Speedmaster Supercharger Kit

Speedmaster Supercharger Kits: Serious Forced Induction for Street and Strip

When enthusiasts want a dramatic, head-turning power upgrade without rebuilding an engine from the ground up, a supercharger kit is one of the most effective routes available. Speedmaster has carved out a strong reputation in this space by offering complete, thoughtfully engineered supercharger kits that span two distinct forced-induction technologies — the classic Roots-style blower and the high-revving centrifugal design — making them a versatile choice for a wide range of builds.

Complete Blower Kits: The 6-71 Roots-Style Line

Speedmaster's flagship supercharger offering is their Complete Blower Kit product line, built around the iconic 6-71 Roots-style supercharger. These kits are engineered to cover some of the most popular American V8 platforms, including Small Block Chevy (SBC 350), Big Block Chevy (BBC 454/502), GM LS1/LS3, Ford FE (390/428), and Mopar/Chrysler Big Block 440 applications. The breadth of fitment options makes Speedmaster one of the more platform-inclusive choices in the Roots-blower segment.

What sets the Speedmaster 6-71 kits apart at the component level is their construction quality. The supercharger features a polished aluminum case with precision-engineered, double-pinned 3-lobe rotors, timed and clearanced for optimal performance and reliability. Supporting those rotors are heavy-duty front and rear bearing plates, and an intake manifold with a pop-off valve relocated to the back — a thoughtful detail that keeps underhood packaging clean. Performance-wise, Speedmaster's 6-71/8-71 Street Supercharger Kits provide vehicles with 45–55 percent more streetable power.

Equally important is what comes in the box. These kits come with a billet aluminum nose drive assembly, upper and lower drive pulleys, idler pulley with bracket, V-belt accessory drive pulley, Gilmer-style drive belt, gaskets, and hardware — even a polished adapter plate for two 4-barrel carburetors. That level of completeness means builders spend less time sourcing individual pieces and more time turning wrenches.

Speedmaster also gives builders room to tune their setup after installation. The kits are compatible with additional pulley options to fine-tune underdrive or overdrive, allowing versatility for different driving styles or applications. Whether you're dialing in a conservative street tune or chasing maximum boost on the drag strip, the drive-ratio flexibility is a genuine advantage.

The P-2 Centrifugal Supercharger Platform

Beyond the Roots-style lineup, Speedmaster also offers the P-2 Centrifugal Supercharger (PCE157.1002) for builders who prefer a centrifugal design. The P-2 delivers a maximum impeller speed of 52,000 RPM, up to 22 PSI of boost, and a maximum flow of 1,150 CFM, with an isentropic efficiency rating of 78%. Critically, this is a direct drive system that allows no loss of efficiency due to the friction of the gear, and bearings are prepacked, so no oil lines are required — simplifying installation considerably and making it an attractive unit for custom bracket builds.

Why Speedmaster in the Supercharger Kit Category?

Speedmaster approaches forced induction as a complete systems solution rather than selling individual components in isolation. Every Speedmaster 6-71 supercharger is crafted with robust materials and precision engineering to withstand demanding conditions, and the heavy-duty bearing plates and efficient rotor design are built for long-term, consistent performance. Paired with multi-platform fitment — from vintage muscle car big blocks to modern LS swaps — Speedmaster supercharger kits represent a compelling balance of quality hardware, comprehensive packaging, and tuning flexibility for performance builders at every level.