2008 - 358 Steel Head Modified Motor Rules
1. Block

a) 2008 Engine blocks Chevrolet or Dart

b) Comp Series Dart little (M) No. 31131111

c) Bowtie cast iron blocks 10051183, 10185047 or stock block allowed.

d) Bore size of 4.00 to 4.060 plus or minus .005

e) No Angle cutting of Block Deck

f) Block must be mounted within 2” of centerline of lower ball joints and have securely bolted mounts

g) No Tilted blocks

h) Min 2” ground clearance on oil pan

i) All blot holes and bores must remain in OEM location

Crankshaft
a) Standard steel magnetic production design crankshaft only. 2008 Minimum of 48lbs with 2.100 rod journal 2.448 main journal. Undersizing of crank journals permitted to .040 providing rod bore is 2.225.

b) Stock stroke of 3.480 only. Tolerance of +.005 - .010

c) Counterweights must be same shape as original OEM Mass production crankshaft use with this block

d) Leading and trailing edges may be round nosed or Knife edged only.

e) Mains & Rod journals may be drilled.

f) Outside diameter of counter weights may be drilled or machined or ground for balancing

g) No undercut or tapered counterweights. Counterweights must be same width from main and rod journals to outside diameter of counterweight

Rods
a) Solid magnetic steel only

b) Maximum length 6 inches

c) No stainless steel, aluminum, titanium or any other materials on or in rods

Pistons
a) Flat top, dished aluminum round pistons and Dome pistons permitted.

b) Must have three functioning ring grooves

c) Maximum overbore or 0.060

d) No ceramic, plastics or any other materials on or in pistons (aluminum only)

Heads 2008 Steel head Engines
a) GM Bowtie casing 14011034, 14011058, or 12480034 only.

b) Dart Platinum No. 10310010P

c) Valves Maximum size intake 2.05 exhaust 1.60

d) No repositioning of head on block. Stock location only

e) Valve centerline and guide angle in relationship to heads must be as OEM stock.

f) Porting and polishing by the removal or grinding of the original casting in runners is permitted. NO Epoxy fillers, welding spray welding or any other coating or materials on or in heads.

g) External painting is allowed.

h) No air directional devices on any valve surface.

i) Push rod and valve springs must be steel only – no titanium.

j) Valve spring retainers can be titanium.

Maximum compression is 12.0:1 NO TOLERANCE

Cam / Lifters
a) Cam and bore, lifters and bores must be in original location.

b) Lifter steel only, solid or hydraulic with roller tappets or mushroom tapers only

c) Rev kits permitted.

d) Roller rocker, stud girdles, shaft rockers allowed.

e) No gear drives or belt drives permitted.

f) Roller cam bearings permitted.

Ignition
a) HEI, MSD, or magneto allowed must be mounted to driver right and in plain view.

b) 6ALN MSD box only. All MSD boxes will be subject to a claimer of $325.00.

Refusal of claimer will result in loss of points earned to that point and no earnings for that event.

c) Distributor must mount in stock location. Rotation and firing order must be OEM stock.

d) No adjustable timing controls permitted.

e) No ignition parts in driver’s side area—must be mounted to driver right and in plain view.

Intake manifold
a) The following manifolds are legal:

i. Brodix HV 1000

ii. Edelbrock 2975 / 2999 / 2925 / 2926

iii. Bowtie 2972 / 2996

iv. Weiland Team G 7530 / 7532

v. Holly 300-25

vi. GM 10051102 / 10093374

vii. HVH 10003

viii. DART No. 42411000

2008 Intake Manifolds Maybe Ported. No welding or Epoxy fillers allowed.

b) No painting or coating.

c) Intake manifold gasket max thickness is .125

d) No Spacers between intake manifold and heads.

Carburetor
a) Holley 4777 650 CFM only.

b) No internal or external modification allowed carburetor must remain stock.

c) Changing power valve accelerator pump and jets is allowed but must be same as OEM.

d) Choke plate and horn may be removed. Gasket ring area must remain stock.

e) Boosters must be stock size and location but can be aligned.

Carburetor Spacer
a) One piece. Maximum thickness is 2 inches. No taper or bevel shape, spacer must conform to base of carburetor and use 2 paper gaskets that are no more than 0.065 thick each.

b) Spacer must position carburetor over original mounting position on intake manifold.

Air Cleaner
a) Round dry type diameter between 12 to 14 inches and between 1 ½ to 5 inches in height, top and bottom of air cleaner housing must be round and solid with the exception of the carburetor opening.

b) All air that enters engine must pass through air cleaner. No devices of any kind will direct or duct air to or from filter.

c) Filter must be centered on carburetor

d) Shield up to one half air cleaner circumference is allowed on front of air cleaner.

e) No performance enhancing additives or chemical on or in air cleaner or anywhere else.

12. Engine Lubrication
a) Dry sump systems recommended.

b) No oil, tanks or lines in drivers compartment.

c) Maximum stages of pumps is 5. Max length 10 inches x 3 ½” across.

d) No oil deflecting of individual rod or main journals.

e) Oil coolers allowed. If mounted above interior sheet metal must be no larger than 5w height and 10w wide. Outside edges of cooler must be sealed with sheet metal.

f) No partition oil pan of any kind. Oil pans subject to tech approval.

g) 1 inch inspection plug must be placed in bottom of oil pan for inspection.

13. Engine / Car Electrical System
Ignition System

a) Approved ignition systems may be used in competition. If the crank trigger ignition system is being used, triggering devices or pick ups will not be permitted inside o f the distributor housing.

b) Ignition amplifier boxes and RPM limiters that are analog only which do not contain programmable, computerized, or memory circuits will be permitted.

c) Magneto systems will be permitted.

d) The distributor must mount in the stock location and maintain the same firing order as a factory produced engine for the make and model engine being used.

e) Crank trigger ignition systems will be permitted.

f) Ignition system equipment or wiring may not be located in the driver’s side door area. All ignition system equipment must be mounted to the driver’s right.

g) Adjustable timing controls will not be permitted.

h) No ignition delay devices permitted.

i) RPM limiting devices must be approved by ROC Officials and be attached and wired to the ignition amplifier boxes in a visible manner.

14. Alternator

The alternator system, if used, must be working within specifications and mounted on the front of the engine.

15. Starter

The self-starter must be in working order. Gear reduction starters acceptable to ROC officials will be permitted. After the race is underway, cars may be started by hand pushing in the pit area only, but under no circumstances is any car permitted to be pushed onto the race track from the pit area.

16. Battery

The battery must be located between the frame rails. The battery must be located under the hood or floor of the car. If located under the floor, the batter must be completely encased, if located under the hood; the battery must have a suitable cover. The battery must not be forward of the radiator or rear of the housing of the car. The battery location must be acceptable to ROC Officials.

17. Electrical Switch Location

All electrical switches must be located on the dashboard panel or within easy reach of the driver. A labeled on/off master switch to the battery cable must be installed on the cowl behind the windshield opening on the right side of the driver. The switch must be easily accessible and in plain view.

18. Cooling System

a) Radiator must appear and work like OEM radiator and be centered in front of engine.

b) No cooling or icing type chemicals in engine compartment.

c) Mechanical water pump in stock location turning in same rotation of crank.

e) Coolant must flow in same direction as production engine.