RULES FOR 2021
(Governed By The O.T.R.A. Tech & Safety Committee)
1) 1928-1940 Canadian or American coupes, 2 door and 4 door sedans. To be stock appearing. (Effort must be made to keep
rear wheels in wheel well openings). Steel bodies only. Steel metal or aluminum for damaged panel replacement.
2) Minimum height 5 feet to top of original body panel. No bending of roof panels to meet height. No adding any type of
trim to meet height.
3) Engine hood to be solid and cover top of radiator and air cleaner, back to main body of car. Some cars have hood air
cleaner interference so a bubble can be installed with a maximum height of 2 inches. Air cleaner adapters not to be longer
than 30 inches measured from carburator air horn on outside arc of any curve to cleaner element and must remain under hood.
4) Windshield's Lexan allowed for safety. No side windows. No forming of metal panels either inside or out to act like
a spoiler or wing (Vertical or Horizontal). No ducting of air directly into carb. unless approved by tech
5) Cars to be constructed on original manufacturers steel frame but need not be make for make. No aftermarket steel tubing
to be in main rails between the center of front axle and center of rear axle. Minimum wheel base 100 inches. No jigged or
home made frames to be allowed.Maximum 79 inch track width tire buldge to tire buldge.
5(a)Minimum frame height 5 inches NO UNDERSLUNG FRAMES
6) Minimum weight 2300 lbs. including driver 56.0% maximum left side weight
7) Car to have (steel) leaf spring suspension front and rear. No monoleaf suspension. No independent suspension. Solid
front axles only, or aftermarket stock appearing axles, (with tech approval).. No coil over shocks. Front axles could have
center section repaired with square tubing to go from drop section of axle to drop section original drop to be retained. Maximum
length of tubing 42 inches Flanged axle ends are permitted
8) No rack and pinion steering.
9) Any stock North American OEM production 3 ,4 or 5 speed manual , automatic transmission, coupler optional (all gears
9a) Automatic Trans cooler lines too be steel double flared. A maximum of 4 inches of Hi pressure hose double clamped.
9b) All vent lines to be sealed and plumbed to a minimum 4 liter catch can.
All Automatic Transmission Installations Are To Be Teched Before The Car Runs :
10) On existing cars, bodies to be centered on frame. All newly built cars to have frame and body centered on front and
rear axles. No offset allowed. Bumpers to be 16 inches from center to ground and have finished edges, if you have wrap around
bumper needs to be secured to frame. Side rails (Nerf Bars) to be a two bar system on both sides of car to prevent wheels
from getting entangled with other cars.
11) Car numbers to be a minimum of 16 inches. In Height and appear on both sides of the vehicle. Auxiliary numbers to
appear on top right rear corner. If space does not permit, the hood is acceptable.
ENGINES: Rules Frozen until the 2019 season
12) Only Canadian or American oem in-line 6 cylinder or flat heads V-8s allowed. 310 cu. in. Maximum
13) Stock heads only, with stock valve size, make for make. No porting, polishing or any other method of enlarging or
cleaning intake ports, exhaust ports, or combustion chambers allowed. Gaskets can be cut to match head or intake manifold.
Surface grinding and replacement of stock valves with high performance is allowed as long as stock valve size is retained.
Machining of heads for HP valve springs allowed. Screw in studs and roller rockers allowed. (heads can be teched and sealed
13a) Flat tappet camshafts only. No mushroom or roller lifters must be stock make for make Flat tappet lifters.
14) CLUB CARBURATOR Rochester 250 or 292 Mono Jet with a maximum of 1 11/16 throttle bore. Stock intake manifold. No
alterations unless approved by Tech. No Holley 1 11/16 rebuilt carbs permitted Rochester only
15) No engine offsets permitted. Engine to be centered between frame rails and mounted perpendicular. Slant six dodge
allowed. Center of crank at 13.5 inches high minimum
16) No radical engine set backs. Minimum distance of 62 inches from center of rear axle to rear of engine casting (Bell
housing surface). Maximum of 8 inches from center of front axle to vibration damper.
17) Exhaust system optional but must be muffled to meet dB requirements at tracks. Must exit behind driver. Will be enforced.
Maximum 85 Decibels!
18) No electric Fuel pumps. No Alcohol or Methanol.
19) Disc type clutches only.
NOTE: Engine could be torn down. If engine is legal O.T.R.A. will pay for necessary gaskets. However, anyone caught cheating
could be banned from racing O.T.R.A. events for 12 months. This includes car & driver (one time rotating drivers could
be excluded). Any suspensions will remain on car even if sold. If its not in the rules it is illegal unless approved by Tech.
20) Four tires are to be Hoosiers 970. No option may be used, with a maximum 8 inch tread width. May use old American
Racers tires until worn out. Tire softener permitted
21) Wheels are to be 8 inch maximum width of steel construction. Wide 5 bolt pattern permitted
21a) Any thing not specifically covered in these rules is not considered legal. Anything that was considered legal in
the past superseded by this book. Any interpretation and the intent of these rules will be ruled upon by the head tech, race
director and the technical committee.
22)Rear gears are allowed to be open welded or locked with,a mini spool or full spool. No Electronic Traction Control,No
free wheeling Lockers and no Quick Change rear ends Permitted
Minimum Of 2 people on the Tech/Safety Committee or executive with Tech to inspect all cars. All Cars Must Pass inspection
prior to running an O.T.R.A. race.
If a car is obviously not ready (E.g. too low too light or too noisy etc.) then it doesn't race or collect tow money until
fixed Tech may give one race grace.
23) Roll Cage; Main bars to be cross braced and corner gusseted. Diagonal brace forward and rearward from main cage. Wall
thickness to be 1/8in(.125) wall for pipe or .095 for tubing for all bars in cage, Minimum 1 1/2 inch. OD. Three door bars
required on drivers side and two on passenger side, as close to outside parameter of car as possible. Two upright bars between
each bar to frame required. Roll Cage to be welded to frame at 6 points. Inspection holes to be drilled in main bars to check
thickness. One center bar in cage roof. No exhaust tubing. All cars to have side rub rails neat in appearance.
24) Roll Bars in close proximity of driver to be padded with roll bar padding. Top brace to be welded so that wheels or
bumpers cannot go through roof onto driver.
25) All doors to be securely fastened to body.
26) Cars to have full floor boards to meet body panels on both sides. Full firewalls front and rear are required.
27) Seat to be bolted to roll cage or frame Not To Floor Boards. Seat to be a high back aluminum manufactured seat. Home
built seat not allowed. (Full containment seat monitored by 2019)
28) Steering wheel centers to be padded
29) Main seat belt and racing harness to be approved racing type. No more then five years old from date of manufacture,
date must be on belt or approved by tech.
30) A 2 1/2 lb. dry chemical fire extinguisher is to be in your pit area and accessible.
31) Fuel Cells to be strapped in trunk and have screw on caps and proper venting. Cells are to be red and guarded and
passed by tech.
( Fuel Cells Mandatory)
32) Radiator catch cans to be securely mounted outside drivers compartment.
33) Four wheel hydraulic brakes in working order. Disc on front only, Vented OEM rotor and cast brake calipers Single
piston Calipers Mandatory. No cross drilled rotors. Must have Dual master cylinder.
34) All drive shafts must have 360 degree metal hoop securely fastened behind front universal joint 1/4 X 1 inch steel.
Drive shaft to be white
35) Drivers to have approved Snell SA 2010(or Better) helmets and" approved" 2 layer fire retardant driving suits(or single
layer plus fire retardant underwear)Driving gloves and shoes. Head and neck restraint mandatory
36) Driver must use arm restraints with open roof or window net and closed roof
37) All Cars to be equipped with scatter shields or suitable belting to cover bell housing.
38) A battery kill switch must be mounted on the right side of the vehicle on the bars and well marked.
39) All bolted on weight must be painted white and have car number on weight
40) Cars holding issued numbers that do not compete during one year forfeit number.
41) Drivers to have Valid drivers license or approved by O.T.R.A. Executive.
42) Anybody driving an O.T.R.A. car must have valid current membership prior to competing
43) Any driver not obeying the flags can be suspended for 1 race event. The flagman is to deal with the pit boss and
highest ranking executive member at the track. NOT THE DRIVER. Any additional penalties will be handed down within 24 hours
44) No lights on exterior of car on while in motion.
45 Duel file restarts, All lapped cars to go to the inside line. If you are involved in yellow flag you go to the back
of the inside line
Crew to consist of driver and crew members. No alcoholic beverages in pits until the final checkered flag drops. It would
be appreciated if each car owner would make sure the pit area is cleaned after the race meet. This will leave a good impression
of our group with track owners/promoters.
No O.T.R.A. member or guest to create any disturbance at tracks. No foul language toward track personnel, other members
or track management. Unsportsmanlike or immature conduct (e.g. rat racing in pits, fighting) at the track will not be tolerated
and will be dealt with by the executive. Direct any problems to O.T.R.A. executive members. Car owners are responsible for
the actions of their crew etc..
The O.T.R.A. executive and pit officials will initiate penalties on offence. (e.g. loss of tow money or loss of privileges
** Please line up your Race cars when requested to do so. This assists our pit boss's as well. This help makes our show
look more organized and professional. Remember we are here to put on a good show for the fans and promote the sport of auto
racing. One crew member to remain with the car at all times.
O.T.R.A. Tech & Safety Committee BR>
Rule No. 13 states that engines will have stock heads only, with stock valve sizes. Manufacturer's specifications define
stock valve sizes as follows:
Ford - 170, 200, 250 1.750 1.390
Ford - 223, 262 1.780 1.510
Ford - 240, 300 1.781 1.560
GM - 194, 230, 250, 292 1.720 1.500
GM - 235 1.937 1.500
GM - 261 (Pontiac) 1.875 1.500
Chrysler - 170, 198, 225 1.620 1.360
AMC - 223, 258 1.787 1.406 BR>
The above measurements are the only measurements acceptable to the Tech & Safety committee for the stated engines.
If your engine is not listed, or if you have any questions, please contact one of the Tech & Safety Committee .
Rules are frozen until the next rules meeting to be held after the season.