5.0s Engines -  

 
  • All Engine Combinations must be at 325 Rear Wheel Horsepower with a 10hp allowance
    Please note: All cars are subject to dyno testing. The series may take your car to the dyno or seal your trailer for you to do it. It is up to the series how the car is transported.

     
  • Option 1:  V-8 standard stock production cast iron engine blocks permitted.
    • Max Rear Wheel HP   
      May be adjusted throughout season.
      • 325   with 10- hp allowance.
        • Must be measured at approved DynoJet Facility
          • RAD Auto Machine , Ludlow Ma. is an improved measurement facility.
             
    • Maximum displacement: GM & FORD - 358; DODGE - 368.
      • Original bore and stroke combination must be maintained.
      • Only stock cast or steel crankshaft permitted.
      • Original stroke must be maintained + or -.015"
      • Absolutely no lightening of any part of crankshaft permitted.
        • Minimum weights GM-52 lbs. Ford-351W 52lbs. Mopar-54lbs
      • Rods:
        • Stock rods cast or forged steel.
          • After-market permitted.
          • No billet, stainless steel or aluminum permitted
          • Must be stock configuration to sizes, locations and appearance.
          • Rod length must be stock for particular engine used.
          • No lightening, beam polishing or exterior machine work allowed, except bob weight removal for balancing.
            • When balancing the rods, one of the eight must remain untouched. Any rod bolt permitted. Free floating steel wrist pins permitted.
      • Pistons: Cast or forged 3 steel ring pistons only with all rings in place.
      • Cylinder Heads:
        • Only stock cast iron production or listed manufactures approved.
        • Multi angle valve grinding permitted providing all cuts are centered off centerline of valve guide.
        • Maximum valve size 2.02”
        • The intake and exhaust ports must remain in their original "as cast" configuration.
          • Any sanding, polishing, relieving, grinding, chemical treating, abrasive-blasting alterations to the original form or addition of material to the ports or combustion chambers will be declared illegal.
        • Optional cylinder heads
          • Approved MFG: Dart S/S, GM# 93438648,
          • Engine Quest# CH350I.
          • World Products S/R Torquer.
          • Ford Motorsport M6049-L302.
          • GM Vortec casting numbers 10239906/12558062 only must use 1.94" / 1.50" valve size.
        • Valve Train:
          • Screw in studs, guide plates, lifter valley baffles and rocker polylocks allowed.
          • No stud girdles.
          • Stock type (Stamped magnetic steel) roller-tip rockers permitted at any ratio.
          • Any lift cam permitted.
            • No roller cams.
            • Cam buttons permitted.
          • Stock diameter straight barrel, double valve springs, may be used.
            • Steel retainers only.
          • Only Stock diameter flat tappet, straight barrel lifters (Hydraulic or solid) permitted.
          • Only steel timing chains
            • no gear or belt drive permitted.
          • Vent tubes and oil screens permitted.
          • Only Steel or cast aluminum valve covers permitted.
        • Intake Manifold:
          • Stock two-barrel cast iron intakes permitted with no modifications.
          • All air must go through carburetor and through manifold. 
          • Edlebrock Performer series intakes allowed.
            •  These intakes must remain as manufactured "Stock out of the box".
            • Manifolds may not be altered, including bolt holes.
            • No internal/external painting permitted.
            • Only current designed intakes allowed (part number must be listed on outside
              • Chevrolet 2101-2116
              • Ford 2181-2665-2750,
              • Dodge 2176.
        • Oiling System
          • No remote oil filters.
          • No oil coolers.
          • After-market Steel oil pan is permitted  (excludes crate engines)
            • must keep to stock appearance
            • 1" inch inspection plug for tech,
               
  • Option 2: 602 Chevrolet  Sealed 
    • Apply -75 lb  (deduction to right side weight )
    • May  use 14 lb flywheel
    • Must provide copy of dyno sheet
    • Approved seals:
      • Must have factory seals and any of the following
        • Seal from RAD  Ludlow, Ma.
        • Seal  from Thompson Speedway
        • Seal from Waterford Speedbowl

         

  • Option 3: 603 Chevrolet ; Unsealed 602
    • Unsealed 602
      • Must remain stock components with exceptions made case by case for repairs.
      • Max overbore 0.060
      • Must declare all modifications in advance of running.
        Undeclared modifications found in post race inspection will result in disqualification.
      • Add 20 lbs to the right side
         
    • The 603 crate motor weighs 34 lbs less then the steel headed crate (Source GM)
      Add 20 lbs  per frame rail forward of firewall
      • Will be inspected as per GM 603 Crate Manual.