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BPP12110346 Small Block Chevy Bare Block, 4.125 in. Bore, 9.025 in. Deck, 350 Billet Mains [2-Piece Rear Main]
InfoVehicle Info Needed
BLUEPRINT ENGINESPART NUMBER: 138-BPP12110346

BPP12110346 Small Block Chevy Bare Block, 4.125 in. Bore, 9.025 in. Deck, 350 Billet Mains [2-Piece Rear Main]

$3,99900
Truck Freight
ShippingShips on 01/11/2027
Lowest PriceLowest Price Guarantee

Chevy Small Block
Bare Engine Block
  • GM Small Block Compatible
  • 9.025 Deck x 4.125 Bore
  • 2-Piece Seal
  • 350 Main
  • SIAM
  • Steel Billet Main Caps
  • Splayed
  • 454 c.i. Maximum

    This GM Small Block Compatible bare block is cast from EN-GJL-250 Iron with a 9.025" +.005" / -.000" deck height and a 4.120" to 4.122" rough bore. It accepts up to a 4.250" bore and Clearanced for 4.000" stroke stroke for as much as 454 cubic inches. The mains use billet steel 4-bolt splayed caps with 7/16-14 Inner / 3/8-16 splayed fasteners and a 2 piece.

    BluePrint Engines BPP12110346 Engine Block Features:

    • Deck height: 9.025" +.005" / -.000"
    • Rough bore: 4.120" to 4.122"
    • Maximum bore: 4.250"
    • Maximum stroke: Clearanced for 4.000" stroke
    • Cylinder wall thickness: .230" Nominal @ Max Bore
    • Main caps: Billet Steel 4-Bolt Splayed
    • Oil system: Priority Main
    • Weight with main caps: 170-190lbs

    BluePrint Engines BPP12110346 Installation Notes:

    • Rear main seal: 2 piece
    • Timing cover: OEM
    • Oil pan: OEM
    • Oil pump: OEM
    • Starter: OEM
    • Cam bearings: Durabond GMP-8
    • Head bolt threads: 7/16-14 UNC
    • Freeze/core plugs: 1-5/8" x 10

      • Build It From the Foundation Up

      BluePrint Engines bare engine blocks give builders a premium starting point for high-performance street, strip, and marine combinations. Designed as serious foundations for popular GM, Ford, and LS-based platforms, these cast-iron blocks are engineered for strength, dimensional stability, and accurate machining so your rotating assembly, valvetrain, and sealing surfaces come together with confidence. With BluePrint’s modern manufacturing and in-house machining capabilities supporting consistent bore geometry and critical tolerances, you get a block that’s ready for a custom build path, from fresh stock-style replacements to large-displacement stroker projects.

    Part TypeEngine Block
    Product LineBlueprint Engines Bare Engine Blocks
    BrandBLUEPRINT ENGINES
    Package Height22.5
    Package Width26.0
    Package Length26.0
    Weight190.0 PG
    Part CategoryPerformance Parts
    QuantitySold Individually
    Part FitmentSemi Universal
    Deck Height9.025 in. +.005 in. / -.000 in.
    Engine Make/SizeChevy Small Block
    Vendor Part NumberBPP12110346
    Package Qty1
    Package TypeEA
    Some parts are not legal for use in California or other states with similar laws / regulations
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