2019 Sportsman LM
Sportsman Rules can be found going forward by selecting Drivers> Rules> 2019 Sportsman LM
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.
Fastrack 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 inch
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
Any Steel GM 23 degree head
Steel aftermarket heads allowed- add 25 lbs.
Angle milling allowed, not to exceed 1 degree
All heads must remain as cast
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.
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 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
No dry sump
No vacuum pumps
No external pumps
Crankshaft: Steel – stock stroke (3.480)
Minimum weight 48lbs. with key & front timing gear
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
ENGINE A OR B
One 4-barrel 4150 style, gas or E-85.
No traction control
No crank triggers
Electronic boxes buy rule $300
No “Tri-y” style allowed. All headers must be standard 4 into 1 style. No stainless headers. Header buy rule – $300
103” wheelbase minimum – 1” tolerance
Stock front clip cars will receive 50lb weight break
All pumps and pulleys must be mounted in the standard location on the engine.
No bell housing mounted pulleys. No electric fans.
No adjustable suspension devices mounted in the driver’s compartment. Brake adjusters are permitted.
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.
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 light weight 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. Ball-spline trans – add 25lbs.
Front Tire – Any
Both Rear Tires must durometer minimum 55 before qualifying and feature race.
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.
FUEL BURN OFF 1lb per lap with 10lb total tolerance allowed.
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.
*Drivers who have won a feature event in SLM or LLM competition at Smoky Mountain Speedway in the past two seasons are not eligible to compete in the Sportsman division. A driver is allowed to race in more than 1 class on the same night with different cars but must purchase an armband for each class.
Time limit on tear down must be done in a timely manner. Track official will monitor this. If the official declares that this has not been done in a timely manner, the track official reserves the right to dis-allow protest. Visual protest cannot be made after feature event.
The track reserves the right to confiscate any suspension or engine component to prove it’s legality.
The track reserves the right to amend, delete or change rules in the interest of competition.