1967 NASCAR International Stock Car Racing Rule Book NASCAR Grand National Championship Circuit Section 20-4 -- Suspensions

a. Heavy duty springs may be used if similar to original equipment.

b. Sway bars may be reinforced. Additional sway bars permitted.

c. Front end suspensions must be reinforced for safety. Heavy duty spindles and bearings compulsory.

d. Camber: 4 ° maximum.

e. Wheelbase: AMA specs apply. Standard plus or minus 1/2 inch. Both front A-frames may be moved forward not more than 1 inch from original position. Left and right must agree. Wheelbase must remain the same as manufactured, as referenced by measurements from front door jam post to front axle.

f. Tread, front and rear: AMA specs apply plus or minus not over one inch tolerance on either side to allow for reinforcement of wheels and hubs, measured at center of tire, zero toe-in at spindle height, standard not offset.

g. No mechanical or hydraulic device will be permitted in order for driver to shift weight while in motion. No hydraulic weight shifting devices permitted at any time.

h. Minimum of ground clearance of 6 1/2 inches on the left side, measured from the lowest part of frame or body, and not more than 2 inches higher on the right side, measured from the lowest part of frame or body. Oil pan minimum ground clearance 5 inches; exhaust pipe minimum ground clearance 4 inches. (Use of any special device to obtain minimum ground clearance will subject the car to disqualification because such device may become dislodged while car is in motion, thereby lowering the car below the approved ground clearance.) Violation of this rule will result in fine