2021 Texas Martin Springs Ryles

Run what you bring.
NO restarts - Once you start the timer, you must go.
Winner is most consistent of two passes rather than the fastest.

Malfunction within 10' of timer is allowable restart.
Must have cooling system and charging system.
Must be able to idle for 15 minutes without getting hot.
No power additives allowed.
Must be able to be driven for a period of time, as in trails - Subject to tech test.
No aftermarket axels like military axels and so forth
Truck must be approved by tech.
Mega-trucks/ tractor trucks will not be allowed.
Tire size 44" and down cut or uncut

Malfunction within 10' of timer is allowable restart.
Run what you bring but MUST have tractor tires.
No size limit on tires.
No axle limit.
Class may be split into 2 classes: Outlaw Tractor Tire/Mega trucks and Old School Tractor Tire.
If split:
Outlaw Tractor Tire: Axle must be smaller than 2.5 ton; Tire must be under 48".
Old School Tractor Tire: Axle must be 2.5 ton or bigger; Tire must be 48" or more.
Tech decision is final.

Malfunction within 10' of timer is allowable restart.
This class is for trucks with NO engine modification.
If you can drive it down the road, this is a class for you.
Tires: 37" and under. DOT
Truck must have current registration sticker and pull 18" vacuum at 1000 RPM's.
Everything on truck must be OEM.
NO fender trimming or gutting.
Must have a muffler and all glass windows.
Lift kit is allowed.
Diesels: NO programmers/chips.
Pump gas only; NO flavor - Techs nose is official!

Malfunction within 10' of timer is allowable restart.
Tires: 38.5" and under. DOT
NO tractor tires, NO cut tires and NO recaps.
NO alcohol or NOS.
Any OEM factory produced engine.
NO injection, blower, turbo, or superchargers (unless OEM stock).
NO sheet metal or tunnel ram intakes.
One carb kit only.
OEM blocks/heads and injection only (no aluminum heads).
Fuel injection motors only on year models that are factory equipped.
Must pull 15" vacuum at 1000 RPM's and carburetor without an added vacuum pump (except diesels). Must have port to check vacuum.
Must have all glass.
NO 3 link, 4 link, sliders/floaters, or coil-overs (unless OEM stock).
NO trans-brakes.
Must have OEM full body, frame, and suspension (aftermarket suspension lifts are okay).
Must be factory, unaltered body with full bed.
Minimum fender trimming, for tire clearance only, is allowed.
Open top vehicles must have roll-cage.
Any OEM axles. Does not have to match truck (1 ton limit).
Flatbeds must meet tech approval.
Class may be split into 2 classes: 35" and under; 38.5" and under.

Malfunction within 10' of timer is allowable restart.
Tires: 38.5" and under.
Cuts are permitted. DOT
If tire does not have size stamped on it, it will be measured at 10lbs of air
OEM full steel vehicle body. Body trimming allowed for tire clearance.
Inner bed floor and sides may be removed.
Must retain factory firewall or OEM equivalent.
NO NOS. Bottle must be removed from truck or will be disqualified.
Must have fire suit (Class 1).
500 CI limit.
Engine must be within 2" from centerline of the front axle to the #1 side face of the head.
Must have drive shaft loops, U-joint shields and trans blanket.
3-link only - NO 4 link or coil-over shocks unless OEM stock.
Ladder bars allowed on rear only.
OEM transmission and transfer cases only.
Trans-brake is allowed.
NO unconventional heads. Aluminum heads are allowed.
No sheet-metal or spread-port intakes.
LS motors must be iron block and carbureted.
Dominator is allowed (4500 flange).
Only one carb kit.
NO big block in small truck body.
Must have minimum 4 point roll cage. Must tie to frame or 4"x4" plate.

Malfunction within 10' of timer is allowable restart.
Tires: 39.5" and under. DOT
Cuts are permitted.
If tire does not have size stamped on it, it will be measured.
540 CI limit.
OEM frame only. NO tubes or home-made frames.
Must have fire suit.
Only 1 carb kit.
Must have drive shaft loops.
Must have U-joint shield.
3-link only - NO 4 link.
Must have trans blanket.
Trans-brake is allowed.
Coil covers allowed.

Must have fire suit
Must retain all exterior panels. Tailgates and tops may be removed
Any OEM trucks, steel body allowed, Exception: front clips may be composite
Frame must be factory frame
Fenders may be cut for tire clearance
Must have windshield, if no windshield must have face shield on helmet
Must have firewall
Any DOT tire allowed cut or uncut
No tractor or paddles
4-Wheel independent brakes required and must be in working condition
No nitrous oxide or nitromethane (NO POWER ADDITIVES)
No center drive
540 cubic inch limit big and small
One four-barrel carburetor, dominators and SV1's allowed
Any cast intake allowed, no tunnel rams, no sheet metal intakes
Roller cam and lifters allowed
Big block/small block aluminum heads are allowed
After market ignitions allowed
Any OEM style transmission allowed
If it's a stock case it must have shield
Driveshaft loops required

WILL FOLLOW 2021 MRA RENEGADE RULES

TECH DECISION IS OFFICIAL.
TECH decision will NOT be overturned by another track official or owner. Trucks may be moved into different classes, lower or higher, on a truck-by-truck basis. There is a $200 protest fee and must be protested before truck makes pass. All controversy or truck owners that have a problem with tech will be discussed with truck owner, track owner, and tech official. If multiple people are teching trucks at an event, techs may discuss issues with each other to come to a decision. This sport is to have fun so let's do just that. Cheating will not be tolerated in any way!