Chevy SBC 350 B-4.000 DH-9.025 4-Bolt Billet Main Bare Aluminum Engine Block

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MPN: 1-286-014-01 UPC: 840136533023
Available Extended Warranty Eligible
US $2,916.70

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If your standard Bowtie block could handle 1000+ HP it would be Speedmaster's AH1 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.

The Speedmaster AH1 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.


Part Number:1-286-014-01
Part Type:Engines, Bare Blocks
Block Material:A-356 Aluminum
Cylinder Bore Diameter:4.000 in.
Bore & Stroke:4.155 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 @ 4.155 in. Bore
Deck Height:9.025 in.
Deck Thickness:0.675 in. Min
Fuel Pump :Electric Only
Fuel Pump Pushrod:n/a
Freeze Plugs:10 x 1-5/8 in. Press In Cup Plugs
Lifter Bores:SBC 0.8427-0.8437 in.
Main Bearing Size: 2.450 in. (SBC 350)
Main Bearing Bore:2.649 in. (SBC 350)
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 350 SBC
Rear Main Seal:Standard 350 SBC - 2pc
Serial No. Location:n/a
Starter:Dual Bolt Pattern
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:110 Lbs @ 4.0 in. Bore
Quantity:Sold individually.
Notes:Check hood clearance before installing.
Calculator:CFM Calculator


Speedmaster AH1 Chevy SBC bare blocks feature:

  • Cast A356-T6 Aerospace Aluminum
  • 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 1000+HP Applications

Brand Information

Speedmaster has become a leader in its field, built on a long term consistency of being a specialist in aftermarket automotive components. The team has shared all the finest moments in the numerous accolades for its people, its products, and its approach. Speedmaster is also one of the rare companies to produce its own products, where majority items are entirely developed and manufactured in its workshops. The ultimate token of precision, Speedmaster is the world’s only major parts manufacturer to equip cars from Standard replacement to Top Fuel Dragsters.

In 1979, the company was founded with Pete’s Performance, which was a small speed workshop. It began by building engines for customers as a hobby, and it has now grown to include selling, assembling, manufacturing and racing high performance engine parts. Over the years, the company has grown into a worldwide high performance powerhouse. Growing from a one-man bricks-and-mortar business; to now a supply chain in which en

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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