1. COMPETING MODELS:
A. 1996-2017 truck models with wheelbase of 110-112 inches.
B. Trucks with 108 and 109 inch wheelbase must add 25 lbs. to right side.
C. Tread width of 65 1/2 inches +/- 1/2 inch as raced.
2. TRUCK BODIES
A. Front and rear windshields must be lexan. No side or quarter windows.
B. Speedway approved window net must be installed in the driver’s side window opening.
C. Body height minimum 4 inches, roof height minimum 56 inches with driver measured 10” behind windshield. Rear Spoiler height maximum from the ground– 44”. ALL BODY HEIGHTS, ENGINE, FUEL CELL, AND REAR SPOILER HEIGHTS WILL BE CHECKED ON 4 INCH BLOCKS.
D. Rear spoiler 5” high with maximum 60” width.
E. Rear spoiler angle must be the same all across the spoiler.
F. Rear spoiler must be centered on the truck, no offset to one side.
G. No added materials to quarter panels behind the rear wheels.
H. Wrecker hookup required on front and rear of truck.
I. Rear bumper cover must be complete and fastened to the rear bumper bar. No cutting of bumper cover.
J. There will be a measurement from rear axle across quarter panel to farthest end of rear bumper and this measurement will be a maximum 51″ with 112” wheel base.
K. The only ducting allowed under the front of the race truck will be for the radiator. This duct work must not be wider than the radiator and must not extend past the radiator.
A. Tubing front sub frame allowed. Stock OEM front sub frame allowed.
B. Frame rails minimum 2”x 3” x .083 wall thickness between wheels.
C. Frames must be perimeter style. Front and Rear sub-frames must be centered to roll cage.
D. Chassis rails must maintain 4” ground clearance with driver.
E. Cage must have at least 4 door bars on both sides.
F. All bars must be as at least 1 ¾ inches x .083 tubing.
G. Driver’s door bars must be covered by steel plate.
H. Must have 1 ½ “ windshield bar.
I. All bars within driver’s reach must be padded.
J. Roll cage must be at least 43” tall as measured from top of roll cage.
K. The roof halo bar must be a minimum of 37” outside to outside. Anything less than 37” will have to add 25 lbs to right side
L. A steel interior must separate the driver from the engine compartment and fuel tank. A metal dash must be in installed in the driver’s compartment.
M. Floorboard may be raised ten inches to the drive shaft tunnel to the top of the door bar and seal off to allow clearance for headers. No boxed interiors.
O. A complete speedway approved roll cage.
P. Roll cage must be centered on the main frame rails. Perimeter style.
4. FRONT SUSPENSION
A. Coil-over suspension allowed.
B. Screw Jacks allowed on front and rear
C. Fabricated spindles allowed.
D. Lower A-frames may be Fabricated or aftermarket.
E. Front lower control arms may be strut rod.
F. Upper A-frames may be fabricated.
G. Front sway bar may be OEM or Aftermarket design.
H. No titanium suspension parts allowed.
A. Rack and Pinion steering allowed.
B. OEM type steering and steering box allowed.
C. Steering components may be aftermarket.
D. Any type of steering or power steering allowed.
6. REAR SUSPENSION
A. Three link, leaf spring or truck arm suspension allowed.
B. A metal fabricated pan-hard bar is allowed.
C. Damper shock permitted on rear suspension.
D. Rubber bushing, metal bushing, teflon bushings or heim joints allowed.
E. Three link lower trailing arms may be metal tubing.
F. Truck arms must be magnetic steel.
G. Rear sway bar not permitted.
H. No Titanium rear suspension parts allowed.
7. REAR END
A. Rear end may be car, truck, floater, or standard quick change.
B. No cambered rear ends. +/- .4 Grace. No aluminum tubes. No aluminum yokes.
C. Detroit Locker or spool only. No torque limiting devices allowed.
D. Only steel third members (9 inch chunks) allowed.
E. No titanium rear end parts allowed
8. SPRINGS and SHOCKS
A. Tie rod or spherical end shocks allowed.
B. Coil springs minimum diameter 2 ½”.
C. One shock per wheel. Coil over Eliminators allowed.
D. May use bump stops.
E. Shock claim rule is $175 per shock not including hardware.
F. To claim shock, driver or truck owner ONLY must turn in a written claim to the head tech man within 15 minutes of race completion. Must have cash in hand. NO EXCEPTIONS.
G. Failure to sell shocks will result in loss of money and points for that race.
A. Single or Multi piston metal brake calipers permitted.
B. Steel disc brakes may be used on front and rear. All 4 wheels must work.
C. No titanium brake parts allowed.
1. 602 CHEVY CRATE must run with a 390 cfm carburetor with no engine modifying of engine parts.
2. 603 CHEVY CRATE must run with a 390 cfm carburetor with no engine modifying of engine parts.
3. 602 AND 603 CHEVY CRATE must run with a 500 cfm carburetor when use rocker arm GM part # 19210724 and adjuster nut part # 88961233 or Scorpion 1.5 rocker arm part #scp1035 with matching adjuster nut. And replacing harmonic balancer with GM part #12551537. And when changing valve springs with competition Cam #2697516.
4. 604 CHEVY CRATE must run a 450 cfm carburetor.
5. Ford 347 JR CRATE must run a 500 cfm carburetor. The Holley Ultra XP 500 carb will be allowed on Ford Jr ONLY.
6. Ford 347 SR CRATE must run 450 cfm carburetor.
7. Ford, Chevy and Dodge late model stock built engines must run a 450 carburetor
8. 70CC engines must run a 500 cfm carburetor.
70CC engine rules :
A. Only stock production engines allowed. Chevrolet 350, Ford 351. Chrysler 360 cubic inches are maximum allowed plus over bore.
B. No coating or polishing inside of block.
C. Overbore of .060 + normal wear permitted.
D. Aftermarket solid steel connecting rods permitted. No polishing or machine work will be permitted.
E. Flat top 3 ring pistons permitted. Piston must not extend above top of block.
F. Crankshaft with stock stroke must be retained. No excessive grinding or machining, just for balancing purposes only. Subject to template inspection by tech official. Crankshaft must not be knife edged. Minimum weight is #50 pounds for crankshaft.
G. Wet sump oil system only. Aftermarket pulleys allowed.
H. Enlarged oil pan allowed. Kick outs will not be allowed between the bolt holes flange and the top of the added sump.
A. Stock OEM steel heads only.
B. World Products Stock Replacement Head allowed.
C. No vortec heads on built motors, no angle plug heads allowed.
D. No angle cutting heads.
E. No modifications, no porting or polishing. No grinding of any king. 3 angle valve job ok as per speedway rule. One cut below valve seat, to bottom of valve guide. Do not radius or blend bottom of cut below valve seat.
F. Chevrolet 70cc minimum; Ford (Clev) 68 cc minimum; Ford (win) 58cc.
G. Stock OEM valve size only.
H. Valve size maximum: Chevrolet 1.90 intake 1.5 exhaust, Ford Clevland 2.05 intake 1.65 exhaust, Ford Windsor 1.89 intake 1.6 exhaust.
A. Hydraulic or flat tappet cam and OEM diameter lifters with maximum lift of Chev .480, Ford .512 at valve with valve lash as ran in race. Hydraulic lifters will be measured at the retainer after replacing hydraulic lifter with a solid lifter and zero lash.
INTAKE AND SPACER
A. GM performer 2101 current design, FORD M2924-P
B. No porting, polishing, or grinding will be permitted. Do not touch it.
C. Holley #4412 carb 2bbl spacer must have 2 holes with max 1 11-16” openings. May run the same spacer on the 500 or the 450 carbs.
D. Holley 390 cfm carb is allowed a 1” solid aluminum spacer with four holes or open spacer.
E. Holes must centered and cut perpendicular with the base of the carburetor. No tapers
F. Only 2 gaskets, 1 per side, maximum thickness .056 will be permitted.
G. No adjustable spacer will be permitted.
H. All carburetors and spacers plates must meet speedway specifications.
1. The Following Crate Engines must be used as supplied from factory manufacturer. These engines are subject to tear down procedures and legalities is determined by tech committee. The staff at Myrtle Beach Speedway has invested a lot of time and money to be “up to date” on these engines, therefore make sure the engine is legal or it will be caught. These engines may require different size carbs to equal horsepower between different model #.
• GM #602
• Ford# 347JR FORD#347 SR
• GM #603 GM#604
2. These engines are designed to cut the cost of racing. Anyone found tampering with these engines will be fined up to $1000 for each offense and loss of championship points.
3. Crate Motor is a great application for Local Racing if the competitor will leave them alone. Run them as supplied from the factory to ensure legality. Contact Tech Official if you need clarification to this rule.
4. GM Crate Engines can change valve covers and distributors.
5. GM Crate Engines may run aftermarket valve springs with the same diameter, same installed height, and same open pressures as stock crate springs.
BUILT ENGINE RULES
1. ALL BUILT ENGINES BY NASCAR LATE MODEL STOCK CAR RULE BOOK
A. All carburetors are by NASCAR rule book from past years. The Holley Ultra XP 500 will not be allowed on any truck engines.
B. GM #88958602 Crate engine may use: Holley HP80507-1 390 four barrel carburetor
C. GM #88958603 ZZ4 Crate engine may use: Holley HP80507-1 390 four barrel carburetor. With crate engines the way it comes from GM
D. 602 and 603 GM crates with modified engine in rules above must run a 500 carb.
E. GM #88958604 Crate engine must use: Holley 2bbl “450″
F. 70CC Engines must use Holley 2bbl “500”
G. Ford 347 JR Crate Engines: 347JR -Holley 2bbl “500″
H. Ford 347 SR Crate Engines: 347 SR -Holley 2bbl “450”
I. A “450” carburetor is an old style Holley 500, model number 4412, 350 base plate including the two blending rings in the bottom of the venturi.
12. AIR CLEANER
A. Round air cleaner element minimum of 12 inches; maximum of 17 inches in diameter permitted. Front facial may only be half the diameter.
B. Top and bottom of air cleaner must be the same size.
C. Element must be minimum of 1 ½ “and a maximum of 4 inches in height.
D. Dry type paper element only.
E. No tubes, funnels or anything which may control the flow of air are permitted.
F. Base of air cleaner cannot extend higher than carburetor choke horn.
G. Base of air cleaner on 4 barrel carb no more than 1 ½”above mounting ring of carb.
H. No cold air boxes or cowl induction allowed.
13. TRANSMISSION and FLYWHEEL ASSEMBLY
A. Automatic, or 4 speed transmissions permitted. May be interchanged.
B. All gears must be in working order.
C. 2-speed or 3-speed transmissions, or “speed” transmission allowed. Must add 50 lbs to overall weight for 2 speed transmissions.
D. No centrifugal clutch transmissions allowed.
E. All trucks must run a steel flywheel in original location.
F. A metal Multi-disc clutch allowed. Minimum disc diameter 5 ½”.
G. Hydraulic clutch control permitted.
H. Blow proof bellhousing required. Must have speedway approved scatter shield. No reverse mount starter.
I. Bottom of bell housing may be cut for clutch service, inspection and ground clearance.
J. Drive shaft may be steel or aluminum. Drive shaft must be painted white or silver with safety loops attached to the bottom of truck.
A. Headers will be permitted. H-pipes allowed.
B. Header wrap or coating allowed AROUND DRIVERS COMPARTMENT.
C. Cast iron manifolds permitted.
D. All LS exhaust must exit behind the driver.
15. ENGINE LOCATION
A. Engines may be interchanged from one body manufacturer to another.
B. Chevrolet engine must be centered in chassis (+/- ½”) and center of #1 spark plug hole in head may be setback 2” maximum with the upper ball joint as ran in race.
C. Ford and Dodge may be set back a maximum of 4 inches from center of spark plug hole in head from upper ball joints.
D. Ford JR 347 and SR 347 crate and Chevy 602, 603, and 604 crates may be set back 2” from center of #1 spark plug hole from upper ball joints.
E. Minimum crankshaft height is 12”, measured from the center of crank pulley to the ground on all models with driver in truck in center of seat with steering wheel on steering shaft.
16. COOLING SYSTEM
A. Aluminum radiators permitted. Internal or External oil cooler allowed.
B. All trucks must have overflow hose
C. Antifreeze is not permitted. (SEE GENERAL RULES FOR FINE)
D. Electric fans are permitted.
17. ELECTRICAL SYSTEM
A. Electronic ignition allowed. Distributor may be welded or locked.
B. Only 1 stock appearing coil permitted. Aftermarket distributor allowed on all engines.
C. All Distributors maybe welded or locked on all engines.
D. Only one 12-volt battery permitted. Stock firing order required.
E. Only one MSD ignition box permitted. No magnetos. No adjustable timing controls.
F. MSD claim rule, $300 by speedway or any driver that completed the truck series race.
G. Ignition box must be visible and out of the reach of the driver.
H. Starter must mount in original location.
I. No open ended wiring in driver’s compartment.
J. Tachometer must be able to unhook.
K. No digital readout gauges.
L. Any type traction devices are not allowed. No computerized systems are allowed.
M. All ignition systems must be acceptable to speedway officials.
18. FUEL and FUEL SYSTEM
A. Speedway fuel is the only fuel allowed. No mixtures of any kind.
B. All Fuel must pass Speedway Fuel specifications. Fuel must be same color.
C. Fuel cells are mandatory and mounting of them must be speedway approved for safety.
D. Fuel cells must be securely strapped down with no less than 1/8” steel straps.
E. The maximum capacity allowed is 22 gallons.
F. Fuel cells must have 8” minimum ground clearance.
G. Fuel cell must be mounted in approved steel can.
H. After a main event you may only add 10 gallons of fuel.
19. WHEELS and TIRES
A. 10” Maximum width. 15” Steel wheels only.
B. Air bleeders will not be permitted.
C. Tires used for qualifying and race must be approved by the speedway.
D. Any truck tires from any source other than speedway supplier will be disqualified, a $500 fine imposed.
E. No chemical tire treatment allowed. Durometer and sniffer enforced.
F. 2 New F-45 Tires to be run on the left side only and previous weeks left side tires to be run on the right side only in 2018.
G. Scuffed race tires will be graded, stacked and numbered in sets. Serial numbers are recorded to make sure you race the tires that are drawn.
A. Trucks with 602 can weigh
1. 2825 pounds total weight with driver.
2. 1225 pounds minimum right side weight with driver.
B. All trucks will weigh unless otherwise stated in this rule book
1. 2850 pounds total weight with driver.
2. 1250 pounds minimum right side weight with driver.
A. All trucks will be weighed with driver in a driving position. May fuel up with 10 gallons only after race.
B. All trucks must have the weight on back of hood for tech purposes.
C. Weight of trucks may be increased or decreased to assure an equal race program.
D. All lead weight must be added to chassis securely.
E. No tungsten allowed.
F. Penalty of $2.00 per pound for any lead lost on race track and loss of lead.
A. These rules are subject to amendments for competition when ample notice has been given by the speedway.
B. Speedway officials may use professional judgment for any rule or infractions for a competitive race program. Any truck that does not conform to any of the above rules may be required to add weight and/or restrictor plate determined by the tech committee.
C. Speedway reserves the right to approve any engine parts, chassis or body parts that were approved for use in the LMSTS that began in 1996.