Speedmaster Engine Crankshaft Main Bearing Cap Stud

Speedmaster Main Bearing Cap Studs: Race-Quality Fasteners for a Bulletproof Bottom End

When you're building a high-performance engine, the rotating assembly is only as strong as the fasteners holding it together. Engine crankshaft main bearing cap studs are among the most critical fasteners in any engine build — they anchor the main bearing caps to the block and keep the crankshaft precisely located under the enormous forces of combustion. Choosing a stud over a bolt is a deliberate upgrade: studs provide more consistent clamping force, resist stretching better over repeated heat cycles, and allow more accurate torque readings during assembly.

Speedmaster has been engineering race-quality engine components since 1979, growing from a small Australian speed shop called Pete's Performance into a globally recognized manufacturer trusted by builders from street cars to Top Fuel dragsters. That same performance DNA flows directly into their main bearing cap stud kits — which are anything but an afterthought.

What Sets Speedmaster Main Bearing Cap Studs Apart

Speedmaster's main bearing cap studs are manufactured from aircraft-quality 8740 high tensile strength chromoly steel, capable of withstanding up to 190,000 PSI. Unlike OEM fasteners that often use lower-grade torque-to-yield hardware, these studs are designed to be reused and re-torqued without degradation — a critical advantage in any engine that sees repeated teardowns or tuning sessions.

The manufacturing process is equally important. Each stud is ground and thread-rolled after heat treatment, which ensures dimensional accuracy and produces a stronger thread form than cut threads. This post-treatment rolling process results in tighter tolerances and more consistent torque readings from stud to stud — exactly the kind of uniformity that engine builders depend on when chasing precise bearing clearances.

Every Speedmaster main stud kit ships as a complete hardware package, including 4130 heat-treated, parallel-ground hardened washers and high-strength 12-point nuts. The 12-point nut design allows access in tighter spaces and provides a stronger grip surface for torque wrenches, reducing the risk of rounding under high clamping loads.

Application Coverage

Speedmaster offers main bearing cap stud kits for some of the most popular performance engine families, including:

• GM LS-Series engines (LS1, LS2, LS6, LS7, LSX, Gen III)
• Small Block Chevy (350, 2-bolt main style)
• Big Block Chevy (454, 4-bolt main style)
• Ford 351W Windsor (2-bolt main style)

This coverage makes Speedmaster a versatile choice whether you're refreshing a classic muscle car, building a weekend bracket racer, or assembling a dedicated strip engine. As one of the rare manufacturers that designs, develops, and produces its own parts in-house, Speedmaster maintains the quality control standards necessary for fasteners that operate at the core of your engine's bottom end.

Explore the full Speedmaster brand catalog for complementary engine components, or browse all engine crankshaft main bearing cap studs to compare options across top manufacturers.