ProStreet Rules
Class Description
PRO STREET is the quickest and fastest heads-up class in the West Coast Streetcar Association! Low 6 second
runs is what you will see in this class!  Nitrous, blown and turbo cars!
Pro Street CLASS GUIDELINES

BODY:
Steel, aluminum, fiberglass and carbon fiber bodies and body parts are allowed as long as the car retains it's original
appearance and profile. Wheel well openings can be modified for tire clearance. Rear wings are allowed, but may not
extend more than 28 inches from the transition point with the body to the tip. The drivers and passenger doors must
be fully operational and must open from the outside. The WCSA reserves the right to add weight penalties for any
body modification that does not fit within the current rules.

AERODYNAMICS:
WCSA reserves the right to add weight as deemed necessary to any body style that presents a superior aerodynamic
advantage at any time during the season
LETTERING / DECALS:
Contingency decals or SPONSOR decals may be permanent on body, per approval from a WCSA official.

CHASSIS / SUSPENSION:
Any chassis and suspension combination that passes NHRA safety standards is allowed.

DRIVE TRAIN:
Any rear-end, gear ratio and transmission are allowed. Automatic transmissions may use a
trans-brake air or electric shifters.
IGNITION:
Entries may utilize only 1 Distributor or 1 Mag.

DISPLACEMENT LIMITS:
See Weight Breaks.

ENGINE MOUNT LOCATION:
The maximum allowable engine setback is no more than 10% of the wheelbase as measured from centerline of front
spindle to center of furthest forward spark plug hole.

HEADS:
Any cylinder head is allowed as long as only 1 spark plug per cylinder is functional.

EXHAUST:
Mufflers are not required.

FUEL / FUEL SYSTEMS:
Gasoline & Alcohol only (No Nitro) The WCSA reserves the right to check gasoline at any time during competition.
The addition of chemical additives intended to alter the makeup of the gasoline for increased performance is strictly
prohibited. During fuel check, a competitor must identify the brand of gasoline being used. The sample will be
considered illegal if it does not match the baseline results (ex. color, dielectric reading +or-.2, and chemical tests)
logged by WCSA. Failure to pass fuel check is grounds for disallowance of the run during competition and
disqualification from the event during eliminations.

INDUCTION
NITROUS OXIDE:
All nitrous systems are allowed. Nitrous oxide commercially available,
thermostatically controlled blanket-type warmer accepted. Any other external heating of bottle's
prohibited. The use of any agents other than nitrous oxide as part of, or mixed with, this
pressurized fuel system is prohibited. Nitrous oxide may not be used in conjunction with
supercharger or turbochargers. If entry is teched in at a non-nitrous weight break, all nitrous
oxide lines, fittings, solenoids, and bottles must be removed before car is allowed to pass tech.

SUPERCHARGER / TURBOCHARGER:
Single centrifugal supercharger, single or twin turbochargers allowed (max twin turbo size is 91.000mm ea.) Two-
stage superchargers or turbos are not allowed (twin turbos must share a common plenum). Intercoolers are allowed.
Screw & Roots-type limited to single supercharger per engine.
Roots-type size limited to 14-71; 19 inches maximum rotor length, 11 1/4-inch case width, rotor
cavity diameter 5.840 inches maximum, variable multi-speed supercharger devices prohibited.
Supercharger restraint systems required on Screw & Roots-type units. (125% Over-Drive Limit on Screw Super
Charged Entries) Nitrous oxide not allowed in combination with supercharger or turbocharger.
TURBOCHARGER MEASURING PROCEDURE (Example 88mm):
WCSA accepted dual turbochargers are permitted with the following requirements: 1) Turbochargers must be of
conventional impeller and housing design and type. 2) Turbochargers are limited to a maximum size of 88MM - 3.464-
inch- inducer wheel diameter at the point where the leading edge of the compressor wheel meets the inlet housing. 3)
Inlet housing is permitted a maximum inlet diameter of 3.545-inch where the leading edge of the compressor wheel
meets the housing. 4) Compressor wheel to housing clearance must maintain a maximum of 0.080-inch clearance
beginning from a) where the leading edge of the compressor wheel meets the inlet of the compressor housing to b)
the transition point where the trailing edge of the compressor wheel meets the volute. 5) All air entering the
turbocharger must pass through the turbocharger inlet. Injection of any liquid, gas, or any other substance into the
inlet or exhaust housing prohibited. 6) Turbochargers must share common plenum. 7) Stacking turbochargers
prohibited. Turbocharger compressor wheel must be constructed of cast or billet aluminum. Exotic material wheels
prohibited.

TIRES:
Front tires must have a minimum tread width of 4.5 inches. Front tires do not have to be DOT
approved. Rear tires have no limitations. The tread of the tires must not protrude outside the body
line at the top of the tire.

PRO STREET WEIGHT GUIDE:
(All weights are race-ready, car with driver)

Engine Group/ Power Adder/ Weight

Import Combos:
Rotary Turbo or Nitrous / 1700
4 Cyl. Turbo or Nitrous / 1750
All 6 Cyl. Turbo or Nitrous / 2100
Single Turbocharged Combos:
All 332ci or less/ Single Turbocharged / 2150
All 333ci-450ci / Single Turbocharged / 2250
All 451ci-500ci / Single Turbocharged / 2350
All 501ci-550ci / Single Turbocharged / 2450
Small Cubic Inch Twin Turbocharged Combos:
All 332ci or less / Twin Turbocharged (up to 76mm MAX ea) / 2200
All 332ci or less / Twin Turbocharged (76.001-80mm MAX ea) / 2300
All 332ci or less / Twin Turbocharged (80.001-88mm MAX ea) / 2400
All 332ci or less / Twin Turbocharged (88.001-91mm MAX ea) / 2500
Medium Cubic Inch Small Block Twin Turbocharged Combos:
All 333ci-450ci / Twin Turbocharged (up to 80mm MAX ea) / 2450
All 333ci-450ci / Twin Turbocharged (80.001-88mm MAX ea) / 2500
All 333ci-450ci / Twin Turbocharged (88.001-91mm MAX ea) / 2550
All 333ci-450ci / Twin Turbocharged (88mm/NHRA Pro Mod or 94mm MAX ea) / 2600
Big Block (450ci & Under) Twin Turbocharged Combos:
All up to 450ci / Twin Turbocharged (up to 88mm MAX ea) / 2600
All up to 450ci / Twin Turbocharged (88.01 - 91mm MAX ea) / 2650
All up to 450ci / Twin Turbocharged (88mm/NHRA Pro Mod or 94mm MAX ea) / 2700

Small or Big Block (Big Cubic Inch) Twin Turbocharged Combos:
All 451ci-500ci / Twin Turbocharged (up to 88mm MAX ea) / 2650
All 451ci-500ci / Twin Turbocharged (88.01 - 91mm MAX ea) / 2700
All 451ci-500ci / Twin Turbocharged (88mm/NHRA Pro Mod or 94mm MAX ea) / 2750
All 501ci-550ci / Twin Turbocharged (up to 88mm MAX ea) / 2700
All 501ci-550ci / Twin Turbocharged (88.01 - 91mm MAX ea) / 2750
All 501ci-550ci / Twin Turbocharged (88mm/NHRA Pro Mod or 94mm MAX ea) / 2800

Small Block NA, Nitrous & Supercharged Combos:
Small Block / Naturally Aspirated / 1800
Small Block / Nitrous Oxide / 2000
Small Block / Roots Supercharged / 2300
Small Block / Centrifugal Supercharged / 2400
Small Block / Screw Supercharged / 2550

Big Block NA & Nitrous Combos:
Big Block Unlimited CI / Naturally Aspirated / 2000
Big Block up to a 5.0 Bore Center / Nitrous Oxide / 2225
Big Block over 5.0 Bore Center / Nitrous Oxide / 2325

Big Block Supercharged Combos:
Big Blocks with a 6.71 will be 5.0lbs per cubic inch
Big Blocks up to 455ci/ Roots or Single Centrifugal Supercharged / 2450
Big Blocks up to 455ci/ Screw Supercharger (D-Rotor) / 2750
Big Blocks up to 455ci/ Screw Supercharger (C-Rotor) / 2850
Big Block 456ci & up / Single Centrifugal Supercharged / 2500
Big Block 456ci & up/ Roots Supercharged / 2650
Big Block 456ci & up/ Screw Supercharger (D-Rotor) / 2850
Big Block 456ci & up/ Screw Supercharger (C-Rotor) / 2900
Big Block 456ci & up/ Twin F-2 SuperChargers / 2750

Weight Deductions:
*Entries using torque converters with manual trans may deduct.....50 lbs.
*Big Block Entries using OEM Automatic Transmission may deduct.....75 lbs.
*Small Block Entries using OEM Automatic Transmission may deduct...100 lbs.
*Entries using Screw Supercharger at 92% (or less) can deduct................100 lbs.
*Entries using 10.5w Rear Drive Tire can deduct.........................................150 lbs. (M/T or Goodyears only)