| Friday, October 17, 2008 | |
SPORTSMAN/LIMITED IRON MOPAR ENGINE RULES
|
SPORTSMAN/LIMITED IRON MOPAR ENGINE RULES
Engine Setback is a maximum of six inches (6") from center of ball joint to front of most forward spark plug hole.
BLOCKS
1.360 Mopar production cast iron blocks permitted, also permitted is the Mopar performance cast iron “A” engine block or R3
block part #P4876792AB (59 degree valve tappet) or P4876672AB (48 degree valve tappet) is a good starting point These 2
blocks are the only performance blocks permitted All casting numbers must be unaltered and visible.
2.Block may ONLY have a Maximum cylinder bore of 4.030”.
3.Wet sump oil system ONLY. No dry sumps.
CRANKSHAFT
1.Any Forged steel or cast cranks ONLY. No Billets. Mopar performance crankshafts part #P5007253A is a good start. Must
have stock stroke 3.58”, 50lb minimum weight. Minimum rod pin diameter 2.100”. NO knife edging, or winging of crankshaft.
Balancing permitted.
CONNECTING RODS
1.Any forged steel sportsman rod, 6” maximum length, 7/16 rod bolts permitted.
2.NO Billet rods, or Carillo rods.
3.May polish beams, No profiling of cnc machining in center of beams.
4.Manufacturer’s name and Rod size must remain on rod.
PISTONS
1.Any flat top piston permitted.
HARMONIC BALANCER
1.Any harmonic balancer permitted
CYLINDER HEADS
1.Mopar W2 cast iron cylinder head permitted part number P5249769 (59 degree block) 180cc max intake runner volume, & 78cc
max exhaust runner volume. P5007445 (48 degree block) 190cc max intake runner volume, 78cc max exhaust runner volume, or
P5007445AB 196cc max intake runner volume, 78cc max exhaust runner volume, and casting numbers must remain on head
unaltered. 64cc mimimum combustion chamber volume. NO TOLLERANCE.
2.2.02” maximum intake valve diameter, and 1.60” maximum exhaust valve diameter. No Titanium valves, Steel or Stainless Steel
valves ONLY. 11/32” minimum valve stem diameter. Multi angle valve job permitted.
3.No porting, polishing, gasket matching, or epoxying of runners. No short side radiousing. No bowl work more than .500” below
45 degree valve seat cut. 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 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. Milling of heads of accepted, (note combustion chamber limit above)
4.May use any diameter valve spring. Any Valve retainer, 11/32” minimum valve stem diameter. Any Steel push rod. Steel Valve
keepers ONLY. Mopar may run shaft mounted rocker system.
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
CAMSHAFT
1.Any flat tappet cam
2.Stock diameter lifters ONLY .904”, 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.
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!!
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.
RADIATOR
1.Must be close to stock location, mounted in front the motor.
STARTER
1.Must have operating starter. |
|
