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A 496ci big-block stroker built to perform across three configurations - naturally aspirated, nitrous-injected, and supercharged - reached 1,144 hp on just 11 psi of boost from a ProCharger F-1A-94, with capacity still in reserve.

In the fourth instalment of the 5.0L Fistfight series, both the Ford 302 and Chevy 305 receive TorqStorm centrifugal superchargers. The Ford produces 619 hp, but the Chevy's stronger block may tell a different story long-term.

A back-to-back dyno test on a modified 5.7L Hemi crate motor shows the Speedmaster downdraft individual-runner system producing 512 hp and 452 lb-ft - a 29 hp and 49 lb-ft improvement over the factory single-plane intake, with gains across the full curve.

Speedmaster's 540-inch Chevy big block project, producing 939 horsepower with boost and nitrous, was featured in the August 2017 edition of Performance Racing Industry Magazine alongside coverage of power adders, header designs, and technology previewed for PRI 2017.

A controlled dyno comparison of a cam-only LS3 and a built 427 LSX tests a foundational boost principle: the stronger the naturally aspirated baseline, the more power you make under pressure.

A back-to-back dyno test on a twin-turbo 540-inch big block from Blue Print Engines measures the real-world power difference between ambient dyno water and ice water flowing through an air-to-water intercooler - 28 hp and 48 lb-ft at 10.4 psi.

Richard Holdener puts the Speedmaster Eliminator dual-plane intake head-to-head against a Trick Flow Specialties Street Heat EFI system on a modified 5.0L Ford, with dyno results revealing where each configuration delivers its advantage.

Using a junkyard 5.0L Ford topped with Trick Flow 11R heads and a Speedmaster Eliminator dual-plane intake, Richard Holdener tested 1-inch open and 4-hole carb spacers from Wilson Manifolds - measuring where each design adds power and where it trades torque.

A back-to-back dyno test on a 350 Chevy Street Stock motor demonstrates that average power across the usable rpm range matters more than peak numbers, and that properly sized 1 5/8-inch Speedmaster headers deliver measurable torque gains from 3,000 to 5,400 rpm.

Richard Holdener puts the BluePrint Engines 540 big-block Chevy through a progressive boost test using a Speedmaster 8-71 supercharger kit, reaching 939 hp and 866 lb-ft of torque at 11.1 psi.

What actually happens when oil pressure drops to zero and you keep driving? Richard Holdener and Chad Reynolds put it to the test on The Wheel of Death, combining controlled destruction with real failure analysis.

Running a 331 Ford stroker to 761 hp on a factory 5.0L block revealed a critical lesson: boost is a multiplier, not a solution. Building normally aspirated power first delivers more output at lower, safer boost levels.

On a 331 Ford stroker equipped with Speedmaster forged internals and a COMP cam, swapping from stock E7TE iron heads to Edelbrock Performer RPM aluminum heads delivered an 85 hp gain. The results reinforce why the order of modifications matters.

On a mild 5.7L Gen III Hemi, the Speedmaster Stack Attack individual-runner intake system produced 461 hp and 412 lb-ft of torque, outperforming a Mopar Performance single-plane intake by 35 hp with gains throughout the entire rev range.

A modified 4.8L LS equipped with Speedmaster rods, JE forged pistons, and a Vortech Ti supercharger produced 799 hp at 15.8 psi, nearly doubling the 438 hp naturally aspirated baseline. The results demonstrate the value of building NA power before adding boost.

The Speedmaster downdraft system for small block Chevy produced 401 horsepower on the dyno, tested by Richard Holdener. The video covers the full dyno session and results.

A complete top end kit for the Big Block Chevy, tested on the dyno by Richard Holdener. The Speedmaster kit delivers over 100 horsepower in a single bolt-on upgrade.

Speedmaster puts its blower components through a side-by-side shootout on a Small Block Chevy. The test measures real output differences between supercharger setups on the same engine.