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Dukes To Make 2016 Return at Miramichi Oval

A Facebook post from Speedway Miramichi today simply announced that the Dukes class will return to the oval in 2016, along with a rules package for the class.

The building rules that were attached to the post are below.

The track will host a Demolition event on Saturday, November 7th at 12 Noon. Their stock car season wrapped up on October 18th and plans are in the works for more events at the speedway in 2016.

2016 Dukes Rules
Approved Models

General Motors: 1973 & up Nova/Venture/Monte Carlo/Chevelle/Lemans/Malibu/Impala/Parisienne or similarly designed cars.
Ford: 1973 & up Torino/Thunderbird/Granada/Crown Victoria or similarly designed cars. Up to 1991 Crown Victoria. 1992-1995 Ford Crown Victoria allowed (must use drum brake housing from 1991 and prior) Chrysler: 1973 & up Dart/Satellite/Charger; 1978 & up Volare/Diplomat or similarly designed cars.

No Mustang, Camaro, Cuda or similarly designed cars

Any other models are subject to approval by track management.
Minimum wheelbase of 108” (factory specifications) with not more than one inch difference (+/-) side to side.


All steel bodies approved or OEM 5 star replacement panel.
No fiberglass body panels similar to Duraflex are approved.
A tow chain around the front and rear bumper is mandatory.
No body part can be lower than 5”.
1/8th Lexan or stock glass windshield is permitted. A minimum of two steel vertical braces on the inside of the windshield placed to the right of center are mandatory.
Lexan windshield is recommended!

All interior flammable materials must be removed with the exception of the driver’s seat.
A factory front firewall in stock position aswell as a rear firewall to enclose drivers compartment is mandatory.
Floors may not have any holes. They may be repaired with steel but must retain their original appearance. Metal interior panels MAY be removed. If interior panels have been removed, they must be steel braced to sufficiently prevent bowing and deforming. They will be subject to a weight penalty if excessively lightened.


Battery must be behind driver’s seat in an approved sealed battery box and securely fastened.
Charging system and starting system must be operating.
Ignition system must be clearly marked “off” and “on” and be accessible from the outside of the car on either side as well as within the driver’s reach (when safety harness is fastened).


All cars must weigh a minimum of 3300 pounds with driver at all times for large engines and 3200 pounds for small engines
Maximum left side weight 53% of total weight.
Maximum rear weight 45% of total weight.


Cars must have four-wheel brakes in working order, drums on rear.
No bias valves permitted.
Power booster must remain in stock location on firewall.
Standard master cylinder in stock location will take a 10lb penalty. This weight must be bolted on the top of the master cylinder to the firewall.
No brake duct hose is permitted. No electric fans allowed.

Chassis and Suspension

All suspension parts are to be stock with no modifying.
The car must be a minimum of six (6) inches of the ground measured at lowest point under the
frame Ground clearance will be the same on both sides. Inspection height gauges must pass under frame with no contact.
All vertical measurements will be taken with driver in car.
Front coil springs may be OEM or OEM replacement type. No beehive or progressive rate springs allowed. Front springs must have stock coil spacing. Springs must be a minimum of 5.0” O.D. (+/- ½ “) in diameter. Front springs must sit in the original OEM spring seats. Solid shims may be used on the top of the spring and seated in the original spring seat. Springs may be heated or cut but must remain in factory positions. Solid wedges are permitted in the front springs. Stock arch must be maintained on rear leaf springs. No lowering blocks, jacking bolts, or adjustable spring spacers.
No cutting and/or welding pitman arm.
No air shocks or bags.
Stock sway bar only. Bar MUST be mounted in original brackets under frame rail. Sway bar MUST be mounted in OEM position on top of control arm. OEM sway bar not to exceed 1 1/4”O.D. Sway bar links must be OEM type. They are to be installed as original. This will include positioning the link straight up from the control arm to sway bar at each end. The links MUST be equal height side to side, NO CHAINS. Stabilizer link bushings may be rubber or urethane (no steel). These links may NOT be adjustable.
Springs must be of original design of OEM and in stock location. No coil-over spring/shock combinations.
Rear coil springs may be OEM or OEM replacement type. Rear springs must be a minimum of 5” O.D. (+/- ½ “). Rear springs must have original spacing side to side. Rear spring seats may not be modified to accept closed coil-ground spring. Recommended 1” bucket type spring seat on differential housing. Solid shims may be used on the top of the spring and securely fastened. Solid wedges ( rubber ) may be used between the coil spring spacing. ABSOLUTELY no adjustable spring seats allowed. One stock replacement shock absorber per wheel in stock position using stock mounting hardware is permitted. No racing shocks. All shock numbers MUST be readable. Shocks will be deemed illegal if numbers are unreadable. Upper and lower control arms, MacPherson strut towers, and all other suspension components must remain stock. No reinforcing.
Only stock OEM spindles and rotors for year, make and model may be used.
Original collapsible steering columns may be used. Quick release steering wheel may be installed which could mandate the changing of the steering column. This is permitted. All steering components must meet the original specifications of the manufacturer for specific year, make and model. Rear control arms must be stock and in stock position.

They will be subject to a strict adherence policy and will be inspected by template as to correct dimensions. Further information is found in APPENDIX “B” in this rule package. For 2013 Front end Camber angle will be inspected. The camber specifications will be as follows:
LF wheel maximum camber will be 2.5 degrees positive or negative (+/- 0.5 degree)
RF wheel maximum camber will be 4.5 degrees positive or negative (+/- 0.5 degree)
Minimum left side control arm length 8.0”, minimum right front control arm 8”. If top control arms are homemade they must meet manufacturers spec ball joint location.
Upper and lower ball joints to remain stock and in stock position.
Fuel System

Original gas tank must be removed.
A fuel cellmust be installed in the trunk, between the frame rails, as close to the rear firewall as possible, securely strapped to the frame of the car. Fuel cell must be no lower than 12” from ground.
Filler must be inside trunk.
Two pieces of tubing, pipe or angle iron may (Mandatory if trunk floor is removed or weak) be welded between the frame rails to install tank. These pieces may be parallel or in an “X”.
Tank must be secured to frame without movement.
All fuel lines must run under the floor and be metal. Steel braided fuel line may be used provided it is attached at or near OEM locations and is also OEM inside diameter.
A metal box completely enclosing a plastic tank is mandatory. If not a SFI approved fuel cell.
May use any size approved fuel cell positioned as above.
Any gas leak of any kind will park a car.
Fuel: Filling station gas only with no additives. No aviation fuel allowed.
Stock fuel pump only. (No electric fuel pumps)
Throttle must have two return springs on separate brackets.
AIR CLEANER AND AIR FILTER: Only Track approved round air cleaner element minimum 12 inches and maximum 14 inches diameter will be permitted. A Track approved completely dry pleated paper element – minimum 1 ½ inches – maximum 3 inches high must be used in the air cleaner at all times. All air shall be filtered through element. The air filter element may not be sprayed or soaked with any type of chemicals or liquids. Only a round metal air cleaner housing is permitted. The top and bottom of the air cleaner must be solid and must be the same diameter. No lips or expanded edges are permitted. The air filter housing must be the same diameter as the air filter element. The air cleaner housing must be centered and sit level on the carburetor. The bottom of the air cleaner housing must be lower than the top of the carburetor choke horn. No tubes, funnels or any device, which may control the flow of air, is permitted inside of the air cleaner or between the air cleaner and the carburetor. No K&N Air filters (or K&N style filters) will be allowed

Rear ends/Drive shafts

No lockers, limited slip or posi rear ends. Welded rear ends allowed.
Gear ratio: Maximum 373
Front and rear drive shaft loops mandatory.


Radiator (only one allowed) must be in stock location. Aluminum radiators will be allowed.
They must be OEM replacement type units. They are to fit within the stock radiator support.
Must have a cooling system overflow located in engine compartment only. Water is the only acceptable coolant. No anti-freeze.


Must run stock engine; i.e. G.M. in G.M., Ford in Ford, MOPAR in MOPAR.
All engine parts must meet OEM specs for engine and brand.
Engine must have an engine mount restraint on the left side. Solid mounts acceptable provided they conform to OEM specs Engine must be located in stock position.
GM: may run 350 or 305, FORD may run 351 Windsor or 302, MOPAR: 360 cu. 318 in. only.
FACTORY PRODUCTION FIRING ORDER ONLY. See weight rules in weight section for each motor type.
NO 327 CU. IN. ENGINES or 340.
The following specs are for the GM 350 and 305, 351 Windsor and 302, and the 360 MOPAR and 318:
350 And 305 Chev – 4.000″/3.485″
351 Ford – 4.000″/3.500″ and 302 4.00”/3.oo”
360 MOPAR – 4.000″/3.578″ And 318 3.91”/ 3.31”. .030 overbore permitted.
CAM/LIFTERS: Hydraulic lifters (no mushroom type) and a hydraulic lifter camshaft with maximum specifications as follows (all measured at the valve):
G.M. lift – intake .390 exhaust .410 Ford lift – intake .419 exhaust .448 MOPAR lift – intake .410 exhaust .410 No solid Anti-pump or Rhoads lifters.
Camshaft must have stock duration.

Vacuum 21”@ 800 RPM (The engine must be able to achieve 800 RPM at idle-in park with no throttle or mixture screw assistance)
PISTONS/RODS : stock cast (dished or flat top) pistons only (or equivalent replacement).
G.M. must have four relief valves from manufacturer. Stock rods (No 6″ G.M. rods) and pressed wrist pins only. No floating pins. Aftermarket rod bolts and nuts are allowed.
COMPRESSION RATIO: Maximum compression ratio of 8.5:1 is set. (8.7:1 on whistler will be deemed illegal). Compression will be determined by volume gauge and electronic sonic tester (whistler).
HEADS: All cylinder heads must be cast iron, OEM smog type, with specifications as follows: G.M.: 333882, 3986336, 3998920, 3998993, 462624 castings only. Maximum intake diameter
1.94″. Maximum exhaust diameter 1.5″. Minimum Combustion Chamber volume 76cc.
Min combined deck clearance plus head gasket thickness .040″.
Maximum intake runner volume 160cc.
Maximum exhaust runner volume 60cc.
FORD: D5AE, D5AEA, D5AECA D5TE, D5TEDA, D5TEEB, D70A, D80E castings only. Maximum intake diameter 1.84″. Maximum exhaust diameter 1.55″. Minimum combustion chamber volume 69cc. (flat top piston)
Maximum intake runner volume of 125cc. (flat top piston)
Minimum combustion chamber volume of 60cc, and maximum intake runner volume of
140cc, a dished piston with .120″ cup must be used.
Minimum combined deck clearance plus head gasket thickness .070″ for all heads.
MOPAR: 3169974, 3671587, 3751357, 3751857, 3769596, 4027596 castings only.
Maximum intake diameter 1.88″. Maximum exhaust diameter 1.5″ (318); 1.6″(360).
Minimum combustion chamber volume 68cc.
Minimum combined deck clearance plus head gasket thickness with a flat top piston .110″.
Maximum intake runner volume 162cc.
Maximum exhaust runner volume 72cc.
All cylinder heads must have stock intake and exhaust valves and stock valve spring dimensions (1.275″ Chev, 1.437″ Ford, 1.5″MOPAR). Stock replacement stainless valves are permitted. Valve stem length, diameter and keeper group location must be stock. Steel retainers must be used.
No undercut valves.
No angle milling, porting, port matching, polishing, sandblasting, coating and/or blueprinting will be allowed. Heads may be milled for straightness only.
Stock rocker arms (or equiv. replacement) with stock ratios (GM and MOPAR 1.5, Ford 1.6).
Jam nuts are allowed.
No poly locks. No screw in studs or guide plates are allowed.
CRANKSHAFT: Only standard cast production design. Stroke may not be increased or decreased. Only standard factory OEM production steel or cast crankshafts with stock strokes permitted. Must have OEM readable numbers. No aftermarket crankshafts. Engine balancer must be OEM stock. It is to measure no less than 6” in diameter by 1” in thickness at outer edge.
MANIFOLDS: Stock cast iron intake (4 barrel with no adapter plates) and exhaust manifolds only. INTAKE: Must run stock cast iron intake manifold. No angle milling, porting, port matching, polishing, sandblasting, coating and/or blueprinting will be allowed. OEM numbers must be readable. EXHAUST: No ram horn manifolds. No inverted exhaust. No porting and/or polishing. Exhaust must exit behind the driver in front of rear wheel(s). Exhaust pipe must be 2” O.D. maximum from exhaust manifold to pipe exit. A single exhaust must use an OEM crossover pipe. If dual exhaust is used, pipes may not be joined (no balance pipe). Pipes must be tight at all joints and securely fastened.
AIR CLEANER: Air cleaners mandatory. Any OEM replacement O.K. as long as hood will cover it without modification. No ram air or cowl induction allowed. OEM pleated paper filter elements only.
OIL PAN/VALVE COVERS: Stock oil pans (unaltered) and stock valve covers. Must maintain PCV valve and crankcase breather to control oil vapor.
WATER PUMP: Stock water pump only. No aluminum.
FUEL PUMP: Mechanical fuel pump only in stock location. No belt driven fuel pumps.
OILING: OEM oil pump only. No dry sumps.
TIMING: Stock timing chain (or equivalent replacement). No belts.
STARTER: Stock OEM starter for engine used.
No small starters NO PMRG (Permanent Magnet Reduction Gear starters (e.g. Toyota) DISTRIBUTOR: Only stock distributor and stock type coil allowed. No dual points. No external amplifiers.
Distributor must be wired to match the FACTORY PRODUCTION FIRING ORDER ONLY.
– GM firing order is 1-8-4-3-6-5-7-2 – CHRYSLER firing order is 1-8-4-3-6-5-7-2 – FORD firing order is 1-3-7-2-6-5-4-8.
WIRES – OEM stock replacement plug wires or performance wires will be allowed. Wires MUST not be larger than 8mm and size must be clearly marked on wire insulation.
ENGINES For 305ci and Trucks – Block casting numbers must be readable (indicating block is a 305)
Block may be bored .030 to clean and square. Tech officials must be informed.
Heads must be stock 305 cast iron numbers readable, ie. 14014416, 367450 no vortec heads.
No decking block or planing heads other than to true up. Valves must be stock steel, Stock replacement stainless valves permitted. No swirl polished valves. Max size intake 1.85 exhaust 1.5.
Stock size hydraulic lifters (no mushroom type) and a hydraulic lifter camshaft with maximum valve lift as follows: intake .390 exhausts .410.
Compression ratio of 8.6:1(checked by whistler)
Aftermarket extra capacity oil pans are allowed. No cutting of cross member is permitted.

Tires and Wheels

Tires allowed will be 890 Hoosiers with no more than 5/32 tread depth, tire may also not dirameter under 55 at any point.
Wheels are 8×15 maximum.
Maximum wheel offset will be 2inches. All wheels must be the same backspace on all four corners.


Three speed OEM automatic transmission only. These are limited to GM THM 350, Chrysler 904, and Ford C4 models only.
Transmission must have three gears forward and one gear reverse, plus a neutral and a park position. Must have stock shift pattern. No reverse valve bodies.
It must be able to be shifted by the driver in position. No “slap stick” shifters.
Must have a stock torque converter.
Transmission cooler legal. Must be located in engine compartment. Recommend cooler be fitted with high pressure hoses and fittings.
Cars must start in neutral or park only.
Must have stock shift points. The transmission must be able to be automatically upshifted to high gear at 1500 RPM with vehicle rear wheels raised.
The OEM transmission must have an operating vacuum modulator. This unit is used on all of the OEM transmissions for this class.

Driver Safety

Five point harness is mandatory.
Harness must be worn whenever car is on racetrack. Harness build date must 2011 or newer.
Neck Collar is mandatory.
No tying, riveting, bolting, or any method other than a proper attachment will be acceptable. Snell approved helmets must be worn whenever car is on racetrack. Full face helmet use is mandatory.
A securely mounted, easily removed fire extinguisher is required, within easy reach of the driver. It must have a recharge slip dated no earlier than January 1st of the current year.
Fire extinguisher must be minimum of 2.5lbs.
Flame resistant driver suits must be worn whenever car is on racetrack. Flame resistant gloves and shoes must be worn whenever car is on racetrack Window net with quick release attachments is mandatory.
Drivers are responsible to ensure all safety equipment is in good condition and securely installed.

Speedway Miramichi reserves the right to confiscate and retain any parts or components that are deemed to be non-conforming to the rules set forth in these pages. The decision of track management will be final.

Two parallel bars attached to the front cage upright will extend forward and join the
Upright radiator support bars at the front. This will form the “front hoop”.
One cross bar will join the radiator upright support bars.
A maximum of one bar is permitted to run side to side in front of rad. Bracing will be
Toward the rear only (maximum 18″ back from rad).
A radiator mounting bracket may be used to allow for quick removal of radiator. It must fit under the hood and not extend in any way beyond the frame rails. All existing supportmembers for front fenders and rad support must remain (front shroud). No hood pins areto be mounted on this bracket. It is strictly for radiator support. Diagonal and circular bracing bars will be allowed to extend from the parallel bars to jointhe frame rails.
A single horizontal bar will be allowed to join the two parallel cage bars ahead of the firewall but behind the engine.
Two bars may extend diagonally from the above bar to join the parallel bars. Two bars are permitted to come forward off the front two uprights through the firewall and down to the frame. These bars must be welded to the frame behind the upper control arm mounts.
A foot protection bar must be installed on the driver’s side from the left front upright of
the cage to the frame but not ahead of the front firewall.
Center Roll Cage/Bracing (interior main cage)
The main cage will consist of four upright bars to form the cage perimeter. These
uprights must be welded to the frame. The two front bars will be angled back inside the
body “A” pillars. The rear bars will extend up to the roof. These four bars will be welded to the “halo” bars that will form the perimeter of the upper cage
Top of the roll cage halo bars must be touching the roof.
There must be a minimum of 3″ clearance between the driver’s helmet and top of the
The driver’s side door bars will consist of minimum of three parallel bars attached between the front and rear cage upright bars and angled out to the inside of the outer
door panel. The parallel bars must be joined by a minimum of six evenly spaced vertical
bars to support and strengthen the door bar construction.
The driver door bars MUST be filled in and covered with a minimum 1/8″ thick steel plate. This is MANDATORY on the driver’s side. Plating must cover all drivers’ door bar area.The passenger door bars may replicate the driver’s side but may also be constructed ofvertical and diagonal bars or x-braced forside impact protection.
There must be cross bracing or X-bracing in the rear of cage from side to side behind
the driver’s seat to allow for shoulder belt installation. There may be one bar mounted horizontally (parallel to floor pan) connecting the cross
brace bar and run straight to the dash bar. This bar MUST be padded.
A bar (“Petty bar”) connecting from the rear cage cross bar to run diagonally down to
and join the bottom of the right front cagebar or frame. No other bars will be allowed to
run off this bar.
Two bars (max) are recommended to run from side to side, attached to the roll cage or
bottom door bars, following the contour of the floor, to allow for seat installation. These
two bars will have the seat mounted to themdirectly and must not be fastened to the
frame or body of the car.
Rearward Roll Cage/Bracing (rear of cage to bumper-rear hoop)
A maximum of six bars may be attached to the rear of the center cage section. These
bars may be connected diagonally from the center cage bars rearward to the frame and
extend to the bumper. These bars may be cross or X-braced. Diagonal support bracing
may connect parallel rearward bars to frame rails.
Gussets are required at all welds around driver’s compartment. All welds must be
electric. Cage welding must be professional and will be subject to inspection. Any
cages not properly constructed will not be allowed to compete until repaired.
Minimum pipe size .095 wall thickness with minimum diameter 1.75″ od.
Gas tank protection required. Two pipes, behind the tank, off the frame at 90 degrees joined by one pipe across top no higher than the gas tank. A second pipe is allowed between the uprights (not welded to the frame). One brace is allowed from each upright pipe. Braces must be welded to the frame and be toward the front of the car only and must extend no further forward than 18″ from the uprights. None of the gas tank
protection can be welded, bolted, or in any other way fastened to any other bracing. It
may only be fastened to the frame.

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