2021 Hobby 602

Hobby 602

2021 Rules




  1. Nothing newer than 2016 model unless approved by track. Any updates to cars from their original year model must be approved. Decisions will be made to keep fairness and affordability. We have other classes to run if you want to spend more money and use more advanced suspension technology. 


  1. Lucas oil, Ultimate, SAS body rules apply 
  2. 8” spoiler permitted 
  3. No 12” side braces allowed 


1. No oil filled hubs 

Rear End

1. No 8″ ring gears 


  1. Bert or Brinn permitted. 
  2. Steel, aluminum and carbon fiber driveshaft permitted 

Shocks & Springs 

  1. Oil or gas shocks permitted nonadjustable 
  2. Split valve shocks permitted (Steel or aluminum) 
  3. No canister remote or externally adjustable shocks permitted 
  4. One working shock per wheel, except left rear 
  5. Shock claim rule: $200 per shock all hardware removed 
  6. 1 Standard spring per wheel and 5th coil. 10in minimum spring length. Barrel springs ok.

Linear spring rates only. 

  • One bump stop right front only. No stack springs. 
  • Must be 4in of shock shaft showing at ride height on right front. We measure center to center on shock bolts. Remove from car. Remove spring. Compress shock completely by hand. Measure center to center. Subtract that measurement from ride height measurement. Must be minimum of 4 in. 
  • 350lb x 10in minimum on right front will be checked with spring rubbers out. Must be a linear spring. Must gain 350lbs for 4 inches of travel. 10lb tolerance per inch. 
  • Spring rubbers allowed 
  • No altering of top shock mounts from manufacturers standard for yr. model. 
  • 3 1⁄2 in maximum distance from center of lower ball joint to center of lower shock mount. No Tolerance
  • Any right front spring and 1 bump stop permitted. Drop rule applied.
  • We have classes for more advanced suspension technology if that is what you wish to do. 


  1. 650 CFM. New or rebuilt only 
  2. One spacer plate. 1 inch only. 
  3. No more than 2 thin standard gaskets 


  1. 602 GM must meet all GM specifications. 
  2. Distributor: Factory type HEI with no external coil. Aftermarket ok. Must chip at 6300. Must have soft touch box. No wire loom. Must be within 12” of the distributor (inside the  engine compartment.) $250 Distributor Claim rule. 
  3. MSD Allowed. 
  4. All accessories must be front mounted 
  5. $4000.00 claim rule as comes from factory, with distributor. Excludes accessories. 


  1. No Tri-Y 
  2. No stainless 
  3. No Bayea headers 
  4. Claim rule ($300.00) 

Items not Allowed: 

1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 

Fuel: 1. 

Tires: 1. 

AR 48 spec

Hoosier HTS 1350 spec

Crate USA 21


NO SIPPING (may cut existing groves with #1 blade ONLY)

Spools or welded rear differential only

No springs rods

No air spring shocks. Shocks must fully compress by hand with spring removed.

No lead bolted to rear end housing.

Aluminum wheel spacers only.

No air bags

No air dump systems

No air springs

No air bump stops

Any new components that have not been standard parts in recent years must be approved and announced to everyone involved before it is legal to run. 

Pump gas or 110 permitted. No E85 or oxygenated fuels allowed. We do have equipment to check for oxygenated fuel. 

American Racers Spec 48 


  1. Sealed engines 2400lbs. GM Seals 
  2. Unsealed 2450lbs or series sealed 
  3. Head and neck restraints, full containment seat, and on-board fire extinguisher  system are recommended. 

Weight penalties may apply for anyone with a rule infraction 

Hobby Rules: Frame & Chassis: 

  1. Automotive frames permitted 
  2. Automotive snout must include: cross member, spring pockets, horns, and attaching rail  as one complete unit as it was assembled at the factory. May trim spring pockets for  clearance of racing springs and spring buckets. 
  3. Wheelbase of 103” on snout frames or stock for make and model on stock frame 


  1. Coil over springs permitted on rear. Outboard on front. No coil-over on front.’ 
  2. Jack bolts, racing springs, and racing shock permitted (4” min. spring.) 
  3. Racing leaf springs permitted – steel or fiberglass on rear (one type only) 
  4. Bottom A-Frame must be stock – no shortening or lengthening allowed 
  5. Top A-Frame may be tubular, but only be adjustable at the mounting plates to frame 
  6. Any GM or Ford spindle or racing spindle permitted 
  7. Front spring pockets must be in original location 
  8. No 5th coils. Air shock permitted 
  9. Lift bars permitted. Fiberglass/ pan hard bar/ solid rubber biscuit permitted 
  10. Coil over eliminators permitted 
  11. 3-link hook up/ no 4 link hook-ups. 
  12. Split valve steel shocks permitted (steel or aluminum) 


  1. Rack and pinion permitted 
  2. Power steering permitted 

Rear End: 

  1. Stock type rear end or equivalent 
  2. May be locked 
  3. Quick-change rear ends permitted 


  1. OEM standard production 3 or 4 speed permitted 
  2. Must have 1 forward and 1 backward gear 
  3. Bert or Brinn permitted 


1. Ultimate, SAS, SESS, Fastrak, rules apply 


  1. Must be track approved 
  2. No sharp or exploded edges 
  3. Bracing permitted 


  1. 362 cubic inches maximum 
  2. Flat top pistons 
  3. Any hydraulic or solid lift cam permitted, no roller cams 
  4. Lifter valley may be polished 
  5. Headers permitted, exhaust must exit parallel to ground 
  6. Any stock, steel, or cast crankshaft permitted, stock stroke for motor 
  7. Stock appearing rods permitted, no H-beam, or billet rods permitted 6.0” maximum 
  8. Any wet sump oil pan permitted, internal pump only 
  9. Engine may be balanced, crankshaft must appear stock except for drilling or welding for  balancing 
  10. No ground or knife-edge counter weights permitted 
  11. Sealed crate 602 allowed 

Engine Placement: 

  1. Engine and drive line must be in center of car, half the distance of the ball joints 
  2. Number 1 spark plug of Chevrolet must be no more than 2” to the center of top ball joint 
  3. Number 1 spark plug of Ford “302” & “351” must be no more than 4” to the center of top 

ball joint 


  1. Cast iron ONLY 
  2. Straight plug heads or angle plug heads permitted 
  3. Vortec or 300lbs heads permitted 
  4. Approved stock replacement heads permitted 
  5. Double springs 
  6. Roller rockers permitted. No shaft rockers 
  7. Screw in studs and guide plates permitted 
  8. Stud girdles permitted 
  9. No more than three angle valve job 
  10. No porting, polishing, or port matching 


  1. Aluminum intake permitted 
  2. Single carburetor type only 
  3. No porting, polishing, or port matching 
  4. No homemade intakes allowed 


  1. Only Holly four barrel only, no more than 750cfm permitted 
  2. H.P. carburetor permitted. No special production 
  3. No matching, porting, or polishing 
  4. Choke housing may be removed cut must be consistent with top ring of carburetor 
  5. 1” carburetor spacers allowed 
  6. Maximum of two .060 gaskets allowed 


  1. Any type permitted, but must run parallel to ground 
  2. Mufflers required 

Flywheel & Clutch: 

  1. Z-28 flywheel permitted 
  2. Little Clutch permitted 


  1. Factory electronic or HEI only 
  2. Racing Coil permitted 
  3. Add-on boxes and rev-limiters legal 


  1. Bead lock permitted 
  2. 14-inch wheel maximum 
  3. Steel and aluminum wheel allowed 


AR 48 spec

Hoosier HTS 1350 spec

Crate USA 21


NO SIPPING (may cut existing groves with #1 blade ONLY)


  1. 2625lbs 
    1. Head and neck restraint, full containment seat and on-board fire extinguisher are recommended. 


  1. Must be 18” high and on each door 
    1. Must be visible and legible from scoring tower 


  1. Bumper to Bumper $1500 
    1. Complete Engine $1200 
    1. Top End $500 
    1. Complete Suspension $500 
    1. Visual $150 

All Sealed Engine will be teched at Gabriels Engines 

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