined according to normal machining schedule utilized for standard production parts.  No coating of any engine parts including but not limited to ceramic or Teflon will be allowed.

28.    Engine blocks see LMSC machining guidelines.

29.    Crankshaft:  Only standard magnetic steel or cast production design crankshafts permitted.  If aftermarket crankshafts are used they must be designed and manufactured identical as an OEM crankshaft for the approved production engine.  Counterweights may be polished but they cannot be knife edged, undercut, or drilled.  The rod bearing journals may be drilled.  The main bearing journals may not be drilled.  See LMSC guidelines for weights.

30.    Only standard steel elastomer type harmonic balancers permitted.  LMSC guidelines.

31.    Pistons:  Only flat top pistons permitted.  No portion of the piston may extend above the block.  Pistons must have a minimum of three ring groves.  Piston rings must be in all three ring groves.  Only steel piston rings with minimum diameter of .927” permitted.

32.    Connecting Rods:  All rods must be made of magnetic steel, stock length for make and model of engine being used.  Rods may be stock or aftermarket magnetic steel rods providing all measurements are stock for make and model of engine.  Only stock rods may be polished.  Rods must be solid with no holes.

33.    Connecting rod length: G.M. 5.700”, Ford Windsor 5.954”, Ford Cleveland 5.778”, Chrysler 6.000”.

34.    Camshafts:  Only magnetic steel camshafts permitted.  No belt driven camshafts permitted.

35.    Cylinder Heads:  All cylinder heads must be NASCAR approved.  Cylinder heads must be standard production.  No aftermarket cylinder heads permitted.  No vortex heads permitted.  No aluminum heads permitted.  Chrysler W-2 heads not permitted.  Minimum 62 cc combustion chamber by LMSC guidelines.  Only three angle valve job.  Stainless steel valves allowed.

36.     Maximum Valve Size:

1.    G.M. 2.020 intake-1.625 exhaust.

2.    Ford Cleveland 2.046 intake-1.656 exhaust.

3.    Ford Windsor 1.8437 intake-1.5469 exhaust.

4.    Ford M-6049-N351 2.020 intake-1.600 exhaust.

5.    Chrysler 2.020 intake-1.625 exhaust.

37.    Rocker Arms, Valve Springs:  Roller rocker arms permitted,  Rocker arms must be independent stud type.  Single or double valve springs permitted.  Stud girdles permitted.

38.    Lifters:  Solid or hydraulic steel lifters permitted.  Lifter diameter and height must be standard for make and model of engine being used.  No roller or mushroom type lifters permitted.

39.    Intake Manifold.  Listed below is the only intake manifolds permitted.  The manifolds must remain as manufactured.  No port matching or flow work permitted.  Manifolds must not be painted or coated.  All numbers are current design Eldelbrock Performer Series intake manifolds.  Older design manifolds with the same part numbers not permitted.

1.    G.M. #2101

2.    Chrysler #2176

3.    Ford Cleveland 4bl. Heads #2665

4.    Ford Windsor #2181

40.    Air Cleaner (Built and Crates):  Only a round type rigid paper air cleaner maintaining a minimum diameter of 12” and a maximum diameter of 17” will be permitted.  All air must be filtered through this element.  The top and bottom of the filter housing must be solid with the same diameter.  Lips or expanded edges will not be permitted.  The bottom of the air filter must set level on the carburetor.  Tubes, funnels, spacers or any device which may control the flow of air will not be permitted.

41.    Engine water pump, engine oil system (oil pan), engine cooling fan, engine cooling system including radiator, engine exhaust system LMSC guidelines.

42.    Ignition System, Battery (Built and Crates):

1.    Any single or duel point camshaft driven distributor permitted.

2.    Electronic distributors permitted.  Must be stock type housing equipped with a magnetic pickup, gear driven, and mounted in the stock location.

3.    Only one ignition coil is permitted and it must be mounted on the engine side of the firewall.

4.    Only one electronic firing module amplifier box is permitted and it must be mounted on the right hand side of the dash panel.  Ignition boxes and RPM limiters that are analog only which do not contain programmable, computerized, or memory circuits will be permitted in standard ignition systems.

5.    Computerized, multi coil, dual electronic firing module amplifier box, or crank trigger systems are not permitted.

6.    Adjustable timing controls are not permitted.

7.    External RPM limiters are not permitted.

8.    All ignition systems are subject to approval by Ace Speedway Officials.

9.    Battery: Only one standard automotive 12 volt battery not to exceed 13.5 volts will be permitted.  The battery must be installed in an enclosed battery box complete with a cover.  It must be acceptable to Ace Speedway Officials.

10.    All electrical switches must be operable and be within reach of the driver.  The On-OFF master switch must be labeled and located on the front of the dash panel in the center.

43.    Drive Train:

1.    Multiple disc clutches allowed minimum diameter 7  1/4”.  5 ½ “  diameter clutches will be permitted with a 50 lb. weight penalty divided 25 lbs on the left side and 25 lbs on the right side. No direct drives allowed.  Hydraulic slave cylinders and release bearings allowed.  The clutch disc housing assembly may be made of aluminum or steel.

2.    Only a magnetic steel flywheel is allowed.  No aluminum flywheels permitted.  No holes may be drilled to lighten flywheel.

3.    Only standard factory OEM type starters permitted.

4.    Only standard production type four speed transmissions allowed.  All forward and reverse gears must be in working order.  See LMSC rulebook for rework guidelines.

5.    Driveshaft must be steel and painted white.  Only one piece drive shafts allowed.  Drive shaft must be a minimum diameter of 2 ¾”.  It is mandatory that two 360 degree steel loops not less than 2” wide and  ¼” thick be placed around the driveshaft and fastened to the cross member of the car, one in the front ½ of the driveshaft and one in the rear ½ .

6.    A magnetic or cast iron bell housing must be installed over the clutch and flywheel area.  A 2” hole must be drilled in the bottom as an inspection hole.  Cutting the bottom of the bell housing for weight reduction purposes is not permitted.

44.    Rear Axle:

1.    No Cambered rear ends permitted.

2.    Only steel axle housings permitted.

3.    Quick change rear ends allowed.

4.    LMSC guidelines.

45.    Tires:

1.    All tires must be purchased at Ace Speedway.

2.    One new tire may be purchased at each event.

3.    Tires Hoosier F45

4.    10” steel wheels.

5.    No bleeders allowed.

46.    For roll bars, seat, seat belt installation, fire control system, fuel cell installation see NASCAR rule book.  All cars must be equipped with a custom made aluminum racing seat.  Home made seats not permitted.  All cars must have seat belts and fire extinguisher installed in an approved manner.  All cars must be equipped with a quick release steering wheel.  Window net must release from the top with an approved lever type fastener.  Push button not allowed.  Fuel cell is mandatory.

47.    Any Items not covered in the above rules are subject to Ace Speedway approval.

Contact Robert Turner 336-585-1200 ext. 200.