1991 Mitsubishi Eclipse Cylinder Block Components

What Are Cylinder Block Components?

The cylinder block is the structural core of any internal combustion engine — every major system, from the oiling circuit to the valvetrain, anchors itself to this central foundation. Cylinder block components encompass the full range of parts that make up, surround, and secure this foundation: cylinder heads, oil pans, engine mounts, harmonic balancers, head bolt sets, pistons, rings, freeze plugs, and much more. Whether you are rebuilding a stock daily driver, refreshing a classic muscle car, or constructing a high-horsepower race engine from scratch, the quality of these components directly determines how long and how well your engine performs.

Why These Parts Matter

Unlike wear items such as brake pads or filters, cylinder block components are often the last line of defense between a running engine and catastrophic failure. A compromised engine cylinder head can lead to coolant contamination, loss of compression, and warped mating surfaces. A leaking engine oil pan starves the bottom end of lubrication. Worn or improperly torqued engine cylinder head bolt sets allow head gaskets to fail under pressure. Even the engine harmonic balancer plays a critical role — dampening crankshaft torsional vibration that, left unchecked, can crack the crank itself. And a fatigued or incorrect engine mount allows powertrain movement that stresses exhaust connections, transmission linkages, and CV axles.

In short, this category covers the parts that hold everything together — literally and figuratively. Cutting corners here is rarely worth it.

Top Brands in Cylinder Block Components

ARP (Automotive Racing Products) is widely regarded as the standard-bearer for engine fasteners. Since 1968, Automotive Racing Products has been engineering and perfecting bolts, studs, nuts, and other fasteners for engines, cylinder heads, headers, wheels, transmissions, and more. When racing professionals in NHRA, IHRA, NASCAR, and Formula 1 competition need bullet-proof fasteners for their high-performance machines, they turn to ARP. Their head bolt kits and main stud kits are considered essential hardware for any serious engine build.

Speedmaster offers one of the broadest lineups of cylinder block components in the performance aftermarket, from bare engine blocks to cylinder heads and complete rotating assemblies. Speedmaster re-engineered their blocks with extra-thick cylinder walls and decks, super-strong webs, and billet steel 4-bolt main caps to eliminate common factory flaws. Their catalog spans Chevrolet, Ford, and Mopar applications, making them a go-to resource for engine builders across platforms.

Dorman is a trusted name in OE-replacement and hard-to-find engine hardware, supplying components such as oil pans, engine mounts, and block hardware across a massive range of domestic and import vehicles. Dorman's strength lies in its extensive coverage — making it the practical choice when restoring a vehicle to factory-correct operation.

Hastings has been manufacturing piston rings in the United States for well over a century, earning a reputation for consistent dimensional accuracy and durable ring materials. Builders who demand tight tolerances and reliable ring seal — whether for street performance or professional engine rebuilds — frequently specify Hastings rings.

Wiseco Pistons specializes in forged pistons engineered for demanding applications. Wiseco pistons are forged from high-strength aluminum alloys, offering superior fatigue resistance compared to cast alternatives, and are available in an extensive range of bore sizes and compression ratios to suit everything from turbocharged street engines to all-out race builds.

Key Considerations When Shopping Cylinder Block Components

• Application fit: Always confirm bore size, deck height, and engine family before ordering block-level components. Small errors here can mean expensive returns or machining costs.
• OEM vs. performance: Stock replacements restore original function; performance-oriented parts like forged pistons or ARP fasteners can raise the ceiling on power and durability.
• Material: Cast iron offers cost efficiency and thermal mass; aluminum reduces weight but may require different torque specs and gasket materials.
• Complete kits vs. individual parts: Many builders find that purchasing head bolt sets, gasket kits, and ring sets together ensures proper compatibility and simplifies the build process.