PENTON RACEWAYS, INC.
2011 HOBBY TECHNICAL RULES
**Rules new for 2011 will be highlighted in Blue.
**Please Note That Rule Changes Or Corrections, during
the season Will Be In Red
This division is open to any 1955 or newer sedan. NO station wagons, or pick up
A. 3200 lbs with driver.
B. 3100lb with 602 crate motor.
Crate engine must have GM seal bolts, or Crate USA seals.
A. ONLY stock production steel V-8 or V-6 engines must be inline with #1 spark
plug to top ball joint NO TOLERANCE. GM crate motor # 88958602 allowed. Solid motor
B. 362 cubic inches maximum, Chevy 350, Ford 351, 374 cubic
inches for Chrysler. MUST utilize stock bore and stroke combinations.
Small block engines ONLY. No big blocks.
C. .060ths over bore permitted on all engines. Block may be surfaced, pistons
may not exceed top of block more than .010ths, measured with out head gasket.
D. Stock steel rods or stock type I-beam Eagle replacement rods. NO High End Sportsman rods, must have 3/8 rod bolt may bushed on small
end, MUST be stock length to the engine. No
H-beam rods. Example, 350 Chevrolet 5.7” maximum.
E. Steel or cast factory production crank shafts ONLY. 50lbs
minimum. Cranks must be stock stroke to engine. Example,
3.48” maximum for 350 Chevrolet. NO sportsman crankshafts, NO knife
edging. Eagle or Scat crankshaft OK must meet above rules!
F. NO engine crossovers permitted.
G. Engine balancing permitted.
H. Chassis type collector headers ONLY. NO 180, or Tri-Y
headers permitted. Cross Over Headers
Permitted, all 4 tubes from the same side of the motor must go into the same
I. Pistons: Cast or forged flat top pistons. 2 or 4 eyebrow pistons required. No Dome
Pistons. Must have 1/16”, 1/16”, 3/16” ring package
Any steel racing oil pan permitted.
NO Aluminum oil pans.
A. Flat tappet hydraulic camshafts ONLY. Lifters must remain stock diameter to
make of engine. Example .842” for Chevrolet, and .875” for
B. NO solid lifter cams or roller cams.
Timing Chains ONLY. NO Gear Drives.
A. Factory production steel heads. World Products heads (#4360 or #4361 only).
NO bowtie, Dart, SVO. Ford may run GT40 steel head.
B. NO angle plug heads, except Ford or Chrysler.
C. NO angle milling of heads.
D. Multi angle valve job permitted. NO porting, polishing, squaring, or epoxying of ports.
E. Valve size Chevrolet 1.94” intakes and 1.5 exhausts. Ford, Chrysler must
remain stock sizes.
F. Stainless steel valves permitted, undercut or tulip stem valves ok.
G. Screw in studs and guide plates permitted.
H. Roller tip rockers. Aluminum rockers and stud girdles permitted. No shaft
I. Steel valve retainers ONLY. Any spring permitted.
J. 062 Vortec cylinder heads only permitted with
following specs 62cc combustion chamber minimum, 170cc intake runner volume
max, 64cc maximum exhaust runner volume. Valves will
be removed during protest.
A. Any cast or aluminum low profile plenum intake, example 5001, 7101, or 7501 Edelbrock or 7501 Edelbrock (No Victor Jr. and Team G, or Brodix.)
NO High Rise Intakes, Vortec heads may only run Edelbrock part # 7116, or 7516 intake manifolds. Part #
must be clearly visible and unaltered.
B. NO porting, polishing, or epoxing of runners
C. 1” Carburetor spacer allowed.
A. 1 stock dual or single line, single pump, vacuum secondary 4 barrel Holley
carburetor ONLY .600 cfm maximum, EAMS dual line
spec 600cfm carburetor OK.
B. Air horn may NOT be removed.
C. NO porting, polishing, or modifying of venturies.
NO altering of boosters, throttle shafts, butterflies,
or throttle plate.
D. NO double pumpers permitted. Carbs
checked with no-go gauges made to Holley specs.
E. Crate Motor must run above carburetor or 650 EAMS vacuum secondary spec carb.
A. Stock fuel pumps ONLY. No electric pumps.
B. Racing Fuel Cell Mandatory.
C. NO ALCOHOL, NO NITROUS OXIDE, GAS ONLY.
A. Stock type electronic ignition system permitted. NO MSD 6A or 6AL ignition boxes.
B. After market coil, and ignition module permitted.
A. Stock type single disc clutches only. 10” minimum
B. Steel flywheels ONLY. 15lb minimum.
C. NO multi disc clutches, aluminum flywheels, or RAM
D. NO lighting of flywheels.
E. Ford may run 11" 15lb aluminum flywheel.
TRANSMISSION AND REAR ENDS:
A. Stock factory production standard or automatic transmissions ONLY.
Automatics must have full size torque converters 10” Minimum, NO shut off
B. Stock type rear ends. Locked rear ends permitted. May run floater rear end
with wide 5 hubs, (NO Bird cages) all rear end mounting brackets MUST be welded
to rear end housing.
C. Rear disc brakes allowed. Must be OEM automotive type.
No Aluminum calipers or rotors.
D. NO Bert, Brinn, Jerrico
or Tex transmissions.
E. Drive shaft must be steel, painted white, and have steel drive shaft loop
front and rear.
FRAME AND SUSPENSION:
A. 108” wheel base minimum.
B. Safety Hubs and Spindles OK.
C. Frame must be stock from front clip to center of rear end, minimum of 2” X
2” tubing from center of rear end to rear bumber. Camaro cars must
have rear uni-body sub frame present. Sub frames may
be connected, and X braced.
D. Lower control arms must be stock and mounted in original locations.
E. Tubular upper A-arms permitted. Stock lower A-arms only.
F. Stock steering ONLY. Quick steers allowed. NO RACK-N-PINION
G. NO 5th coils or reese
bars or additional lift bars allowed. 3 link rear suspension
with J-bar allowed with solid top link or rubber biscuit bar Only. No spring
loaded torque links. 1 90/10 brake shock allowed. Mounted
center of rear end center of chassis.
H. NO coil overs front or rear. All coil springs must
be a minimum of 5” diameter, rear springs must be bucket mounted, NO sliders,
or coil over eliminators. Leaf spring sliders OK rear only.
I. High performance race shocks and screw jacks optional. No single adjustable
or double adjustable shocks.1 shock per wheel only front and rear suspension.
J. Rear end must remain in the center of the chassis.
K. Any chassis or suspension found not to comply with rules, or considered to
have to much of a performance advantage will be
required to add weight, or move up a division, at tech officials discretion.
L. 4 wheel brakes mandatory, stock type O.E.M.
automotive disc brakes ONLY! No Aluminum calipers or rotors.
A. Stock appearing steel bodies. Fenders and quarter panels may be cut for tire
clearance. Hulling allowed.
B. Doors must be welded or bolted shut.
C. Fiberglass hood permitted. Only aluminum doors permitted.
D. No homemade nosepieces, No heavy pipe or railroad irons.
E. No push bars in front of bumper.
F. 6” spoiler maximum, spoiler may not be wider than rear of car, and supported
with a maximum of 3 triangular supports not to exceed 6” high at rear of
support, and not more than 2” high at front of support. May
use 1” wide flat aluminum for support. Crate motor may run 8” spoiler.
G. Must have front and rear tow hooks.
AFTER MARKET BODY:
A. STOCK APPEARING Aftermarket
Steel bodies will be allowed. All aftermarket bodies must have Stock Appearing
plastic nose, No Dirt Late Model nosepieces allowed. Roofs must be STOCK APPEARING Fiberglass or
Steel, No Dirt Late Model style aluminum roofs. Hood may be fiberglass,
aluminum or steel. If you use an aftermarket body install it right, No
flat-sided bodies body sides must have a body brake or rounded shape, No Dirt
Late Model Style Bodies allowed. All bodies must be mounted Straight up this
means your roof is mounted exactly in the center of the chassis (left to right)
All bodies stock or aftermarket are subject to approval by the technical
inspector. (Install it right the first time)
Body sides and roof
must look like the nose of the car they are representing, Camaro nose must have a camaro
style roof, Monte Carlo nose must have Monte
Carlo roof. Body Maximum 72” wide at any point, rear of
body may NOT taper in more than 4” from widest point of sides. 37” high from ground to top
of body side at any point, 45” from center of front hub to furthest most
forward point of nose piece. All
interior Aluminum, and decking must be level with, and
the same height as fenders, doors, and quarter panels.
B. Any bodies that don't meet body rules may be subject to a weight penalty or
moved out of the class until problem is corrected at tech directors
C. 6” x 72” spoiler maximum, spoiler may not be wider than rear of car, and
supported with a maximum of 3 triangular supports not to exceed 6” high at rear
of support, and not more than 2” high at front of support. May
use 1” wide flat aluminum for support. Crate motor may run 8” spoiler.
D. Must have front and rear tow hooks.
WHEELS AND TIRES:
A. Steel wheels ONLY, reinforced racing wheels recommended, stock type or wide
5 lug pattern allowed.
B. 12" maximum width on wheels, steel bead lock allowed on right front & right
C. NO aluminum wheels.
D. Wide 5 adapters allowed.
E. Track tire EAMS Spec/ Crate USA D21 or D55 Hoosier Racing Tires only. Tires
must be purchased from EAMS.
F. No inner liners.
G. No tire softeners permitted. Tires will be subject to durometer
hardness test at any time to determine legality.
A. Full roll cage required; brace bars may pass through firewalls.
B. All weights must be bolted on with 3/8" bolts minimum and painted
C. All holes in firewalls and floorboards must be covered.
D. Seat with 3" racing belt and shoulder harness required. Seat must be
fastened to roll cage and not to floor.
E. Battery may be moved but must be strapped securely with metal
completely covered if in driver's compartment.
F. Approved helmet and full fire resistant driver's suit required.
G. All cars must have a minimum 2 lb. Fire extinguisher mounted inside of
car within easy reach of driver.
H. Additional safety requirements are outlined in Section D of General Rules
for all Divisions.
A. Top End $250 built engine- $300 Crate Engine - $50 will be retained by track.
B. Bottom End $250 - $300 Crate Engine- $50 will be retained by track.
C. Must protest Top End to protest Bottom End.
D. Visual protest $25 - $25 will be retained by track.
E. Fuel protest $50 - $50 will be retained by track.
F. Clutch $150 - $75 will be retained by track.
G. Crate motors may be protested.