2016 OLS
Must have mufflers (except turbo entries)
Must have working headlights and taillights
Lexan allowed (windows do not have to function)
After market bolt on front clip allowed
Tube Chassis limited to stock wheelbase +/- 1”
Tube Chassis required to carry 50% on front tires
Pro chargers are limited to a F3-139 series
Alcohol permitted
**Above 101 Turbo and F-3 Supercharged cars limited to 31X10.5W tire or DOT Radial**
**Any roots blower 8-71 and smaller can run any tire**
**Any roots over 8-71 limited to 31x10.5W tire**
**Any F-2 Procharger or 101 and smaller turbo can run a 33W tire**
Any HEMI heads on 5" or larger bore space limited to 31W tire
ANY ENGINE(n/a or nos)OVER A 5" BORE SPACE LIMITED TO 31W
2250lbs. small block N/A
2550lbs. small block NOS (2 stages) add 50lbs for 3rd stage
3000lbs. small block blowers and single turbo
3200lbs small block twin turbo (true 10.5 or DOT Radial/no wheelie bars)
2400lbs. BB N/A conventional heads
2500lbs. BB N/A Chrysler with non conv heads
2550lbs. BB N/A under 5"bs non conventional heads
2700lbs. BB N/A 5" bs
2800lbs. BB N/A over 5"bs
2900lbs. BB NOS with conventional heads(single stage)
2950lbs. BB NOS with conventional heads(two stage)
3100lbs. BB NOS non-conventional heads-single stage
3200lbs. BB NOS UNDER 5"BS non-conv two-stage(big tires)
3200lbs. BB NOS 5" and over non-conv two-stage run on 31W tire
3100lbs. BB blowers and single turbo
3300lbs BB twin turbo (true 10.5 or DOT Radial/no wheelie bars)
Add 50lbs for ANY billet heads
Add 50lbs for split carbs on all combos(on big tire combos only)
Add 50lbs for sheet metal intakes on NOS combos(big tires only)
Add 100lbs for Symmetrical Heads on NOS combo(big tires only)
Deduct 75lbs for use of single carb on any combo
Deduct 125lbs. for single stage plate
Deduct 100lbs for a true 10.5" slick or 275/60
BOP combos run at small block weights

XOS reserves the right to make changes to any combination if deemed necessary by the XOS staff #xosrules






 2016 X235 Rules

BODY & GLASS
* Must have working lights, stock appearing interior, carpet, door panels, factory style dash, stock floor pans, stock firewall.
-No body components, bumper add-ons, etc. permitted with the intent of increasing the distance of the front bumper for the purposes of breaking the infrared beams (i.e. no “extenders”)

TIRE. Must be mass produced. No test or one off tires
* 26x8.5x15
* 235x60x15
PN for the P235/60R15 is 17314DR2
PN for the 26.0/8.5-15 C11 is 18115
Hoosier Tires only

SUSPENSION
* No wheelie bars.
* All vehicles must retain the factory frame rails. Notching for rear tire clearance is permitted.
* Stock suspension or ladders bars only
*coilovers ok

POWER ADDERS
* Single type power adder only. All combos

NITROUS:
No multiple stages permitted.*
No progressive controllers or Digisets
No Pusher systems of any kind (No NANO or similar), No nitrous chillers (NO COLD
NITROUS)
All nitrous solenoid grounds must be grounded in engine compartment and
visible. ( in plain sight)
No "leaking" nitrous in any way in any location.
Must have perfectly round jet orifice. No modified jets
Purge plume must be entirely outside of the engine bay and
directed upward.

Big Block OEM Block Nitrous entries maximum jetting
1 jet .076
2 jets .053
8 jets .026

Small Block Nitrous entries maximum jetting
1 jet .082
2 jets .057
8 jets .028

Small Block Nitrous entries maximum jetting(8.2 Deck ONLY!!!)
1 jet .092
2 jet .065
8 jet .032

FORCED INDUCTION
* Max turbo size 76mm measured tip to tip. (no reducers allowed to achieve this size and no clipped wheels)
* You may be required at any time to remove your turbo and/or your turbo cover to be checked.
* Maximum supercharger sizes D1, V-7 JT Trim, NOVI 2000, Kenny Bell 3.6
YSI, F1A F1C allowed. see weight
* 6-71 blowers Sb only
* No gear drives
* Air to water, Air to air intercooler OR water meth injection allowed. Can only run 1 style intercooler
* A single line from the manifold to the wastegate only
* Nothing else to top of wastegate or blow off valve

EXHAUST
* Mufflers required on all entries except turbo cars.

CYLINDER HEAD / ENGINE INDUCTION
* Big block OE passenger car block.
* Big blocks limited to stock valve angle. Call or PM for approved heads.
* Cylinder heads for SB limited to, 23 degree Chevrolet, 15 degree LS, 18 degree Mopar, 20 degree Ford, OEM Ford casting 4v Modular, any 2v Modular, Trick Flow Twisted Wedge and LS 13.5 OK
* All cylinder heads must maintain the automobile OEM intake manifold bolt pattern.
* Sheet metal or tunnel ram intakes manifolds not permitted.
* Single carb or throttle body

FUEL
* Gasoline or E85 are the only fuels permitted. Methanol only allowed in a 50/50 mix with water and is considered an intercooler.

ELECTRONICS
* Any ignition or EFI permitted.
* No traction control devices of ANY kind.
* No progressive nitrous controllers allowed.
* No boost controllers allowed. Solenoids must be removed from car
* No digiset

BASE WEIGHTS
* SB naturally aspirated - 2700
* SB nitrous - 8.2 deck or modular 3000
* SB nitrous - 3050 see bottom for weights
* SB turbo - 3300
* 6 Cyl turbo - 3200
* SB turbo billet 76 - 3500
* SB YSI billet - 3350
* SB & V6cyl supercharged/Blower - 3050
* SB F1A 3100
* SB YSI and F1C(91series) 3250
* BB NA 3000
* BB nitrous 3250
*4cyl VW 1600
*4cyl turbo manual trans 2025
*4cyl turbo auto trans 2225
*Inline 6 turbo manual trans 2900
*Inline 6 turbo auto trans 3100
* No AWD vehicles

WEIGHT PENALTIES AND DEDUCTIONS
* Deduct 50lbs for 235 radial (any combo can take weight break)
* Deduct 50lbs for SBC and SBF Stockblock. No deductions for Mod and
LS Stockblock
* Deduct 50lbs for 6AL or equivalent box with no add ons
* Add 50lbs for BBF A head
* Add 50lbs for All* SB Highport, Ford TFS-R, TFS Highport
* Add 75 lbs for All SB Nitrous 20 degree high port SR20 –FT1 or T1RI or equivalent, 15* SBF and SBC Nitrous 18* and 23* raised runner heads. No turbo/ supercharger combos with these heads
With all the new heads that are coming out, we will look at them and adjust periodically.
Engine diapers are mandatory
ANY





U/S and x275 are ran with John Sears rules.