Nostalgia Funny Car
N/FC, preceded by number.
Reserved for pre-1980 Automobile bodied, nitro-burning Funny Cars built specifically
for all-out drag racing competition. Minimum weight at conclusion of run: 2,250
pounds, including driver.
Speeds of 250 mph and/or elapsed times in the 5.90-second range will require a
Re evaluation of performance restrictions.
REQUIREMENTS & SPECIFICATIONS
Any internal-combustion, OEM-type engine permitted. Maximum
cubic inches 500; maximum bore centre spacing 4.840 inches, must maintain bore
centres +/- .015-inch from stock. Blocks and cylinder heads must retain all physical
characteristics of stock-production components. Billet blocks permitted. Any new block
design must be submitted to NHRA Technical Services Department for acceptance.
Alloy and billet heads allowed. Accepted billet heads and block must remain as
manufactured. Machining of billet heads or billet blocks to reduce weight is prohibited.
OEM cylinder-head bolt pattern mandatory for all cylinder-head types. Cylinder heads
must retain stock OEM-valve angles.
Engine must be equipped with an SFI Spec 7.1 lower-engine-ballistic/restraint device.
In addition it is advised that an engine oil-retention pan is utilised; minimum material .050-inch
aluminium or .040-inch carbon fiber/Kevlar. Pan must extend from framerail to
framerail and extend from the rear motorplate to minimum 1 inch forward of the front
face of the lower pulley and must incorporate minimum 4-inch-high vertical folded-up
walls on the sides and minimum 2 inches on front and rear. Front and rear walls must
be “coved” toward oil pan to assist oil in staying within the confines of the oil-retention
pan. Pan must be either a one-piece design or constructed as to be sealed as a
retention device to retain oil. Minimum number of slots or holes in the walls to clear
frame, steering, or lines permitted. A non-flammable, oil-absorbent liner advised
inside of retention device.
Double-pipe insulated exhaust headers mandatory. Double tube must extend to start
of bend at bottom of body.
Nitromethane and methanol permitted (65% minimum nitromethane). All other fuels prohibited.
Single fuel pump mandatory. Fuel pump must be of an accepted design - accepted
fuel pumps: Enderle 1200, 1270, and 1380, Settles Nitro Gerotor, Waterman
320950N or 320950, and Rage Racing 1400N-FC. Fuel pumps must retain as-manufactured gear or
rotor outside diameter, depth, and tooth/lobe count. Fuel pumps with a second outlet
must have one of the outlets capped or routed back to the fuel tank or return system.
Fuel pump restricted to a total fuel delivery limited to 21.0 gpm at 4,000 rpm pump
speed measured through a 0.300-inch orifice.
Fuel tank and fuel lines must be within the confines of the frame and be protected
from coming in contact with the track surface. Fuel lines in the driver’s compartment
prohibited except for a fuel-pressure gauge; lines must be steel or steel-braided with
Must have fuel shutoff operable from the driver’s seat. Fuel tank must be equipped with a
positive locking screw-on cap.
Maximum number of nozzles 24 (maximum 8 in injector hat, 16 in manifold). Y nozzles
may be used in lieu of individual nozzles in the manifold; limited to 16 nozzle
jets. Down nozzles prohibited. Maximum fuel injector air inlet opening: 45 square
inches measured at butterfly or throttle bodies, excluding cross shaft in fully open
No composite materials (i.e., carbon fibre/Kevlar, graphite, etc.) can be used in injector
hat and/or scoop. Hat/scoop must be nostalgic in appearance, internal modifications
allowed. Scoops limited to 12 1/2 inches above throttle body as measured from
centreline of throttle shaft to top of scoop. The use of electric, pneumatic, or any other
automatic way of switching or sequencing of fuel system is prohibited. Fuel system
must operate on its own pressure as far as adding or subtracting fuel volume. Manual
high-speed fuel system allowed.
Restricted to Roots-type supercharger; rotor helix angle not to exceed that of
standard 71-series GM-type rotor. High-helix prohibited. Limited to a single, Roots-type
6.71 blower.Specification limits: 15-inch rotor length, 18.250-inch case length, and 5.840-inch
rotor cavity diameter. Rotors must be driven from the front; both external drive and
internal gearing. Rotor helix angle limited to standard 71 series GM-type rotor (60
degrees). Maximum overdrive: 18.99 percent. Blower setback may not allow any
portion of blower to extend behind bellhousing mounting surface on cylinder block.
Spacer or components between top of supercharger case and bottom of fuel injector
hat restricted to 2-inch maximum. Supercharger restraint system meeting SFI Spec
14.3 mandatory. Aluminium studs required. Manifold burst panel meeting SFI Spec
23.1 mandatory. Manifolds are limited to a maximum manifold height of 8 inches as
measured from valley gasket surface to blower mounting surface. Supercharger belt
guard mandatory. Fuel and/or oil lines must be shielded wherever they pass the
supercharger drive belt. Either a belt guard or fuel/oil line guard permitted.
Turbochargers, screw-type superchargers, and centrifugal-type superchargers
Throttle control must be manually operated by driver’s foot; electronics, pneumatics,
hydraulics, or any other device may in no way affect the throttle operation. Throttle
must incorporate a positive-action return system.
Cast or fabricated metal valve covers using all attachment bolts mandatory. Carbon
fibre/composite valve covers prohibited.
Vent tubes must be double clamped at each connection. Minimum diameter, 1 1/4
inches for all breather tubes. All quick connections in the system must have a
secondary locking system (tape, wire ties, etc. not allowed). Minimum catch-can(s)
capacity is an 8-quart sump. Catch can(s) must have adequate internal baffling to
prevent oil from being deposited on racing surface.
See General Regulations DRIVETRAIN: 2
CLUTCH, FLYWHEEL, FLYWHEEL SHIELD
Flywheel and clutch meeting SFI Spec 1.3 or 1.4 and flywheel shield meeting SFI
Spec 6.2 mandatory. Clutch management system prohibited. Maximum number of
discs three, maximum number of fingers six. Release of clutch must be the result of a
manual operation by the driver’s foot. No staged systems allowed.
Driveline must be covered in .024-inch steel or .0625-inch aluminium 360-degree full
cover. Couplers mandatory. Rear cover must surround the coupler. Front cover must
surround the driveshaft from the back of the reverser to the end of the splicer sleeve
in the area of the driver’s leg. All covers must be securely mounted to frame, either by
a suitable crossmember or third member.
Rear-end gear ratio minimum (numeric) 3.90:1. Aftermarket full-floating or live axle
Two-speed transmission and reverser required. Transmission must be planetary-type
design. OEM or Powerglide-type units prohibited. A ballistic shield covering all units
mandatory; must meet SFI Spec 4.1.
BRAKES & SUSPENSION: 3
Four-wheel hydraulic brakes mandatory. Application and release of brakes must be a
function of the driver; electronics, pneumatics, or any other device may in no way
affect or assist brake operation. Hand brake, if used, must be located inside body or
driver compartment. Steel brake lines mandatory, fireproof brake-line covering mandatory on all
(front and rear) flexible connection lines.
Conventional automotive-type rod ends must be a minimum of 3/8-inch shank
diameter and must be installed with washers to prevent bearing pullout. Removable
steering wheel, if used, must meet SFI Spec 42.1.
Permitted. Must be secured with minimum of two 3/8-inch, Grade 8 fasteners, per
Minimum 3 inches from front of car to 12 inches behind centreline of axle; 2 inches
for the remainder of the car, except oil pan and headers.
Dual parachutes mandatory. Two separate shroud-line mounting points mandatory
with sleeved 1/2-inch-minimum Grade 8 steel bolts with self-locking nuts or with nuts
welded onto parachute brackets. Shroud-line mounting brackets must be constructed
of minimum 3/16-inch 4130 steel. Fire-resistant protective covers must be on all
parachute packs and unpacked shroud lines.
Chassis must have manufacturer’s name, serial number, and date of manufacture.
Chassis must meet SFI Spec 10.1E. Plating of chassis prohibited; painting permitted.
Chassis must be inspected yearly and have serialized sticker affixed to
frame before participation. Roll-cage padding meeting SFI Spec 45.1 mandatory where
driver’s helmet may come in contact with roll-cage components. Additional padding,
mounted on flat stock and fastened to the roll cage on both sides of the driver's helmet,
advisory. Additional padding must be NHRA-accepted, securely mounted using bolts or
locking fasteners, and must include a flame-retardant covering. A current list of NHRA accepted
lateral head supports is available on NHRARacer.com. Pressurization of
framerails in lieu of air bottles is prohibited.
Rigid rear suspension mandatory. Front suspension optional.
Minimum: 112 inches; maximum: 125 inches, measured on long side. Maximum
wheelbase variation from left to right: 2 inches.
TIRES & WHEELS: 5
Race-only spec tires on front mandatory. Size of rear tires limited to 34.6-inch
diameter x 17-inch wide.
Must be either beadlock design or use of a liner mandatory on non-beadlock wheels.
Minimum SFI spec 15.1.
Driver-compartment interior, firewall, seat, etc. must be aluminium or steel.
Magnesium or carbon fibre prohibited.
Minimum one-layer, flame-retardant-material mandatory as seat upholstery.
Limited to 1965 to 1979 Automobile bodies. Bodies must resemble the original
mass-produced make and model. Corvette roadster and Jeep bodies permitted.
Bodies may be made of fiberglass or composite material. Body must lift off as a one
Piece unit. Minimum body width is 60 inches, measured at the centreline of the front
and rear axle. Maximum lowering of roof height: 2 inches. Front fender bubbles
allowed, maximum 2 1/2 inches. The body may be shortened or lengthened a
maximum of 15 percent of original dimensions. Opening for blower hat must have a
minimum 2.500-inch clearance between body and throttle linkage. Injector box in
windshield cannot exceed 50 percent of windshield height. Any modifications to body
not described are prohibited. Side windows prohibited. Exception: Vent windows
permitted, may not extend 2 inches rearward where the A-pillar meets the roof line.
Window must be perpendicular to the bottom of the side window frame.
A means of relieving excess pressure under the body mandatory, either a sufficient
opening in the area around the manifold burst panel is required or by means of a Body
(hood) burst panel, minimum 288 square inches, mandatory. Body burst panel must be
secured with plastic screws and two 1/8-inch stainless-steel wires, with body pad
bolted with plate on both sides of panel. Fireproof body undercoating required.
Body rear mount must be a quick release type operated by a “T” handle on the rear of the
car to aid body removal in the event of an accident.
A working escape hatch must be installed in top of body to permit easy driver exit;
see-through types prohibited. Minimum size,18 inches x 17 inches. Roof hatch must
be permanently attached and hinged at front. Must have release mechanism,
operable from both inside and outside of car.
FIREWALL & FLOORS
Must be constructed of .032-inch aluminium or .024-inch steel, magnesium or composite
materials prohibited. Firewall must completely seal driver from engine compartment per NHRA
specs and be equipped with fire windows measuring no greater than 25 square inches on
either side of the firewall in the vicinity of the valve covers to warn driver of fire. Laminated
safety glass or fire resistant plastics such as Lexan or Plex70 mandatory.
Rear spoiler limited to roof height and body width (modern-type spoilers or spill plates
prohibited). Spill plates may not extend forward of the bottom of the rear window or
extend past the trailing edge of the rear deck lid. Spill plates cannot be above the roof
line. Front spoiler limited to overall overhang measurement of 40 inches, measured
from the centreline of the forward most front spindle. The front and rear spoilers are the
only aerodynamic devices permitted; any other wings, spoilers, or canards prohibited.
Data recorders permitted. Cannot perform any function in fuel, clutch, or driver
Single mag limited to point-type only and single coil (no electronic mags or mag amp
boxes allowed). Timing retard must be a function of the driver by mechanical or
pneumatic means only. A positive ignition shutoff within the reach of the driver is
SUPPORT GROUP: 9
Fire extinguishing system must meet SFI Spec 17.1. Minimum 20-pound or more fire
extinguishing system mandatory. System must be divided so that a minimum of 15
pounds is directed into engine compartment by means of nozzled outlets placed in
front of each bank of exhaust headers. Remaining 5 pounds or more should be
dispersed in driver compartment by means of an atomizing nozzle placed at driver’s
feet. Must be installed per manufacturer’s specifications. Fire-bottle activation cables
must be installed inside framerail where cable passes engine/bellhousing area.
Carbon-fibre bottles prohibited.
JACKS AND JACK STANDS
No work may be done under any car in the pits while supported by a jack. No car may be
fired while on a jack. Jack stands are required while work is performed or while car is
being warmed up; a licensed driver must be in the seat anytime the motor is being run.
Jack-stand devices must provide a minimum ground clearance of 7 inches from bottom of
rear tire to ground while car is running.
When starting vehicle in the pit area, vehicle must be fully within the confines of the
assigned space. No part of the car may extend past the trailer.
Valid MSA or equivalent license mandatory.
DRIVER RESTRAINT SYSTEM
Minimum 5-point, 3-inch driver restraint system meeting SFI Spec 16.1 or FIA 8853/98b mandatory.
All belts and mounting points must be covered with a fire-resistant material. Restraint
systems must be updated at the specified year intervals from date of manufacture.
Full-face helmet with shield meeting Snell SA2005 or SFI 31.2A, or 31.1/2005 Specs
mandatory. Helmet must meet applicable SFI and/or Snell specs, fresh air system
advised using compressed air only. Air can be supplied on demand or by constant
HEAD AND NECK RESTRAINT DEVICE/SYSTEM
At all times that the driver is in the race vehicle, from the ready line until the vehicle is
on the return road, driver must properly utilize a head and neck restraint system, this can either be
a fully homologated FIA device or an SFI-approved head and neck restraint device/system, including
connecting the helmet as required for full functionality of the device. The device/system must meet
the appropriate FIA specification or SFI Spec 38.1 and must display a valid label. The head and neck
restraint device/system, when connected, must conform to the manufacturer’s mounting instructions,
and it must be configured, maintained, and used in accordance with the manufacturer’s instructions.
Driver’s suit meeting SFI Spec 3.2A/20, gloves 3.2A/20 boots 3.2A/20 and head sock 3.3
mandatory. All jacket and pants or driver suits that meet SFI Spec 3.2A/20 must be
recertified on a five-year interval. A head sock is not mandatory when helmet is
manufactured with a skirt labelled as meeting SFI Spec. 3.3.