Showtime Speedway: Mike’s Autobody of Clearwater Street Stock
Points Awards – 1st place – $500- Must run sponsor sticker on car and attend Awards Banquet to receive post season awards.
1. Cars & Weight A. Any American made car with a minimum wheelbase of 108 from factory. Wheelbase may not be altered. 1” tolerance for adjustment. Body must be stock appearing for chassis or tech approved.
B. All cars will weigh a min. of 3200 lbs. Leaf spring cars 3300 lbs. Max left side with driver – coil spring 58%. Leaf spring 55%. This may change with the competition. 100 lb weight break for 4412 (must pass no-go gauges). 25 lb. weight break for standard flywheel weighing 25 pounds or more. Minimum flywheel weight 15 pounds.
BALLAST MAY BE ADDED AND MUST BE PAINTED WHITE WITH CAR NUMBER ON EACH PIECE. All weights must be even with or above the bottom of the frame rails. Any lost or loose weight will result in automatic disqualification.
2. Body
A. Must be stock appearing for year, make, and model. No flaring of bodies and must follow factory contours. No exceptions.
B. Factory roof, hood and trunk lid must be retained. Roof may be gutted! Trunk may be gutted but must retain stock floor pan and firewall. Hood must be sealed to the cowl or windshield.
C. Rear deck must have stock appearing downward slope. Any cars not adhering to this rule may be forced to remove any spoilers and/or mount a 6” wickerbill on the roof 10” back from front leading edge of roof at a 90-degree angle. Maximum spoiler size 60”×6” with no bracing. Camaro my use factory spoiler.
D. Back of car must be closed off from top of frame rails to bottom of deck, and from quarter panel to quarter panel.
E. All holes in the firewall and driver compartment must be covered with steel for safety.
F. No operational hood scoops or cowl induction.
G. Aluminum hoods are not permitted. Fiberglass hoods are permitted.
H. May replace any corroded metal with sheet or aluminum metal for door skins, fenders, and quarter panels. Must look like an actual car – no slab sides. Door must round down and mount to the rocker like a factory door. No filler panels. All fabricated quarter panels must mount flush where the sail panel meets the side of the quarter panel with no lip or shelf.
I. May remove rear floor to just behind B post of body, and rear firewall, but must have 22-gauge steel firewall sealed tight separating driver from fuel cell.
J. All cars must have a full, clear Lexan windshield or screen that covers all of the front window. If using a screen, you must have (3) 1/2″ vertical bars in front of the driver!
K. Body must be mounted in stock location on frame – no sliding or shifting. A post mounting in the correct frame hole (both left and right). May remove rubber body mounts.
L. Hood must have a minimum of two (2) pins in front and two (2) pins in back.
M. Trunk lid must have two (2) pins and two (2) hinges, or four (4) pins.
N. Fabricated steel (stock appearing) trunk lid approved. No aluminum truck lids allowed.
O. May run 1-inch rub rail welded against body with capped ends, clean welds, no tire cutters.
P. May run pipe bumpers – maximum of 1-3/4-inch OD x .95-inch wall, square tubing, or stock bumper for car must be mounted in stock location with chain rapped and welded to frame. Minimum bumper height is 17 inches – maximum bumper height is 19 inches. Bumpers must have round corners that turn back into chassis. No open ends must be capped. Bumpers must not be installed farther out than 6 inches from the front frame horns.
Q. All welds must be clean and ground – no tire cutters.
3. Chassis & Suspension
A. All suspension parts must be stock for the year make and model of the car. A frame bolts may be changed to adjust camber. May replace bushings with polyurethane or steel ok. May use factory replacement offset control arm shafts.
B. Coil spring must be a minimum of 8 inches and must be factory diameter and fit in stock location without alteration of bucket. No spring rubbers or Gobblers allowed. No coil bound springs or collapsed springs allowed. All springs must be symmetrical from top-to-bottom.
C. May use an adjustable bucket.
D. Leaf springs, stock multi-leaf only, may be used. May use nonadjustable lowering blocks and multi-hole rear shackles for adjustment. No tapered rear end shims or lowering blocks. Factory pinion angle may not be altered whatsoever.
E. Sway bar must be stock for the specific car. Maximum 1-3/8-inch diameter. No rear sway bars. No aftermarket Howe style sway bars.
F. Sway bar adjustable at left lower A frame only.
G. All front and rear suspension components must remain stock. All suspension parts must match the frame. No alteration of suspension allowed.
H. No bump stops.
I. Stock passenger car spindles and hubs for year, make, and model ONLY.
J. No lightening or grinding of any suspension part allowed.
K. Steering quickeners allowed. Stock steering components include drag link and stock length tie rods. No interchange of uni-body, mid-size metric, and big metric/steering parts.
L. Spindles, rotors, calipers, and bottom A-frames must match chassis being used (ALL must be stock). Steel lower A-frame bushings are allowed. The hole must be in the center of the bushing. Factory replacement steel safety hub may be used. The bolt on the rotor must be factory diameter and thickness. No drilled, slotted, or curve veined rotors. May run a steel safety hub in front.
M. Shock absorbers must be mounted on stock upper and lower mounts. No modifications to shock mounts allowed, and mounts must be in stock locations. No tie rod end, Heim end or aluminum shocks allowed.
N. One (1) shock per wheel – total of four (4) shocks per car. No coil over shocks allowed. One-inch (1”) spacers will be allowed on the left-rear of the car (only). Shocks must be steel body, one (1) piece and non-adjustable. No remote or external canister type of shocks allowed. No aluminum gland nuts or shafts. No Schrader Valve! (PRO SHOCK, AFCO, CARARAS and FACTORY CRIMPED BILSTEINS OKAY) ABSOLUTELY NO ALUMINUM OF ANY KIND ON EXTERIOR OF SHOCK EXCEPT THE APPROVED AK SERIES BILSTIEN FACTORY CRIMPED SHOCK!
O. No base valve, Schrader valve or gas charged shocks with a membrane that can be pierced to charge them gas .
P. Must use stock type shock ends top and bottom. Front half of the shocks can be covered.
Q. No rebuildable shocks. No adjustable shocks. No aluminum gland nuts or shafts.
R. Any shock body that can be disassembled by removal of an external snap ring or by any means other than cutting it apart will be considered rebuildable and illegal.
S. Steel body shocks must be mounted in stock location. $200.00 claimer for four (4) shocks or $50.00 per shock after a race. Must be on the lead lap.
T. Six-inch (6”) ground clearance minimum frame and body, measured with the driver out of the car.
U. Wheelbase +/- ½” side to side difference.
4. Crate Engine
A. GM part number 88958602 and 19258602 B . GM, CRUSA, or Ricky Brooks seals only. Unsealed crate engines must run Holley 4412 two barrel carburetor & will be teched by GM Performance Technical manual specs unless otherwise stated below.
C. May use PAC valve springs pt# 1210x with NO shims under springs. PAC valve spring pt# 1210x must measure 87 lbs @1.700” and 212 lbs @ 1.270” at all times when checked or they will be deemed illegal. May shim original GM 602 valve springs to obtain PAC pt# 1210x rating & measurements. Any stock GM 602 valve spring with shims that exceeds the PAC pt# 1210x valve spring rating & measurements will be deemed illegal.
D. MSD pt# 8727CT Digital Soft-Touch HEI Rev Control Limiter only. Must be mounted on the right-hand side of drivers compartment, visible to tech, and out of reach of drivers reach. E. 602 Crate engine must follow the Gm Performance parts Technical Manual. If it is not listed don’t do it unless you have spoken to tech and have your rule book signed and carry with you to tech. A tech bulletin will then follow for all racers to see the clarification or change. 602 is totally by the GM manual, repairs etc. no exceptions
5. Engine
A. GM 350 block only with maximum .060” over bore. No splayed main caps.
B. May be zero decked. Lifter valley screens allowed. Oil return holes may be enlarged & blended for better oil return.
C. OEM or OEM replacement cast or steel crankshaft. 48 lb minimum. No knife edge, pendulum cut, or polished counterweights. Must be stock stroke for engine used.
D. Stock length connecting rod for engine used. GM may use any steel 5.7 rod. No polishing of rods & may grind rods in conventional manner for balancing purposes only. Any rod bolt.
E. Any 3-ring 2 or 4 eyebrow flat top pistons. Must use all 3 rings. Floating pins may be used.
F. Any steel harmonic balancer. 6” minimum diameter. No aluminum.
G. Any timing chain. No belt or gear drives.
H. Painting or polishing of lifter valley is allowed. May block off center oil returns.
I. Lifter valley tray allowed. Engine must be mounted in stock location. May use solid motor mounts.
5. Heads
A. GM production open or closed camber heads. 63cc minimum combustion chamber. No angle plug heads. B. Dart #10024361 allowed but must add 50 lbs. No Vortec heads on built engine.
C. Three angle valve job allowed. Final valve angle no greater than 75 degrees.
D. Must use stock valve size for head used.
E. 1.94” intake, 1.50” exhaust maximum valve size.
F. No hollow stem, titanium, back cut or tulip valves. May be stainless steel.
G. Bronze guides & guide liners allowed.
H. No porting, polishing, or grinding of any kind in the intake or exhaust ports.
I. No epoxy, paint, or coatings of any kind allowed in the combustion chamber, intake, or exhaust ports.
J. Screw in studs, guide plates & stud gridles allowed. 3/8”maximum screw in stud size.
K. 1.270” O.D. maximum valve spring diameter.
L. 120 lbs. maximum seat pressure.
M. No beehive valve springs.
N. Any length, stock diameter push rods allowed
6. Camshaft
A. Hydraulic flat tappet cam only.
B. GM – Maximum .450” theoretical lift measured at the vale or at the camshaft lobe times the factory advertised rocker arm ratio.
C. Ford – Maximum .480” theoretical lift measured at the vale or at the camshaft lobe times the factory advertised rocker arm ratio.
D. Camshaft may be degreed.
E. Stock OEM diameter hydraulic flat tappet lifters. No short travel or shimmed lifters
F. Rocker arm ratio must remain stock for engine. Stamped steel rocker arms only. No roller rockers. GM 1.5 – Ford 1.6 – Mopar 1.5
7. Intake Manifold
A. Stock OEM cast iron. No Bowtie or marine intakes. No porting, polishing or port matching.
B. May use Edelbrock RPM Performer – (General Motors 7101, 7104, 2101, 2701, 3701), (Ford 7121), (Mopar 7176).
C. General Motors 602 aluminum dual-plane intake manifold is also approved. D. No paint or epoxy allowed in the intake plenum or runners.
8. Carburetor
A. Built engines may run stock Holley 4412 2bbl or Quadrajet. Crate engines may run stock Holley 4412 2bbl, Holley 650 pt#80541 or Quadrajet. No modifications except as noted below. B. May remove choke plate & shaft. May change jets and power valve. All Holley carburetors must pass go-no go gauges. No Holley XP carburetors. C. May use any adaptor from carb to manifold Max thickness 1.625 including gaskets.
9. Cooling
A. Electric fan OK. B. Aluminum water pump ok. Water pump must be belt driven off crankshaft.
C. No antifreeze. Water only. Water Wetter or the equivalent allowed.
10. Exhaust
A. Stock OEM cast iron manifold or down under headers. Header collectors must exit parallel to the ground. B. 3” maximum o.d. exhaust pipe throughout. Must exit behind driver. Must be securely fastened under car. C. No X pipes. No H pipes. Mufflers required.
11. Transmissions
A. Stock automatic transmission with all working gears, Must have all stock parts, No light weight parts.
B. Fully working torque converter min 10” diameter. No lock up converters, No power glides.
C. May run Muncie or Saginaw 3 or 4 speed manual transmission with stock clutch & flywheel.
D. 10” Solid hub clutch disc allowed. Disc material must be full circle. No lightweight or aluminum pressure plates.
E. No 5 or 6 speed transmissions.
F. Must have some kind of working shifter. NO push pull rods.
12. Wheels and Tires
A. 15”x8” Steel racing wheels only. May run any combination of 2, 3, and 4 offset wheels are permitted. B. Only Hoosier Showtime Comanche treaded tires may be run at our track.
C. No tire softeners or chemical treating of tires allowed.
D. Showtime Speedway reserves the right to sample any tire used for competition at any time. Any tire that fails the sniffer will be deemed illegal & no sample of that tire will be taken and/or sent off for testing.
13. Rear End A. Must be stock for year make & model of car being used. May be locked. No limited slip or full spools. Moser & other aftermarket axles allowed. B. C-clip eliminators allowed.
14. Brakes A. Must have all 4 wheel working brakes. B. Stock pedal & master cylinder. may remove factory proportioning valve. No aftermarket brake bias. C. NO aluminum drums or parts anywhere in the system. D. Rear disc brakes only allowed on cars that were manufactured without a rear drum brake option & must be 100% factory stock. Must be inspected and approved by tech. May use Ultra-cool 1/8” thick steel brake cooling fan. One per wheel.
15. Ignition A. 12-volt battery only. Must be mounted in driver compartment behind driver’s seat, but must be mounted securely & in a box with a lid. Stock OEM distributor, no high-performance parts. No MSD coils or printed circuit board modules. Built engines may lock distributor. Crate engines must use stock OEM distributor as it came from GM. MSD rev limiter PT #MSD8727 CT Digital soft touch rev limiter allowed. Rev limiter must be mounted out of drivers reach at all times & can only be powered up or disabled by the battery master switch, ignition switch that supplies power to the distributor or physically terminating the connection between the rev limiter and the distributor. All crate engines using rev limiter must be set at 6300 RPM’s or less. The use of any other rev limiter must be approved by tech and all other rev limiter rules apply. B. Alternators okay. Must have master cut off switch clearly marked and easily accessible.
16. Fuel A. Fuel cell mandatory maximum 22 gallon maximum. Must be mounted in steel can. Minimum of 22 gauge. B. Must have a 1 ½ fuel cell loop protecting cell from being hit by other cars. C. Fuel cell must have 10” ground clearance.
D. Sunoco Racing fuel, Av Gas or standard pump gas only. No E85, methanol or oxygenated fuels of any kind. No fuel fragrance or additives of any kind.
17. Safety/ Roll cage A. Roll cage must be constructed of min 1 ¾ .095 wall round steel tubing, full four post roll cage, must have a min of four (4) door bars on driver side, & three (3) on passenger side & must extend out to door skin. ALUMINUM racing seat mounted to roll cage, racing seat belts ( See Safety rules). Recommended driver’s side door bars be plated with 1/16” steel plate (11 Gauge) or thicker. B. May mount radiator directly to frame, may use round tubing to protect it. C. Drive shaft loops (2) mandatory, 12 inches from each u joint, drive shaft must be painted white. D. Mirrors ok. No radios, cell phones or any other communication devices allowed apart from a Raceceiver which is mandatory.
Any deviation of rules, or cars from other tracks may be disqualified or be allowed to race with a weight penalty of 50 to 300 lbs to be located at techs discretion in the interest of fair completion. Any car may be assessed a weight penalty at any time or left side weight adjusted in the interest of fair competition.
ALL RULES ARE SUBJECT TO CHANGE AT ANY TIME. ALL TECH DECISIONS ARE FINAL.
COMPLETE TEAR DOWN INSPECTION MANDATORY FOR ALL, INCLUDING CRATE 602 MOTORS.
MAY PROTEST AND $500.00 PAID TO TECH WITHIN 10 MINUTES OF RACE COMPLETION (NO EXCEPTION) Must finish on the lead lap. Tech discretion
RULE BOOK DISCLAIMER
The rules and/or regulations set forth herein are designed to provide for the orderly conduct of racing events and to establish minimum acceptable requirements for such events. These rules shall govern the condition of all events, and by participating in these events, all participants are deemed to have complied with these rules. NO EXPRESS OR IMPLIED WARRANTY OF SAFETY SHALL RESULT FROM THE PUBLICATION OF OR COMPLIANCE WITH THESE RULES AND/OR REGULATIONS. They are intended entirely as a guide for the conduct of the sport and in no way guarantee against injury or death to any participant, spectator or official. The race director or Head Tech Inspector shall be empowered to permit reasonable and appropriate deviation from any of the specifications herein or impose any further restrictions that in their opinion do not alter the minimum acceptable requirements. NO EXPRESSED OR IMPLIED WARRANTY OF SAFETY SHALL RESULT FROM SUCH ALTERATIONS OR DEVIATIONS. Any interpretation or deviation of these rules is left to the discretion of the officials and is final and binding. On occasion when situations arise that are not covered by written rules herein, special rulings may be put into effect by the track officials. Once such rulings are acted upon, they may become an act of policy and will be added to the existing rules of procedures.
The Management of Showtime Speedway