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Made in USA
SBC Motown Iron Race Block Mains: 400
InfoVehicle Info Needed
WORLD PRODUCTSPART NUMBER: 955-084130

SBC Motown Iron Race Block Mains: 400

$4,54946
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ShippingShips on 11/10/2026
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4.120 in. Bore
Billet Mains
Motown Cast Iron Engine Block
  • Small Block Chevy
  • 400 Mains
  • 4.120 in. Bore
  • Billet Splayed 4-Bolt Main Caps

    Features

    • Material: Cast iron
    • Deck Height: 9.025 in. (standard Chevy)
    • Deck Thickness: .600 in. minimum
    • Cam Bearings: Standard Chevy
    • Camshaft Location: Stock
    • Lifter Bores: Indexed (stock .8437 in. bore)
    • Bore: 4.120 in. (hone to 4.125 in.)
    • Maximum Bore: 4.200 in.
    • Cylinder Wall Thickness: .250 in. @ 4.200 in. bore
    • Lubrication: Priority main oiling system
    • Filtration: Integral mount for spin-on filter
    • Oil Pan Rails: Solid stock width (can be clearanced for Strokers)
    • Crank Clearance: 4.000 in. stroke (with H-Beam steel rods)
    • Main Caps: Billet 4-bolt (7/16 in.) with dowels to handle extreme pressures
    • Fuel Pump: OE mount
    • Starter: OE mount
    • Motor Mounts: Front and side
    • Cylinder Head Holes: Blind tapped to prevent leaks
    • Cam location is raised .134 in. over the stock Chevy location
    • Machined with Big Block Chevy cam journal
    • Weight: Approximately 200 lbs.

    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

      • Small Block Chevy Replacement Blocks with Major Muscle

      World Products Motown II Small Block Chevy Cast Iron Blocks are entirely manufactured to QS-9000 specs using only two fixturing operations (no tolerance stacking like factory blocks made on an assembly line). Compared to OE models, World’s Motown II engine blocks contain thicker cylinder walls, and the expanded water jackets help improve cooling. Each engine block includes one-inch thicker bulkheads (to provide ample support of the front and rear mains), bosses for front-feed oil systems, and rear dry-sump scavenging. Solid pan rails (standard width design) ensure proper sealing, and stock-type oil pans can be used.

    Part TypeEngine Block
    Product LineWorld Products Small Block Chevy Motown II Cast Iron Blocks
    BrandWORLD PRODUCTS
    Package Height16.0
    Package Width22.0
    Package Length25.0
    Weight200.0 PG
    Part CategoryPerformance Parts
    Main Journal Type400 mains
    Engine Block StyleStock/OEM standard deck
    Engine Block MaterialCast iron
    Cylinder Bore As Shipped4.115 in (104.521 mm)
    Engine Block Weight (Lbs.)195
    QuantitySold individually
    Raised Cam LocationNo
    Freeze Plugs IncludedNo
    Main Bolt Style4-bolt
    Deck Height9.025 in (229.235 mm)
    Main Bearings IncludedNo
    Main Cap MaterialSteel
    Rear Main Seal Style2-piece
    Main Caps IncludedYes
    Finished Cylinder BoresNo
    Cylinder Bore Diameter4.125 in (104.775 mm)
    Cam Bearings IncludedNo
    Part FitmentSemi Universal
    Main Cap Fasteners IncludedYes
    Vendor Part Number084130
    Package Qty1
    Package TypeEA
    Some parts are not legal for use in California or other states with similar laws / regulations
    p65 warning