2005 NLMS FORD ENGINE RULES

 

HEADS

 

1.Sportsman M-6049-N351 or M6049-N352 heads allowed. NO after market heads. N351 head maximum intake runner volume 195CC.  N352 head maximum intake runner volume 188CC, and Maximum exhaust runner volume 69CC.  Combustion chamber volume either head, 62CC.  NO Tolerance.  Maximum valve size 2.02” intake, & 1.65” exhaust.

2.Cylinder head must be unported. 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.

3.Stud mount rockers ONLY, stud must go through center of rocker arm.  No shaft mount rockers.

 

BLOCK

 

1.M6010-D351, M351, or N351 are acceptable blocks.  N351 block will cost the racer the least amount money on machine work, and would be preferred.

 

April 29, 2005-- FORD ENGINE BLOCKS--Currently there appears to be a severe availabilty issue with Ford Motorsports and the availability of the approved Ford engine blocks.  NLMS officials, working in conjuction with several engine builders searched extensively, and exhausted every avenue to locate a source for the blocks, with absolutely no luck.  We have decided to allow Ford teams to use an aftermarket block simply because of availability.  Dart part no.’s 31384195, & 31385195 are approved to use.  World products part no.’s 087150, and 087152 are approved to use.  These blocks are in line with the blocks from Ford, on specifications, such as deck height, weight, and so on.  We feel there is no performance advantage to this block, just more readily available.  The Ford motor is currently the only make that can use the aftermarket block.  Part #’s and casting numbers must remain visilbe and unaltered, and all other rules apply.

 

CRANKSHAFT

 

1.Any cast or forged steel (No Billets) crankshaft must have a stock stroke of 3.50”, and weigh a minimum of 54lb.  No knife edging or winging of cranks.  Ford part #M-6303-G351 is a good place to start, The M-6303-G351 is to lite.

 

OIL PUMP

 

1.Wet sump oil system, or may use an external single stage belt driven oil pump.  Oil must be pumped from, and returned to oil pan.

 

CONNECTING RODS

 

1.Ansy forges steel “I Beam” sportsman style rod.  Maximum rod length 6.00”.  No profiling of rods, no cnc maching of center of beam, no removing of manufacture name and rod size.

2.Minimum Rod pin diameter 2.00”

 

PISTONS

1.Any flat top piston.

 

ENGINE BALANCING

 

1.Engine Balancing permitted

 

CAMSHAFT

 

1.Any flat tappet cam

2.Stock diameter lifters ONLY ..875”, 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

 

INTAKE MANIFOLD

 

1.Any cast iron or aluminum intake.

2.No porting, polishing, squaring/gasket matching of ports.

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

 

            CARBURETOR

 

1.One dual line, single pump 3310 Holly, with Vacuum sec.

2.May remove choke butterfly.

3.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.

6.NO porting or polishing.

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

8.Single pump ONLY.  No rear nozzles.

9.Four corner idle OK.

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

11.stock inside diameter boosters 3310 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.