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NGS rules……updates.

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February 2011
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The rules on the tracks website had a few gliches that have been corrected below, the track will be updating the rules soon as possible, this is to just give drivers a set to go by til then.

I hope this clears things up.

Again there will be NO ECONO hobby at NGS this year it will be Mod hobby and B hobby the b hobby rules are the same as Boyd’s speedway, and the Mod Hobby rules will be like last year, Although enforcement will be much different this year, RULES WILL BE ENFORCED!


the dr.

2011 North Georgia Modified Hobby Rules

RaceCeiver Required, No other radios or communication equipment or mirrors allowed at any time.

All Hobby Cars Must Have A Rear Tow Hook

Modified Hobby 2800 lbs.

Modified Hobby with OPTIONAL engine and clutch rule 2900 lbs. (see rules for these options.)

Also note: With Rack Steering on Modified Hobby you must add 50 lbs. to the basic weight.

Limited to American made cars only. No compact, convertibles, sports cars or station wagons.


A. OEM stock steel bodies must maintain stock appearance. Rear of car can be open.

B. OPTIONAL BODIES: Stock Appearing Aftermarket Steel or Aluminum bodies will be allowed. All aftermarket bodies must have plastic nose and tail pieces, Roofs must be Stock Appearing Fiberglass or Steel, No Dirt Late Model style roofs. Hood may be fiberglass, aluminum or steel. If you use a aftermarket body install it right, No flat-sided bodies, 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.

C. No front push bars will be allowed. All tubing must be kept completely behind front bumper in the grill area. If you have a body style with a plastic nosepiece all guards must be behind nosepiece.

D. Rear of car may be open. Rear push bars permitted.

E. All cars with stock bodies must have OEM type front bumper. No homemade tube type bumpers. Cars with aftermarket bodies must have plastic nosepiece.

F. No glass or lexan in windows (must be open).

G. RaceCeiver Required, no other radios or communication equipment or mirrors allowed in car at any time.

H. Any plastic additions must conform to original body contour.

I. No home made nosepieces or body parts.

J. Spoilers may have a maximum size of 8” height, by 65” width. Note: Gurney Flaps or Curls are allowed along the upper edge of the spoiler, but their length will be included in all measurements, Spoilers will be measured according to total length of and width of material, in any shape.

K. Three spoiler braces allowed, braces must be triangular in shape, maximum height of 8” inches and maximum length of 18” inches at base.

L. A metal firewall must encompass the driver’s compartment – front, rear, sides and floorboard.

M. Boxed interiors permitted.


A. Stock frame rails. Body does not have to match frame but must be OEM stock steel or one of the approved Five Star body kits. This will allow you to use a newer body style.

B. Tying frame rails together, reinforcing or X bracing permitted.

C. Weight jack area may be altered. Buckets, plates, etc.

D. Frame or frame rails may be replaced from snout, (must be a stock automotive Camaro snout) to the rear of car with a minimum of 2” x 2 ” square material, and must be .095-wall thickness.

E. Front snout, stock Camaro or the optional Howe Racing LLM direct replacement Camaro front clipart #358-8-01 (2×4 Rails and stock lower A arms and steering box) Howe clip must have Howe Inspection tags in place to be legal.


Technical Inspector must approve all cars with replaced frame or frame rails. Remember this is not late model or sportsman so don’t build a late model or sportsman chassis to race this division!!!!


A. Tubular upper control arms and mounts permitted.

B. OEM Lower control arms for make & model required. After-market bushings permitted.

C. OEM or Safety spindles and hubs permitted.

D. 5” minimum O.D. on coil springs.

E. Weight jacks permitted.

F. OEM steering boxes only.

G. Inner and Outer tie rod ends may be rod ends and any tie rod sleeves permitted.

H. Rack & pinion steering will be allowed with a 50 lb. weight penalty.

I. Racing shocks permitted, one shock per wheel, No canister shocks.



1. Slide boxes on leaf spring cars permitted.

2. No coil overs or coil springs allowed.

3. Upper link, rubber bushing torque link or spring loaded type upper link permitted on leaf cars.

4. No 5th coil, 90-10’s, lift bar, pull bar or Reese bar, etc.

5. Racing shocks permitted, one shock per wheel, No canister shocks.


A. May use a three point set up with a solid mount upper link bar, solid bar & rod ends. No 90-10’s, spring bar or rubber bushing torque links allowed.

B. Solid Panhard Bars with rod ends permitted.

C. Rear lower control arms may be aluminum or steel tubes with rod ends with a maximum length of 26” inches from center to center of the mounting holes.

D. Rod ends allowed on solid panhard bar, solid upper link bar and rear lower control arms, this is the only place rod ends will be allowed on rear suspension.

E. No 90-10’s, spring bar or rubber bushing torque links. No 5th coil, lift bar, pull bar or Reese bar, etc.

F. 5” minimum O.D. on coil springs.

G. No coil overs or coil over eliminators.

H. Racing shocks permitted one shock per wheel, No canister shocks.


A. All cars must a suitable steel roll cage protecting the drive’s compartment.

B. Side roll bars are mandatory, and must extend into door panels; a minimum of three bars must be used on left side and two on right side.

C. Bars must be at least 1-1/2” inch in diameter and a minimum of .095” inch wall thickness.

  1. Roll cage must be welded to frame.

    Modified Hobby engine rules



A. All engines have a maximum bore size and must be standard stroke for engine being used.

B. Small blocks only, No big blocks.


A. OEM Cast iron V-8 block only.

B. Maximum cylinder bore size, Chevrolet 4.060, Ford 4.060,Chrysler 4.060

C. OEM main caps only, No after-market main caps, No splayed, or strapped main caps.

D. Deburring block and plugging deck to strengthen block permitted.

E. Plug or vent and screen oil drain holes in lifter valley permitted.

F. May surface deck of block.

G. Lifter bore must be OEM diameter for engine, Chevrolet .840, Ford .875, Chrysler .901.


A. Standard production OEM or Stock Replacement cast or steel crank.

B. Must be standard production stroke for engine.

EXAMPLE: 327cid Chev- 3.250 / 350cid Chev – 3.480

302cid Ford – 3.000 / 351cid Ford – 3.500 /360cid Chrysler – 3.580

C. No stroking or destroking.

D. No lightening or knife-edging crank.

E. No turning down counter weights or drilling crank pins.

F. Eagle or Scat type stock replacement cranks allowed. The thru holes will not be considered “drilling the crank pins” due to the cranks are manufactured with the thru holes.

G. May balance engine.


A. Stock appearing I-beam steel rods.

B. 6-inch rods permitted.

C. No H-beam sportsman type rods.

D. Press or floating pins permitted.


A. Any flat top pistons and pins.

B. No dome pistons.


A. Any lift and duration permitted.

B. No roller or mushroom or radius cams.


A. Hydraulic lifters only.

B. No cheater hydraulic or modified lifters.

C. Anti pump-up lifters permitted.

D. No roller or mushroom or radius lifters.

E. Lifter retaining tray permitted.

F. Lifter must be OEM diameter for engine, Chevrolet .840, Ford .875, Chrysler .901.

G. Optional solid lifter permitted. (Car must weigh 2900 lbs.)


A. Any chain and gears.

B. No gear or belt drives.


A. OEM standard production cast iron heads only, all heads must have casting numbers and numbers must be readable at the time of a cyl. head check.

B. Chevrolet straight plug heads only.

C. Chevrolet stock Vortec heads permitted.

  1. No Chevrolet Vortec Bowtie heads.

    E. World Products S/R (stock replacement) heads casting # I-052 permitted.

F. Ford and Chrysler angle plug standard production cast iron heads permitted.

G. No Bow Tie, W2 or Ford SVO heads.

H. May surface heads (no cc limit).

I. Steel valves only, No titanium,

J. Maximum size for Chevrolet, Int. 1.940, Exh. 1.500

Optional 2.02 Int. & 1.6 Exh. Valves Permitted (car must weigh 2900 lbs.)

K. Maximum size for Ford and Chrysler, (Consult Tech Inspector)

L. Valve stem diameter 11/32 minimum for all engines.

M. Under cut stems permitted, any type guides.

N. Any valve springs and keepers permitted.

O. Steel retainers required.

P. Guide plates and screw in studs permitted.

Q. Roller rocker arms permitted any ratio.

R. No after-market shaft or pedestal mount rocker arms allowed on Chevrolet.

S. If standard production head came with shaft or pedestal mount rockers they will be allowed.

T. Optional stud girdles permitted ( Car Must weight 2900 lbs.)

U. Racing valve job permitted, Machine cuts only.

V. No porting or polishing all heads must remain AS-CAST.

W. No blending valve job to casting.

X. No port matching or deburring intake or exhaust runners.


A. Fluid damper permitted.


A. Wet sump oil pump in pan system only.

B. No dry sump system.

C. Racing oil pan and or windage tray permitted.

D. Remote oil filter and oil cooler permitted.


A. Cast or aluminum permitted.

B. No electric water pump.


A. Block mounted mechanical pump only.

B. No electric pump.


A. Steel flywheel only. (14 lb.) Minimum on flywheel.

B. Optional Triple disc clutch permitted. (Car must weigh 2900 lbs.)


A. Standard stock type discs and pressure plate only.

B. No special production clutches or clutch parts.

C. Must use diaphragm type pressure plate, with solid face.

D. No 3-finger pressure plates.

E. 10’’ inch minimum diameter on clutch.

F. Full circle fiber type disc with spring loaded hub only, no puck type fiber disc or solid hubs allowed.

G. Pressure plate and disc must be steel.

H. Optional Triple disc clutch permitted. (Car must weigh 2900 lbs.)


A. OEM factory HEI or OEM factory single point distributor only.

B. After-market coil and module will be allowed as long they are stock appearing and mount in stock location with no modifications.

C. Advance kits permitted. D. No ignition booster or amplifier to ignition.

E. No dry cell battery pack to ignition.

F. Alternator, if used must be wired to battery, no loop system wiring to distributor.


A. Any single four-barrel intake permitted.

B. $250.00 claim or swap rule on intake.

C. Any size carburetor spacer permitted.


A. One single line 600 CFM four barrels only.

B. Must use a Holley 600 CFM single line, single pump, and vacuum operated secondaries only.

C. No secondary metering blocks.

D. No center hung float bowls.

E. No down leg boosters.

F. No cutting of choke housing.

G. No porting or polishing.

H. Choke linkage and butterfly must be removed.

I. K & N flow control air cleaner permitted.

J. Carburetor must pass tracks tech. TRACK TECH (GO NO GO) GAUGE

Venturi & Throttle bore specifications Holley 600

Primary Venturi Max. size ~ 1.260

Secondary Venturi Max. size ~ 1.322

Throttle bore Primary & Secondary Max. size ~ 1.572

K. Optional Holley 750 cfm, dual line dual pump carburetor ( Car must weigh 2900 lbs.)

Note : lines A – F does not apply to 750 carburetor.

Venturi & Throttle bore specifications for Optional Holley 750

Primary Venturi Max. size ~ 1.385

Secondary Venturi Max. size ~ 1.385

Throttle bore Primary & Secondary Max. size ~ 1.698


A. Modified Hobby 2800 lbs. minimum with driver.

B. Optional Modified Hobby 2900 lbs. minimum with driver.

As noted when using any or all options.

( 750 Carburetor, 2.02/1.6 valves, Triple disk clutch, solid lifters, or stud girdles.)

C. Must add 50 lbs. to basic weight for Rack Steering.

D. All cars must have specified weight posted on top right side of roof.

E. 20 lb. weight allowance after feature race.

F. All weight must be bolted on.

G. Track reserves the right to adjust weights in interest of competition should it deem necessary.


$350.00 One Head (2 valves will be pulled)

$250.00 Oil Pan

$300.00 Flywheel and Clutch

$50.00 Engine Setback

$250.00 Claim on Intake



  1. jamie hayes says:

    What is tire rule for mod hobby?

  2. jamie hayes says:


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