12.0s   Suspension - Chassis  Type

Tread width Max 72.0 inches or less If over add 10 lbs per inch or 5 lbs per 1/2 inch to the right side   Front suspension Safety Hub Permitted must be steel Front Sway Bar  Any GM 1 piece stock type front sway bar 1 piece Max 1 and 1/2 inches Adjustable front mounts on sway bar are not allowed. Spindles: Stock or one piece after-market steel (cast Iron) replacement permitted must adapt stock rotors, must adapt stock calipers must be mounted behind ball joints must adapt steering components. must accept stock hardware Upper A-Frames After-market steel tubular upper A-frames permitted. A-frames must be one piece frame with steel cross shaft  lengths may be different. No adjustable frames.  Ball joints maybe changed. Front upper A-frame mounts may be changed and relocated;  mounts must be similar to stock no adjustable slide mounts. Lower A Frames must remain stock for chassis being used. may not be altered or moved from original locations. After-market bushings permitted   Inner and Outer Tie Rod Ends  /  Sleeve Heim joints may replace tie rod ends Aftermarket sleeve may replace stock OEM sleeve   Centerlink Replacement with altered geometry allowed Only non-adjustable Springs Steel - Magnetic Spacers permitted Jacking bolts allowed May not be custom wound No coil over springs allowed No coil over eliminators allowed Must be mounted in stock location Minimum 5 inches Minimum front spring race 550 lbs Spring must be readily available for purchase for less than  $100.00   Shocks/Struts Must mount directly to lower control arm 1 shock per wheel No bump stops or travel limiting devices Steel Shock/Strut must be readily available for purchase for $150.00 Shock/Strut can be claimed by series or any competitor for $175.00 Bushings No eccentric bushings No non-factory adjustable devices allowed on the suspension   No devices are allowed that tie down, limit, or restrict front suspension travel.  These include but are not  limited to Bump Stops, Coil Spring Binding, Chains, etc.   Rear Suspension  (Does not include axle housing, gears, axles, etc.) Rear Sway bar is not allowed Springs Steel - Magnetic Spacers permitted Jacking Bolts Allowed May not be custom wound No coil over springs allowed No coil over eliminators allowed Must be mounted in stock location Minimum 5 inches Coil Spring must be readily available for purchase for less than  $100.00 Leaf Springs allowed: Steel only. Springs must remain in stock mounting position. Bushings may be aftermarket. Lowering blocks permitted. Shackles may be adjustable above spring. Slider mounts permitted.   Spring Buckets Rear coil spring buckets may be fabricated Must be installed with coil springs Must be centered directly above axle tubes.   Shocks May be relocated 1 shock per wheel No bump stops or travel limiting devices Steel Must be readily available for purchase for $150.00 Must be used unaltered without modification. Shock can be claimed by series or any competitor for $175.00 Rear J Bolts allowed   Trailing Arms Upper and lower trailing arms may be changed. Upper and lower trailing arms must be in stock location Trailing arms may be aluminum  No add-ons will be allowed on any arm. Upper links may be changed to one. Maximum trailing arm lengths, upper 18-inches / lower 24" inches (measured at center of pivot points).  Arms located close to driver must install ¼” steel plates  must be positioned in front of arm to divert travel downward if connection is broken. Steel rod ends, spherical bushings or similar connections allowed.   Trac bar/ Pan hard bar Pan hard bar permitted Behind rear end only (coil spring cars only). Placement off pinion not permitted. J bar not allowed. 3 link suspension must add 35 lbs to the right side of car. Bushings No eccentric bushings No non-factory adjustable devices allowed on the suspension   No devices are allowed that tie down, limit, or restrict front suspension travel.  These include but are not  limited to Bump Stops, Coil Spring Binding, Chains, etc. Chains to raise rear end are allowed  Frame rail to raise 3 inches before rear tire is raised