Autocross Classifications for Tigers and Alpines

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• Download the autocross classifications for Alpines here
• Download the autocross classifications for Tigers here

Autocross Classification Summary – Tiger

Please see the full rules for complete classification requirements

	Stock	Street Prepared	Modified
Classification Intent	Stock engines, suspensions, tires and bodies; may be updated to the Mark II level.	Upgraded to improve the appearance, drivability, performance, handling and safety without modifying the basic body structure and suspension geometry; may be updated to the Mark II level.	Includes competition cars as well as highly modified Tigers.
General	Minimal performance options. Must be legally registered and licensed to drive on public streets.	LAT and other performance options allowed. Must be legally registered and licensed to drive on public streets.	Allows substantial modification of the body structure, power train and suspensions.
Body	Unmodified except for cutting of front valence for tire clearance.	Unmodified except for cutting of front valence and rolling back of inner lips of rear fenders for tire clearance.	Full tube construction with composite skin allowed. Body must have the appearance and silhouette of a Tiger. Fender flares allowed.
Engine	Must be stock Ford V8 of 260 or 289 cubic inch displacement with two or four barrel carburetor and stock exhaust manifold.	Must be Ford V8 of 260, 289, or 302 cubic inch displacement in the stock location. Aluminum blocks not allowed. Induction systems are limited to single or multiple carburetors or fuel injection.	Based on the Ford small block V8, iron or aluminum block, in the stock location with no limit to the bore and stroke. Any induction system is allowed.
Transmission	Limited to Borg-Warner T-10 or Ford Top Loader four-speed with either a “narrow or “wide” ratio.	Automatic transmissions or alternate manual transmissions (e.g. T-5 5 speed) are allowed.	Any manual or automatic transmission may be used.
Rear Axle	Limited to stock Salisbury axle with a 2.88:1 ratio and open differential.	Stock Salisbury axle must be used of any available ratio with open, limited slip or locked differential.	Any solid or independent rear axle is permitted.
Wheels	Maximum wheel size is 5 1/2″ X 13″. LAT70’s, or equivalent, are allowed. May be of any material.	Maximum wheel width of 7 inches is allowed. Wheels of any diameter may be used. May be of any material.	Any material and size is allowed.
Tires	Must have DOT approved tires with visible tread. DOT approved race tires may not be used.	Must have DOT approved tires. DOT approved race tires may be used. Only modifications allowed are having treads shaved or trued.	Any size, type or construction is allowed. Racing tires are allowed.
Front Suspension	Limited to stock suspension, attachment points, geometry, ride height and alignment.	Any springs, anti-roll bars, pivot bushings and shock absorbers may be used attached at the stock mounting points. Ride height may be altered.	Any front suspension is permitted.
Rear Suspension	Springs, attachment points and geometry must remain stock.	Leaf springs, panhard rod, and LAT or equivalent rear axle traction bars (attached at the stock LAT mounting points) are permitted. Spring rates, shock absorbers and ride heights may be altered. Rear anti-sway bars are not allowed.	Any rear suspension is permitted.
Steering	Rack and pinion, steering arms and resulting geometry must be stock.	Rack and pinion, steering arms and resulting geometry must be stock.	There are no restrictions.

Autocross Classification Summary – Alpine

Please see the full rules for complete classification requirements

	Stock	Street Prepared	Modified
Classification Intent	Stock engines, suspensions, tires and bodies; may be updated to the Series V level.	Upgraded to improve the appearance, drivability,performance, handling and safety without modifying the basic body structure and suspension geometry; may be updated to the Series V level.	Includes competition cars as well as highly modified Alpines.
General	No performance options. Must be legally registered and licensed to drive on public streets.	Performance options allowed. Must be legally registered and licensed to drive on public streets.	Allows substantial modification of the body structure, powertrain and suspensions.
Body	Unmodified except for cutting of front valence for tire clearance.	Unmodified except for cutting of front valence and rolling back of inner lips of rear fenders for tire clearance.	Full tube construction with composite skin allowed. Body must have the appearance and silhouette of an Alpine. Fender flares allowed.
Engine	Must be stock Alpine four-cylinder engine of 1492, 1592 or 1725 cc. displacement with stock Alpine intake and exhaust systems.	Must be stock Alpine four-cylinder engine of 1492, 1592 or 1725 cc. displacement. Webber carburetors allowed.	Any piston engine of no more than 6 cylinders or rotary engine swap is allowed. Any induction system is allowed.
Transmission	Alpine four-speed manual, four-speed manual with overdrive or automatic may be used.	Alpine four-speed manual, four-speed manual with overdrive or automatic may be used.	Any manual or automatic transmission may be used.
Rear Axle	Limited to stock 3.89:1 or 4.22:1 ratio and open differential.	Stock axles with a 3.89:1 or 4.22:1 ratio and an open, limited or locked differential may be used.	Any solid or independent rear axle is permitted.
Wheels	Maximum wheel size is limited to stock 4 1/2″ X 13″. May be of any material.	Maximum wheel width of 7 inches is allowed. Wheels of any diameter may be used. May be of any material.	Any material and size is allowed.
Tires	Must have DOT approved tires with visible tread. DOT approved race tires may not be used.	Must have DOT approved tires. DOT approved race tires may be used. Only modifications allowed are having treads shaved or trued.	Any size, type or construction is allowed. Racing tires are allowed.
Front Suspension	Limited to stock suspension, attachment points, geometry, ride height and alignment.	Any springs, anti-roll bars, pivot bushings and shock absorbers may be used attached at the stock mounting points. Ride height may be altered.	Any front suspension is permitted.
Rear Suspension	Springs, attachment points and geometry must remain stock.	Leaf springs attached at the stock mounting points are permitted. Spring rates, shock absorbers and ride heights may be altered. Rear anti-sway bars are not allowed.	Any rear suspension is permitted.
Steering	Recirculating ball and stock geometry must be used.	Recirculating ball and stock geometry must be used.	There are no restrictions.