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Cast Iron S/B Chev Engine Block, 4.000" Bore 9.025" Deck Height, 350 Mains
  • Cast Iron S/B Chev Engine Block, 4.000" Bore 9.025" Deck Height, 350 Mains
  • Cast Iron S/B Chev Engine Block, 4.000" Bore 9.025" Deck Height, 350 Mains
Cast Iron S/B Chev Engine Block, 4.000" Bore 9.025" Deck Height, 350 Mains

Cast Iron S/B Chev Engine Block, 4.000" Bore 9.025" Deck Height, 350 Mains

$2,722.90

SKU: AF96-1000

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Elevate a Chevy small-block build with Aeroflow Performance’s Cast Iron Small-Block Chevy Engine Block. Crafted from premium Class 32B iron, this brand-new, heavy-duty block is designed to handle street performance and light competition applications. It blends rugged strength with practical compatibility, delivering a foundation you can trust for demanding builds.

Key features include siamese cylinder bores and four-bolt billet steel main caps with a deep stepped register, delivering exceptional strength and stability under higher cylinder pressures. The priority main oiling system directs lubrication to the mains first, boosting reliability during spirited driving and competitive use. An extra-thick deck height improves head gasket seal and accommodates standard off-the-shelf components while maintaining robust performance.

Key specifications

  • Chevy Small Block (S/B Chev) cast iron engine block
  • Bore: 4.000" (cylinder bore diameter)
  • Deck height: 9.025"
  • 350 mains, 4-bolt billet steel splayed main caps with deep stepped register
  • Cylinder bore diameter: 4.000"
  • Max bore & stroke: 4.185" × 4.000"
  • Cam journal OD: STD 1.869"
  • Cam plug: 2.375" press-in cup
  • Cam location: STD
  • Cylinder wall thickness:.275" (min at 4.185" bore)
  • Deck thickness:.675"
  • Min fuel pump: STD mechanical provision
  • Fuel pump pushrod: STD
  • Freeze plugs: 10 x 1-5/8" press-in
  • Lifter bores:.842" diameter
  • Main bearing size: 2.450" (350)
  • Main bearing bore: 2.649" (350)
  • Main cap bolts: 7/16" & 3/8" on caps 1 & 5, 7/16" on caps 2–4 (splayed)
  • Main caps: Billet steel, 3 center caps
  • Main cap register: Deep stepped (no dowels required)
  • Oil system: Main priority oiling (can use dry sump)
  • Oil pump shaft:.481" standard (350)
  • Oil filter: STD, uses 2-bolt adapter
  • Oil pan: STD 350
  • Rear main seal: STD 350 2-piece
  • Serial number location: Left front & main caps
  • Starter: STD stud holes, head: blind holes
  • Timing chain/gears: STD
  • Timing cover: STD
  • Weight: 92 kg (205 lbs)

Why this block fits your build

  • Heavy-duty cast iron foundation: Reliable, durable performance for street-driven and light-competition scenarios.
  • Siamese bores with billet splayed caps: Provides enhanced resistance to cap walk under high-pressure operation.
  • Deep deck and.675" deck thickness: Promotes a solid, dependable head gasket seal and compatibility with off-the-shelf components.
  • Priority mains lubrication: Helps maintain bearing life when pushing higher outputs.
  • Semi-finished bare block: Reduces machining time while acknowledging that final fitment requires professional finish machining and precise measurement for your components.

Machining, assembly, and installation

This block must be professionally finished to achieve optimal performance. Because tolerances vary and many parameters require tailored machining, assembly by an experienced, professional engine builder is strongly recommended.

With its classic cast-iron backbone, this block provides a cost-effective yet capable platform for Chevy small-block enthusiasts who demand reliability without sacrificing performance. Whether you’re building a street-ready cruiser or dialing in a light-competition setup, this block offers a robust foundation designed to grow with your components.

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