Street Race / SR275
1/8th mile eliminator based on John Sears' Ultra Street rules. Rules are subject to change if John's rules change.

BODY:
* Must have working headlights, tail lights, stock appearing interior, carpet, door panels, factory style dash, stock floor pans and stock firewall. Firewall may be notched or smoothed as long as it remains intact and in the stock location.
* Fiberglass/Carbon body panels are limited to hood, rear deck lid, fenders, doors, and bumpers. Must be neat in appearance and not change the basic vehicle dimensions.

* Lexan windows permitted. Must be neat in appearance.
* Hood height limited to maximum 8" tall measured from the tallest part of the hood to base of the windshield (measured with a level sitting on the tallest part of the hood).
* Forward facing air inlet feeding induction on any combo add 50lbs.

* Must measure within 1" of factory wheelbase, body may not be moved from stock location
* All vehicles must maintain a minimum ride height of at least 2.5" while at rest and at race weight. No part my hang down lower that 2.5" off the ground including exhaust.
* No part of the car may protrude more than 45" forward of the front spindle centerline.

INTERIOR:
* Aftermarket steering columns are allowed.

* Must have carpet and factory type dash

ELECTRONICS:
* Optical devices are prohibited.

* Any ignition or EFI permitted.
* Progressive nitrous controllers & programmable boost controllers allowed.

ENGINE:
* Aftermarket blocks and cylinder heads are allowed.

* All entries must utilize a single carburetor cast intake manifold.

* Motor plates and solid mounts are allowed. Engine must be in stock location and not touching the stock location firewall.

* Mufflers are required on all vehicles except turbocharged combos.

* All SB power adder engines are limited to 440 cubic inches.

* BOP nitrous engines limited to 470ci

* SB N/A up to 480 cubic inch permitted with added 7 lbs. per cubic inch over 470.

* BB N/A limited to 640.

* Any engine in question will be measured with a P&G gauge. A correction factor of 1.5% will be used on P&G measurements. Competitors may be required to remove a cylinder head for bore and stroke measurements should any discrepancies arise.

INDUCTION:
* Power adder small blocks and N/A BB combinations may use a single cast intake manifold with single carb or EFI.

* Small Block N/A may use cast tunnel ram/sheetmetal/dual carbs w/weight penalty (See*below)

POWER ADDERS:
* Power adders limited to SB and BOP entries.

* Progressive nitrous controllers are allowed.

* Nitrous entries must utilize a single stage nitrous plate with all nitrous lines feeding the plate originating from the same solenoid or distribution fitting.

* Foggers must be disconnected and all solenoids must be capped off.

* Nitrous plates using fogger nozzles or multiple adjustable internal nitrous spray outlets are not allowed.
* Turbocharged (mid frame turbo only) and supercharged entries are limited to stock valve angle SB combos only. (SB CHEVY 23 DEGREE - SB FORD 20 DEGREE - 18 DEGREE MOPAR - FACTORY HEADED SMALL BLOCK FORD MOD MOTOR - LS CHEVY 15 DEGREE)
** NOTE: No raised runner heads permitted forced induction. SB Chevy 23 degree Raised Runner, SB Ford 20 degree (SR20, FT1 or T1RI or equivalent) not permitted with boosted combo

TRANSMISSION:
* Any OEM style automatic or manual transmission is allowed.

* Manual transmissions must utilize SFI approved bell housing.

REAR SUSPENSION:
* Stock type rear suspension or ladder bar only.

* Coil over shocks, anti-roll bars and aftermarket replacement control arms are allowed.

* Stock frame rails must be in factory location, notching permitted.

* Corvette permitted any type of transverse leaf spring rear suspension.

* Wheelie bars are prohibited on all cars.

FRONT SUSPENSION:
* Factory type front suspension only. Coil over shocks, aftermarket replacement control arms and aftermarket K-Members/Sub-Frames allowed.

WHEELS/TIRES:
* N/A entries allowed a 28 x 10.5 non W slick (N/A small block only), 28 x 12.50 ET Street or any 275 radial may be used.

* Power adder combos limited to a P275/60-15 DOT drag radial tire.

* Wheel width is limited to 12"

NITROUS WEIGHTS:
* All 15 degrees and above SB and BOP combos - 3200
* GM LS 15 degree & Ford TFS-R or TFS-TW with stock intake port location and height - 3100

* GM LS 15 degree & Ford TFS-R or TFS-TW with raised intake port location - 3200
* All heads 14.9 and under - 3250
* Any canted valve head - 3250
* Any non-raised intake runner 23 degree combo - 3000
* Any raised intake runner 23 degree combo - 3150

* Any non-raised intake runner 20 degree ford - 3000
* Any 20 degree raised intake runner SR20, FT1, T1RI or equivalent - 3150
* Blue Thunder, Edelbrock SC1, SBX and equivalent cylinder heads - 3300
* C3/C302B/C302/Yates style - 3150


SUPERCHARGER WEIGHTS:
* D1, V-7 JT Trim, NOVI 2000, Kenny Bell 3.6 - 3100

* F1A & V-4 J Trim -3150
* F1C & YSI - 3200


TURBO WEIGHTS:
* T-76 - 3150
* T-80 - 3200

* GT55-80 and equivalent - 3275 (Any other equivalent turbo must have prior approval.)

N/A WEIGHTS:
* Inline head - 2650
* Non-Inline head - 2750
* Big block with standard deck height and conventional head - 2950
* Big block with tall deck height and conventional head - 3000
* Big block with standard height and big chief head - 3050
* Big block with tall deck height and big chief head - 3100, over 589 add 100lbs

GENERAL:
* No Billet cylinder heads/blocks
* No Billet wheels on 80mm turbo combo (add 50lbs for 76 w/billet wheel)
* No Reducers on turbo or supercharged combo
* Alcohol/E85 legal (meth injection legal on non-intercooled combo only)
* All turbochargers (mid frame only) and superchargers must be as manufactured from factory
* No muffler required on turbo entry, required on all other combos
* No bull horns - front exit exhaust permitted but must not effect timing equipment
* Gear driven supercharger allowed
* Belt driven supercharger deduct 50 lbs
* Boosted LS 15*, TFS-R, TFS TW add 50 lbs (not permitted raised intake runner from factory height)
* Non intercooled boosted combos deduct 100lbs (no deduct if on Alcohol for fuel)

* Non intercooled boosted combos running E85 deduct 50lbs
* Front mount air to air intercooled boosted combos deduct 50lbs (no deduct if on Alcohol for fuel)
* Model years prior to 1979 or any year true leaf sprung rear suspension deduct 50lbs
* Cast tunnel ram/sheetmetal/dual carbs on SB N/A add 50 lbs
* Single 4150 carb deduct 50lbs (N/A or NOS only). 4150 based throttle body not eligible for deduction.
* V6 entries deduct 100lb
* Forward facing air inlet feeding induction add 50lbs.

What's different between SR275 and Ultra Street?

What you may want to know if you are an Ultra Street racer coming to run in Street Race.

* Power adder combos limited to a P275/60-15 DOT drag radial tire.
Ultra limits power adder combos to the Mickey Thompson 3754R radial tire.

* V6 entries deduct 100lb
Ultra has V6s deducting 200lbs

* Single 4150 carb deduct 50lbs (N/A or NOS only). 4150 based throttle body not eligible for deduction.
Ultra gives the weight break to 4150 based throttle bodies.
* Boosted LS 15*, TFS-R, TFS TW add 50 lbs (not permitted raised intake runner from factory height)
Ultra doesn't permit TFS-R & TFS TW to run forced induction or specify LS must run OEM intake runner location.
* Non intercooled boosted combos deduct 100lbs (no deduct if on Alcohol for fuel)
Ultra only give a 50lb break for non-intercooled.

* Non intercooled boosted combos running E85 deduct 50lbs
Ultra does not give any weight break for E85 non intercooled.
* Front mount air to air intercooled boosted combos deduct 50lbs (no deduct if on Alcohol for fuel)
Ultra doesn't give any break for air to air intercoolers.
* Model years prior to 1979 or any year true leaf sprung rear suspension deduct 50lbs.
Ultra gives a 100lb break for leaf sprung vehicles and no break for pre-1979 bodies.
* D1, V-7 JT Trim, NOVI 2000, Kenny Bell 3.6 – 3100
Ultra doesn't give a weight for these smaller blowers.

* F1A & V-4 J Trim -3150
Ultra doesn't include the J-trim in this weight bracket.

* GT55-80 and equivalent – 3275 (Any other equivalent turbo must have prior approval.)
Ultra doesn’t list a weight for the GT55-80.
* Blue Thunder, Edelbrock SC1, SBX and equivalent cylinder heads – 3300

Ultra only lists the Blue Thunder head in this category.
* GM LS 15 degree & Ford TFS-R or TFS-TW with stock intake port location and height – 3100
Ultra doesn’t include the TFS-R and TFS-TW in this category and has standard port location 15* LS grouped in the 3200lb 15 degree and up category.

* GM LS 15 degree & Ford TFS-R or TFS-TW with raised intake port location – 3200
Ultra doesn’t include this weight group, all LS 15* engines run at 3200.
* Nitrous plates using fogger nozzles or multiple adjustable internal nitrous spray outlets are not allowed.
Ultra just states “nitrous plates using fogger nozzles are not allowed.”
* Nitrous entries must utilize a single stage nitrous plate with all nitrous lines feeding the plate originating from the same solenoid or distribution fitting.
Ultra states “entries must utilize a single stage nitrous plate with one nitrous, one fuel and one redundant purge solenoid.”
* BB N/A limited to 640.
Ultra limits at 632. This allows a 632 to get a clean up if a cylinder wall is scratched.
* BOP nitrous engines limited to 470ci
Ultra allows a nitrous BOP to go 588ci. Ultra also permits a big block Mopar to run nitrous at 588ci. Street Race does not permit BBM to use nitrous.

* C3/C302B/C302/Yates style - 3150
Ultra has these heads at 3100 which is 50lbs less than raised runner stack valve angle combos.
* Hood height limited to maximum 8" tall measured from the tallest part of the hood to base of the windshield (measured with a level sitting on the tallest part of the hood).
Ultra states “cowl hoods may not be taller than half way point of the windshield.”
* Forward facing air inlet feeding induction on any combo add 50lbs.
Ultra doesn't permit forced induction a forward air source and states “forward facing scoops are prohibited on power adder combos unless factory installed or less than 5 inches from flat area of hood.”
* Must measure within 1" of factory wheelbase, body may not be moved from stock location
* All vehicles must maintain a minimum ride height of at least 2.5" while at rest and at race weight. No part my hang down lower that 2.5" off the ground including exhaust.
* No part of the car may protrude more than 45" forward of the front spindle centerline.
Ultra doesn't include any of the above 3 body rules.