2017 True 10.5 Rules
ENGINE DIAPERS – All vehicles running slicks are required to utilize an engine diaper.
Stock Front frame rails (must be in stock location).
Aftermarket control arms and bushings allowed as long as they bolt in stock locations.
Rack and Pinion steering allowed.
Aftermarket strut is allowed but must follow the following guidelines:
Full on race strut prohibited ( ie. Lamb or equivalent type )
Bolt in stock location with the exception of aftermarket K-Member
Strut must be comparable to QA1 or Strange style (adjustable)
Struts that changes caster and camber are prohibited
Aftermarket coil over shocks allowed.
ALL replacement parts must be in stock location.
K-Members allowed (late model Mustangs, Camaros and Firebirds).
K-Members must feature stock attachment locations.
No part of the K-Member may be permanently attached to the chassis.
No round tube back-half/chassis cars allowed.
Mini tubs allowed.
Cars with stock location frame rails allowed notching for tire clearance
Any rear suspension allowed, 4-links, ladder bars, etc. Back-half/narrowed rear frame cars limited to ladder bar & stock style suspension only.
Motor Plate and Mid Plate allowed.
Motor must be in stock location.
No traction compound spraying devices allowed.
Firewall must be in stock location, minor modifications for trans, etc is OK.
Floor pan may be patched or repaired with welded in factory replacement panels. May be altered for thru the floor sub-frame connectors, etc.
No body alterations.
Factory headlights and taillights.
Fiberglass ok. Fiberglass replacement parts must look factory.
Forward facing hood scoops permitted.
Drilling/cutting holes in hood for air inlet prohibited.
No Pro Mod style wings. Max Wing 15″ from leading edge.
Two Front seats, turbo/supercharger cars may remove passenger seat for plumbing. Nitrous cars may remove passenger seat if bottles mounted in area.
Driver Seat must be mounted in front of Door Jamb
Door panels (aluminum door panels allowed)
Stock Dash (aftermarket gauges allowed)
10.9 Tread width max, NO W’s. Hoosier part # 18192D05 will not be allowed.
12.5 sidewall designation DOT Tires max not to exceed 10.9 inches of tread
Max 275/60/15 drag radial.
Only ONE type power adder allowed
Timers and controllers are allowed.
Progressive nitrous controllers and data recorders allowed.
Conventional headed small blocks allowed two stages nitrous systems.
Big blocks limited to one single stage nitrous system.
Single stage fogger max 4 solenoids allowed.
Single stage plate is allowed 1 nitrous solenoid -1 entry point and 1 fuel solenoid 1 entry point allowed.
Sm blk 2 stage entries may run any combination of 2 stages.
Additional nitrous systems must be capped off at the solenoids.
Dual stage, single nozzle foggers are not allowed.
Push systems prohibited.
Maximum nitrous supply line from bottles to solenoid is a single #6 line. Multiple nitrous bottles must be “Y” together at the bottles and a single #6 line from the “Y” to solenoids.
Single Turbo/supercharger allowed on small block only.
Max 91mm inlet – max exducer size 5.560″
air to air and air to water intercoolers allowed
Automatic or factory equipped manual.
NO Brunos, Lencos etc.
NO Sheet metal Intakes
Must use mass produced cast aluminum intakes (no tunnel rams)
Single Carburetors only
Only N/A cars can run alcohol
E85 is allowed
Dry Sumps are allowed
Aftermarket big blocks limited to 10.2″ unless factory dimensions exceed 10.2″ then they must not exceed factory height.
Billet or custom fabricated heads PROHIBITED.
Internal port areas of cylinder heads may be welded or epoxied for repairing, but heads must maintain standard “as produced” valve/port layout design, valve cant, and valve spacing. (no substituting canted valve for inline head, etc.)
Big Block cylinder heads must be conventional style and retain 24* style port/valve configurations. BBC 18* heads not allowed.
Small Block cylinder heads must be conventional style with a minimum 15 degree valve angle .
All valve angles will be + or – 1 deg.
No Big Chief style heads.
Sm blk canted valve, 18*, 15* & LS1 style heads will be allowed (see weight breaks).
No Insert or Collector mufflers.
Small block (2 N2O kits):
N2O TRUE 23* headed SBC or 20* SBF – 2800 lbs
15* Ford, 18* Chev heads & LS1 – 3000 lbs
Canted valve heads – 3100 lbs
One stage N20 – deduct 100 lbs
Over 450″ will be considered a big block
TURBO (sm blk only):
380 – 450 max cid – 3200 lbs
Under 380 cid – 3100 lbs
Supercharged F2 or equivalent – 3250 lbs (may be allowed on big block at group’s discretion with a weight penalty at 3750 lbs)
V-6 – 3000 lbs
Big Block (1 N20 kit only):
Up to 550″ – 3150 lbs
550″ – 605″ –3250 lbs
606″ – 640 – 3350 lbs
Any “unique or unusual” combination not addressed above can be considered for competition on a case by case basis – with a significant weight penalty.
Weight breaks may be modified/adjusted at group’s discretion.
Any car that fits within the rules of this class is welcome to race. Any “unique or unusual” combination not addressed above can be considered for competition on a case by case basis – with a significant weight penalty.
All races will be run on a .400 Pro Tree; Courtesy staging will be in effect. All cars must stage on their own power. Deep staging is not allowed. All races will be run 1/8 mile. In the instance where there is a malfunction of the track equipment, the cars in question will be brought back up for a rerun (in a reasonable amount of time – at host’s discretion). Tuning changes are prohibited, the only changes that can be made are: refueling, changing nitrous bottles, changing air pressure in tires, cooling off engine, or other safety related issues.
IHRA saftey rules are required
All cars must be scaled when required. Failure to do so will forfeit/negate that run. Please contact Kirk if you are unsure about what weight your car should be.
If the car you are racing is late to the lanes and arrives at the burnout box before you have prestaged your car – that car will be allowed to run. You will be allowed to back up and start your burnout again. If you have already prestaged and the other car is not present, then that car will be disqualified. In any other circumstances, if you have taken the tree – you have agreed to run that particular race as is. There are sometimes mitigating circumstances, these instances will be dealt with on a case by case basis.
All drivers, pit crew and family members will be expected to act in a professional manner. It is the driver’s responsibility to ensure that all pit crew members as well as family members adhere to this rule, any violation will result in disqualification and loss of entry fees. We reserve the right, as hosts of the race, to make the final decision on disqualification.
Under no circumstances are you to pull to the line without proper safety gear in place. This means EVERYTHING. Gloves, helmet, jacket, pants, harnessess, etc. This is for your own safety.
No infrared “cheating” devices are allowed on ANY car participating. If you have anything that extends from the front of the car in front of the tires, below the front of the car in front of the tires – or any thing that can trip the beams at the end of the track before the tires can. (This rule can be modified at group’s discretion)