2012 NLMS Chevy Engine Rules

1. Engine in car must match manufacturer of body used. Example: Ford Thunderbird must run Ford Engine: Camero must use chevy Engine: Dodge Intrepid must run Mopar Engine.

2. Chevrolet 350 cubic inch + .060.

3. Cast iron blocks ONLY. Factory production, GM Performance Parts,World Products, or Dart blocks as long as block remains same configuration of Stock Chevy blocks. NO lightening of any blocks allowed.

4. Must have stock oiling systems. No dry sump systems.

5. May have straps on stock main caps. After market steel

caps-straight bolt or angle splayed caps OK.

6. No oversize valve lifter holes.

7. Oil coolers - OK

8. Accu sump OK - Pressurized accu sumps OK

CRANKSHAFT

1. Crank must be factory stock stroke.

2. Stock stroke for engine used. 3.48" Chevy

3. Balancing OK

4. Cross Drilling OK

5. No knife edge or winged cranks.

6. Any after market forged steel or cast production type

crank stock stroke for engine used. No Billets. Minimum rod pin diameter 2.00 inch.

7. Crank weight 48 lbs. minimum Chevy engine.

CONNECTING RODS

1.Any forged steel Sportsman connecting rod with the following dimensions: 7/16 rod bolt, 5.7" Connecting rods not to exceed $750 cost.

“I” Beam Rods Allowed:

1. Crower Sportsman 5.7 SP93205B--8 5.7

2. Eagle SIR5700BBLW 5.7

3. K-1 CF5700ALLB 8 5.7

4. Manley Sportmaster 14101-8 5.7

5. Pro-Comp PC 4112 5.7

6. Scat 2-ICR5700-7/16 5.7

“H” Beam Rods Allowed:

1. Eagle CRS5700BLW 5.7

2. Callies-Compstar CSA5700DS2A2AH 5.7

3. K-1 CH5700-ALL BB 5.7

4. Manley 14050-8 5.7

5. Pro-Comp PC4131 5.7

2. May polish beams.

3. May use after market rod bolts.

4. No Titanium Rods - No Carillo Rods.

5. No profiling of rods, no cnc maching of center of beam,

no removing of manufacture name and rod size.

PISTONS

1.Any flat top piston.

ENGINE BALANCING

1.Engine balancing permitted

HARMONIC BALANCER

1.Any Harmonic Balance

2.Balancer may be pinned.

HEADS

1.Chevy, OEM or Performance cast iron heads, or NLMS Brodix “SPEC” Aluminum head, only heads permitted.

2.Milling heads accepted.

3.Multi angle valve job permitted

4.Maximum intake valve size 2.02”, Maximum Exhaust valve size 1.6”, Hollow Stem valves permitted.

5.NO titanium valves permitted

6.May use any valve spring, valve retainer, oversize valve stem, lash cap, any steel pushrod, screw in studs, guide plates,

stud girdle, any stud mount roller rockers. Stud must go thru center of rockers.

7.NO shaft mounted rocker systems

8.NO porting, polishing, gasket matching, or coating on inside of head runners. No Epoxing in runners. No short side radiousing.

Must be able to see and feel the defined raised lip of original bowl in the cylinder head, in all areas of the bowl, AND All bowl work must

Remain concentric with the valve guide, and NO machined or grinding work more than .650” below the 45 degree valve seat. Any

Work done more than .650” below valve seat will be deemed port work NOT part of the valve job. Any completely smooth blends,

of the bowl on the short side (even though you can see where the cutter stops) will be considered short siding, again must be able to

see and feel the defined raised lip of the original bowl.

9.NO altered or ground off casting numbers.

10.Chevy Vortec head permitted casting No’s. 12554290-10125320-12552520-13555690-10239906- & 062.

Total intake runner volume not to exceed 173CC. Total runner volume Exhaust runner not to exceed 64CC.

11.Chevy PhaseII cast iron bow tie head (new style), part number 1013492, casting number 140110034 allowed.

Maximum runner volumeon intake not to exceed 184CC.

12.New Chevy Vortec/Bowtie Head part #25534351 Ok. Maximum runner volume 186CC. Maximum Exhaust runner volume 69CC.

13. Dart Iron eagle 180 head permitted (part#’s 10110010, 10110010F, 10120010). 182cc Maximum intake runner volume, 77cc maximum exhaust volume. 2.02” Intake valve max, and 1.6” exhaust valve max. NO Machined cuts more than .700” below valve seat. NO Iron Eagle 200,215, or 200,215 Platinum heads allowed.

INTAKE MANIFOLD

1.Any cast iron or aluminum intake.

2.No porting, polishing, squaring/gasket matching of ports. When using NLMS SPEC aluminum heads, you may gasket match intake port opening no more than ½” (.500”) deep into runner. NO MATCHING ON HEAD SIDE.

3.May run 1” spacer

4.Turtle OK not altered

5.Total adapter not to exceed 1” total. Any thing mounted between carburetor and intake is considered spacer, and can not exceed 1” total.

6.Directional spacers OK.

7.All intakes must be from a recognized name brand intake manufacturer, ex Edelbrock, Brodix, Holley, Weiand, etc. MUST have manufacturers name and part number intact and unaltered. NO import manifolds allowed.

CAMSHAFT

1.Any flat tappet cam

2.Stock diameter lifters ONLY .842”, OEM size to make of engine, NO ceramic foot lifters allowed, all lifters must have a magnetic base.

3.NO roller cams or lifters

4.Cast iron stick ONLY, NO billet cams.

TIMING GEARS

1.Timing chain and gears ONLY

2.NO gear drives, or belt drives

CARBURETOR

1.One dual line, single pump 3310 Holly, with Vacuum sec. or Holley 80803 HP series double pumper. Only carburetors allowed for NLMS competition.

2.May remove choke butterfly.

3.Holley 3310 May drill idle holes in primary butterflies. There should be No half, or flat throttle shafts in the primary side of the carburetor’s base plate.

1.The primary throttle shaft, with a 172 butterfly should be a minimum of .1868” thick

2.The secondary round shaft, with a 172 butterfly should be a minimum of .1828” thick.

3.The secondary half or flat shaft with a 172 butterfly, should be a minimum of .1228 thick

4.Billett base plate allowed must meet factory Holly specs. On throttle bores, and above throttle shaft specs.

Note: Checked with go-no-go gauges

4.May install secondary jet metering plate, Billet metering plate allowed.

5.May NOT remove choke horn on 3310.

6.NO porting or polishing.

7.Ford 735 c.f.m. OK, Secondary Throttle screw OK.

8.Four corner idle OK.

9.Carbs checked with Go-No-Go gauges.

10.stock 3/8” inside diameter boosters 3310 & 80803 Holley. Down leg Boosters OK, must remain stock Holly specs.

FUEL PUMP AND FUEL CELL

1.Stock mount fuel pumps ONLY.

2.No electric or belt driven fuel pumps

3.Steel case on fuel cell recommended

WATER PUMP

1.Stock mount ONLY.

2.Electric fans OK.

IGNITION

1.Any battery operated.

2.No crank trigger ignition, & No Magnetos

3.NO Electronic Traction Control device!! MSD in Association with the NLMS are working together to eliminate electronic traction control.

MSD is currently developing a new ignition box that block traction control and has the capability to be checked via computer via computer to make

There is no traction control, and that the ignition box is working according to MSD specifications, and has not been tampered with. The new

Box will become Mandatory when available, and will become part of Post Race Tech This is new technology and WILL be implemented when

Readily available to all NLMS teams.

4. MSD Boxes may not be mounted in drivers cockpit. The trigger wiring Harness (ie. green and purple wires) must go straight from box thru firewall and follow along engine side of firewall, and be easily accessible for inspection. The NLMS reserves the right to inspect MSD boxes at any time, and the right to hold winnings and impound MSD boxes to be sent to MSD for inspection. MSD (Autotronic Controls Corp.) has agreed to work with the NLMS to prevent the use of Electronic Traction Control (ETC). If at any time an ETC is found it will be confiscated by the NLMS and SEVERE penalties will levied against the infracting team found to be using ETC.

RADIATOR

1.Must be close to stock location, mounted in front the motor.

STARTER

1.Must have operating starter.


	Download printable Chevy Rules (Click Here)