Chevy SBC 400 B-4.125 M-400 DH-9.025 4-Bolt Billet Main Bare Iron Engine Block

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MPN: 1-286-011-01 UPC: 840136502500
Available Extended Warranty Eligible
US $1,788.75 US $2,385.00
You Save US $596.25 (25%)Single Points Earn 1789 Points Info (outlined)

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Item Condition: Brand NewInfo (outlined)

  • Warranty:

    12-Month Limited Worldwide Warranty


If your standard Bowtie block could handle 1500+ HP it would be Speedmaster's H1 engine block. Design from the ground up based upon your favourite bowtie block with the ability to handle naturally aspirated, supercharged, turbocharged and nitrous applications.


Part Number:1-286-011-01
Part Type:Engines, Bare Blocks
Product Line:H1
Cylinder Bore Diameter:4.125 in.
Bore & Stroke:4.185 in. x 4.000 in. Max Recommended
Cam Journal OD:Standard SBC - 1.869
Cam Plug:2.375 in. Dia. Cup Plug
Cylinder Wall Thickness:0.275 in. min @ 4.185 in. Bore
Deck Height:9.025 in.
Deck Thickness:0.675 in. Min
Fuel Pump :Standard Mechanical Provision
Fuel Pump Pushrod:Standard Length
Freeze Plugs:10 x 1-5/8 in. Press In Cup Plugs
Lifter Bores:SBC 0.8427-0.8437 in.
Main Bearing Size: 2.650 in. (SBC 400)
Main Bearing Bore:2.849 in. (SBC 400)
Main Cap Bolts:#1 7/16 in. (2) 3/8 in. (2)
#2, 3, 4 7/16 (2) Splayed (2)
#5 7/16 in. (2) 3/8 in. (2)
Main Cap Press:0.005 in.
Main Caps:All 5 Billet Steel. 3 Center Caps Splayed
Main Cap Register:Deep Stepped Register (No Need for Dowels)
Oil System:Wet Sump - Main Priority Oiling (Can Use Dry Sump)
Oil Pump Shaft:350 0.481 in. OD - Standard
Oil Filter:SBC, Uses 2 Bolt Adapter
Oil Pan:Standard SBC
Rear Main Seal:400 Main FelPro# 2909
Serial No. Location:Laft Front & Main Caps
Starter:Standard SBC
Stud Holes, Head:Blind Holes
Timing Chain/Gears:Standard SBC Components
Timing Cover:Standard Cam Location SBC
Torque Specs:1 - 5 7/16 in. Bolts 65 ft. lbs.
1 & 5 3/8 in. Bolts - 35 ft. lbs.
Weight:205 Lbs @ 4.0 in. Bore
Quantity:Sold individually.
Notes:Cam Bearings not Included, Replaces Dart 31182211
Calculator:CFM Calculator


The Speedmaster H1 is the perfect starting point for a powerful and reliable engine build suited for the street or race track. Precision pre-machining is the perfect starting point for a powerful and reliable engine eliminating time and expense of blueprinting a stock block or ''semi-finished'' factory casting. Best of all can be used with standard off the shelf small block components.

Speedmaster H1 Chevy SBC bare blocks feature: 

  • Cast from premium high-strength Class 32B iron
  • Standard deck height allows the use of off the shelf parts
  • Uses standard small block Camshaft, Timing Chain, Oil pump, Oil filter, Motor Mounts.
  • Priority main oiling system directs oil to main bearings
  • Blind tapped head bolt holes prevent water leaks
  • Extra thick decks ensure reliable head gasket seal
  • Billet steel 4-bolt main caps (splayed for extra strength)
  • Front and rear external oil feed, crossover and restrictor provision
  • Simplified plumbing for external pumps
  • Used in 1500+HP Applications

Brand Information

Prop 65 Warning

This product may contain chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.

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best block for the money

best block i have ever used 8000 rpm all day well worth the money ordered and shipped fast