Sportsman Rules
This division is intended to be an entry level, affordable Late Model Division.
Body Rule:
Lucas Oil Series Body Rules
Engine A: 604 or 602 GM Crate
Must remain stock as they came from GM. Must remain as listed in GM technical manual p.n. 38958668. FasTrak and Durrence Layne specs are legal. Rebuilt motors are allowed. Seals not required.
Weight: 604- 2350lbs minimum
602- 2250lbs minimum
Engine B: 362 max cubic inches
Weight: 2400lbs minimum
Block:
GM Cast Steel Block. No aftermarket blocks.
One- or two-piece rear seal, no block lighting, no splayed main caps
All Components must remain in stock location
No raised or oversized cam journals
No oversized lifters. (.842)
Max bore 4.065 Stock. stroke 3.480
Heads:
Any Steel GM 23-degree head
Steel aftermarket heads allowed – add 25lbs.
Angle milling allowed, not to exceed 1 degree
All heads must remain as cast
Steel or Stainless-Steel valves only – no titanium or other materials
Undercut stems allowed – no hollow stem
Max valve size 2.02/1.60 must remain
11/32 stem diam.
No bump stop type valve stem seal
60cc minimum limit on combustion chamber – 195cc max limit on intake runner
No porting, polishing, grinding excessive deburring in any breathing area
No shot peening, no media blasting
Heads may be deburred on outside areas only
Valve spring pockets may be machined – Max spring pressure 105lbs at seat
Multi-Angle valve job permitted machine cut only
Max .900 below seat measurement to start at bottom of second angle or 45 degrees
No hand blending allowed
All angles must remain concentric with valve guide
May be machine for push rod clearance
No shaft style rockers, stud style only
No raised runners Intake Manifold:
Intake must be cast aluminum
Porting or polishing not allowed
Two-piece manifolds not allowed
Intake manifold must be cast with no spacer plates between the head and the manifold itself. No fabricated intakes.
Rods:
Steel Rods – 5.700 Length only
I-Beam Style – Press fit pins or floated rods
No titanium or aluminum
Piston Flat Top 2 or 4 valve pocket style
Oiling Systems:
No dry sump
No vacuum pumps
No external pumps
Crankshaft:
Steel – stock stroke (3.480)
Minimum weight 48lbs. with key & front timing gear Balancing o.k.
Cam – Lifter:
Hydraulic Only Max Valve Lift .460″ – checked at push rod
0.842 lifter diameter only
No mushroom lifter
No ceramic lifter
No roller lifter
Cam bearing journals must be OEM (1.868) Timing
chain only, no gear drive, no belt drive
Carburetor:
ENGINE A OR B
One 4-barrel 4150 style, gas or E-85.
Distributor:
Any ignition
No traction control
No crank triggers
Electronic boxes buy rule $300
Headers:
No “Tri-y” style allowed. All headers must be standard 4 into 1 style.
General:
Stock front clip cars will receive 50lb weight break.
All pumps and pulleys must be mounted in the standard location on the engine.
Rear-end mounted power steering pump ok. Add 25 lbs.
No bell housing mounted pulleys. No electric fans.
No adjustable suspension devices mounted in the driver’s compartment. Brake adjusters are permitted.
Shocks: Oil or gas, must be non-adjustable, no external reservoirs permitted, shocks may be steel or aluminum. Any shock may be claimed for $200 coil over kit not included. No shock covers.
103” wheelbase minimum – 1” tolerance
Any drive shaft – must be painted white
Standard steel axles only, no titanium axles. Axles may be solid, or gun drilled.
Hubs must be standard style aluminum or steel. No lightweight hubs. No magnesium or liquid filled hubs permitted.
Brake rotors must be steel. No lightened or cut rotors. Brake rotors can be solid or drilled.
All suspension components must be made of steel or aluminum, no titanium or carbon fiber parts.
Rear radius bars must be solid, no spring rods.
Transmissions must be steel or aluminum. Must have working forward and reverse.
Tire Rule:
604 crates and Sportsman
LF,RF, LR 21,55 or American racer 48,56 RR 55, or AR56. NO PRO 3’s allowed.
Wheels:
– 14” wide maximum – Steel or Aluminum only.
No treating or soaking of tires in order to alter the compound of the tire is permitted.
NO FUEL BURN OFF
General Rules:
1. Tires must have all numbers and name on the tire. No grinding off numbers or names.
2. Engine set back will be 6 inches from center of top ball joint to the most forward spark plug – ½” tolerance
3. Weight may be added at the discretion of track officials
4. Any gasoline will be allowed. No alcohol. E 85 gasoline will be allowed.
5. Weight and motor must be posted on right side A pillar (example, B-2400#, 602-2250#, etc.) *Claiming of incorrect weight/motor combination will result in immediate disqualification.
Protest Rules:
$1300 Complete Tear Down
$1000 Going to the winner of the protest.
$300 Going to Tech.
$400 To remove 1 head and check head bore and stroke.
$150 To check cam.
*602 and 604 will be teched as it came from GM.