Speedmaster Supercharger

Speedmaster Superchargers: Roots-Style Power for Street and Strip

Few upgrades transform an engine's character as dramatically as a supercharger, and Speedmaster has built its reputation in this space by delivering complete, well-engineered blower solutions for a wide range of popular engine families. Whether you're building a classic big-block Chevy, a modern LS-platform powerplant, or a Ford application, Speedmaster's supercharger lineup offers purpose-built kits designed to maximize forced-induction performance without requiring major engine surgery.

The 6-71 Roots-Style Supercharger Kits

Speedmaster's flagship supercharger offering is their 6-71 Roots-style Complete Blower Kit series, spanning a broad range of engine applications. These kits cover popular platforms including Small Block Chevy, LS1/LS2/LS6 Cathedral Port, LS3, and Ford engines — making Speedmaster one of the more versatile options in the roots-style segment.

What sets these kits apart from bare-unit purchases is the sheer completeness of the package. Speedmaster's 6-71 supercharger kits feature a polished case with a double-pinned rotor assembly that is timed and clearanced at the factory, paired with heavy-duty front and rear bearing plates. The intake manifold includes a pop-off valve relocated to the rear — a thoughtful engineering detail that improves underhood packaging. Each kit also ships with a billet aluminum nose drive assembly, upper and lower drive pulleys, an idler pulley with bracket, a V-belt accessory drive pulley, a Gilmer-style drive belt, a polished adapter plate for dual 4-barrel carburetors, and all necessary gaskets and hardware.

Power gains from Speedmaster's 6-71 kits can reach up to 45–55% more horsepower over a naturally aspirated baseline — a substantial jump that is achievable without rebuilding the short block. Pulley teeth counts of 50/55 come standard, and Speedmaster also offers additional pulleys separately so builders can fine-tune underdrive ratios to suit their specific power and street-drivability goals.

Centrifugal Supercharger Option

Beyond the classic roots-style blower, Speedmaster also offers the P-2 Centrifugal Supercharger Head Unit (PCE157.1002) for builders who prefer a different boost delivery curve. The P-2 is rated to a maximum impeller speed of 52,000 RPM and a maximum flow of 1,150 CFM, with an isentropic efficiency of 78% — performance figures that put it squarely in serious street and track territory. Operating at an ideal 6–8 PSI of boost, the unit features prepacked bearings that require no external oil lines, simplifying installation. A curved discharge style and direct impeller drive round out a design focused on clean, efficient airflow.

Built on Decades of Performance Engineering

Speedmaster was founded in 1979 and has grown into a global manufacturer with over 25,000 components and facilities across three continents. Every supercharger product carries the brand's "Track Proven" philosophy — meaning each design must prove itself under real-world road, race, and recreational conditions before it reaches the consumer. That standard of durability is evident in the robust materials and precision engineering that go into every 6-71 blower and centrifugal unit they produce.

For builders ready to add serious forced induction to their project, explore the full range of Speedmaster supercharger kits available, or browse the complete Speedmaster catalog for complementary engine components. You can also view all supercharger options across top brands to compare styles and applications.