Description

Overview

The BluePrint Engines Bare Block 454 c.i. SBC 2PC SIAM 9.025 x 4.000 350 Main Cast MC is engineered to serve as the foundation for high-performance small-block Chevrolet engine builds. Engine blocks are the core structural component of any internal combustion engine, housing the cylinders, crankshaft, and other critical rotating components.

Performance engine builders often choose aftermarket engine blocks when constructing high-power engines because they offer stronger materials and improved durability compared to many factory blocks. These blocks are designed to handle increased cylinder pressure, higher horsepower levels, and demanding performance conditions.

BluePrint Engines has developed a reputation in the automotive performance industry for producing high-quality engine components designed for reliability and performance applications.

The BluePrint Engines Bare Block 454 c.i. SBC 2PC SIAM 9.025 x 4.000 350 Main Cast MC provides a durable engine block platform suitable for custom engine builds and high-performance applications.

Applications and Engine Builds

The BluePrint Engines Bare Block 454 c.i. SBC 2PC SIAM 9.025 x 4.000 350 Main Cast MC is designed for builders creating custom small-block Chevrolet engines.

Typical applications include:

• high-performance street engines
• drag racing engines
• custom engine builds
• restoration projects requiring upgraded engine blocks
• performance vehicles with high horsepower requirements

Because engine compatibility depends on the full engine build configuration, confirming component compatibility with the block specifications is recommended before assembly.

Build Quality and Engineering

The BluePrint Engines Bare Block 454 c.i. SBC 2PC SIAM 9.025 x 4.000 350 Main Cast MC is constructed using durable cast materials designed to support demanding engine performance.

Important structural features include:

• Siamese cylinder walls for increased block strength
• 2-piece rear main seal design
• 350 main journal configuration
• reinforced block casting for durability
• precision-machined cylinder bores

Siamese cylinder walls provide additional strength by eliminating coolant passages between cylinders, which helps improve block rigidity. This design allows the block to handle higher cylinder pressures in performance engine applications.

The block is engineered to support high-performance engine builds requiring a strong and stable engine foundation.

Why This Engine Block Is a Reliable Choice

The BluePrint Engines Bare Block 454 c.i. SBC 2PC SIAM 9.025 x 4.000 350 Main Cast MC is widely selected by engine builders because a high-quality engine block is critical for long-term engine durability and performance.

Performance engine builds often require stronger components capable of supporting increased horsepower and torque.

Engine builders often choose this block because it provides:

• strong structural engine foundation
• compatibility with small-block Chevrolet components
• improved durability for high-performance engines
• dependable block strength for demanding applications

Using a durable engine block helps ensure reliable engine operation under high-performance conditions.

Who This Engine Block Is Designed For

The BluePrint Engines Bare Block 454 c.i. SBC 2PC SIAM 9.025 x 4.000 350 Main Cast MC is designed for buyers building custom small-block Chevrolet engines.

Typical buyers include:

• professional engine builders
• performance vehicle builders
• racing teams assembling high-performance engines
• automotive machine shops
• enthusiasts building custom engines

This block is particularly suitable for builders who require a strong engine foundation capable of supporting high horsepower applications.

Engine Block Specifications

The BluePrint Engines Bare Block 454 c.i. SBC 2PC SIAM 9.025 x 4.000 350 Main Cast MC is engineered to support high-performance small-block Chevrolet engine builds.

Key specifications include:

• Engine Type: Small-block Chevrolet (SBC)
• Displacement Capability: 454 cubic inches
• Rear Main Seal: 2-piece rear main seal
• Cylinder Wall Design: Siamese cylinder walls
• Deck Height: 9.025 inches
• Bore Size: 4.000 inches
• Main Journal Size: 350 main configuration
• Material: Cast engine block

These specifications provide engine builders with a strong and durable foundation for custom engine builds.

Ordering and Support

Ordering the BluePrint Engines Bare Block 454 c.i. SBC 2PC SIAM 9.025 x 4.000 350 Main Cast MC provides a reliable starting point for high-performance engine builds.

Before purchasing an engine block, it is recommended to verify:

• crankshaft compatibility
• piston and rod configuration
• cylinder bore requirements
• overall engine build specifications

Professional engine suppliers and machine shops often assist builders in selecting compatible components for their engine build.

With proper machining, assembly, and maintenance, a high-quality engine block can support dependable engine performance for many years.

Frequently Asked Questions

What is a bare engine block?

A bare engine block is the main structural component of an engine that houses the cylinders and crankshaft but does not include internal engine components.

What does SBC mean?

SBC stands for Small Block Chevrolet, a popular engine platform widely used in performance vehicles and racing engines.

What are Siamese cylinder walls?

Siamese cylinder walls are cylinders that share a common wall without coolant passages between them, increasing block strength and rigidity.

Why do performance engines use aftermarket blocks?

Aftermarket blocks are often stronger than factory blocks and are designed to support higher horsepower and racing applications.

What type of engine can be built with this block?

This block is designed for high-performance small-block Chevrolet engine builds capable of reaching 454 cubic inches.

If you’re aiming to build a stout, reliable small block without breaking into exotic territory, this SBC-compatible block is the perfect foundation. Engineered to comfortably support combinations all the way up to 454 cubic inches, it delivers the strength, precision, and durability builders demand. With thick cylinder walls, a rigid casting, and smart machining allowances, this block is built to handle everything from a crisp street cruiser to a hard-hitting weekend track car.
Cylinder Bore (Rough):
3.989″ to 3.991″
Cylinder Bore (Max):
4.250″
Cam Bearings:
Durabond GMP-8
Cam Bearing Bore ID:
2.000″+/- .001″
Camshaft Position:
OEM
Cam Drive / Timing Set:
OEM equivalent
Cam Retaining Plate:
OEM
Cubic Inch (Max):
454
Cylinder Wall Thickness:
.230″ Nominal @ Max Bore
Water Jacket Style:
Siamese
Cylinder Skirt Length:
5.800″ Nominal
Deck Height:
9.025″ +.005″ / -.000″
Deck Thickness:
.600″ Nominal
Freeze / Core Plugs:
1-5/8″ x 10
Head Bolt / Stud Threads:
7/16-14 UNC
Lifter Bores:
.8437″ +/- .0003″
Lifter Retainer (If not using tie car lifters):
OEM W/Roller Provisions
Main Bearing Bore (Line Honed):
350 Main – 2.6402″ – 2.6410″
Main Bearing Caps:
Cast Iron 4-Bolt Splayed
Main Cap Bolts:
7/16-14 Inner / 3/8-16 Splayed
Main Fastener Tensile Strength:
180,000 to 210,000 PSI
P1 Main Stud Kit P/N:
TBD
ARP Main Stud Kit P/N:
TBD
Material (Block):
EN-GJL-250 Iron
Oil System:
Priority Main
Oil Pump:
OEM
Oil Filter:
OEM
Oil Pan:
OEM
Rear Main Seal:
2 piece
Starter:
OEM
Stroke (Max):
Cast in clearance 3.875″
Timing Cover:
OEM
Approx. Weight with Main Caps:
170-190lbs
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