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19434240 Mark IV/Gen VI Bare 502 ci. Engine Block
InfoVehicle Info Needed
CHEVROLET PERFORMANCEPART NUMBER: 809-19434240

19434240 Mark IV/Gen VI Bare 502 ci. Engine Block

$4,09842
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ShippingShips on Nov 10, 2026
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Performance Small Block Bare Block
Mark IV/Gen VI Bare Engine Block
  • Block Material: Cast-Iron
  • Bore: 4.470 in.
  • Deck Height: 9.800 in.
  • Siamese Cylinders
  • 4-Bolt Main Caps
  • Compatible w/Mark IV or Gen VI Heads
  • Uses Roller or Flat Tappet Camshaft
  • 1-Piece Rear Main

    Chevrolet Performance 19434240:

    • New Design Casting Taking the Best of Both MarkIV and GenVI Designs
    • Production Type Cast-Iron 4-Bolt
    • Block Improved Main Bearing Bulkheads with Bowtie Block-Style Bulkhead
    • Clearanced for Larger Strokes
    • 4.470 Inch Finished Bore
    • 4.500 Inch Max Bore (Siamese)
    • Fuel Pump Pad Added/Machined
    • Water Jackets for Either MarkIV or GenVI Heads
    • Revised Oiling to Allow Bigger Cam Bearings and Lift
    • Bolt Boss is Machined, Adding Near Distributor Hole Like 8.1L
    • Can be Drilled for Use with 10-Bolt Front Cover
    • Auxiliary Oil Pressure Line Added to Front of Block
    • Racing Style Oil Filter Cast Feature with Added Oil Pressure Port
    • Two Bosses Added for Manual Transmission Clutch Pivot
    • Additional Materiel Added Around Lifter Bosse

    Emissions Note:

    This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

    CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART

      • A Stout Engine Foundation

      Chevrolet Performance bare blocks are the right choice for street car rebuilds or to start your own mild engine project. They come in the same dimensions that you are already familiar with and are produced to the high level of quality that Chevrolet is famous for. These are brand new castings that are machined to exact tolerances and delivered to you at an affordable price. These blocks are designed for street engines that demand good strength and a high level of durability! 

    Part TypeEngine Block
    Product LineChevrolet Performance Bare Engine Blocks
    BrandCHEVROLET PERFORMANCE
    Package Height28.0
    Package Width31.0
    Package Length35.5
    Weight157.0 PG
    Part CategoryPerformance Parts
    Engine Block StyleStock/OEM standard Deck
    Engine Block MaterialCast iron
    Engine Block Weight (Lbs.)269
    QuantitySold individually
    Raised Cam LocationNo
    Freeze Plugs IncludedYes
    Main Bolt Style4-bolt
    Main Bearings IncludedNo
    Rear Main Seal Style1-piece
    Main Caps IncludedYes
    Finished Cylinder BoresYes
    Cylinder Bore Diameter4.470 in.
    Cam Bearings IncludedYes
    Part FitmentSemi Universal
    Main Cap Fasteners IncludedYes
    Vendor Part Number19434240
    Package Qty1
    Package TypeEA
    Some parts are not legal for use in California or other states with similar laws / regulations
    p65 warning