Newsroom

The Speedmaster El Rayo Ignition Combo Kit pairs an ignition amplifier with matched components for the small block Chevy, delivering a direct upgrade path for builders seeking consistent spark energy and improved combustion efficiency.

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.

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.

Starting with a recycled two-barrel 350 producing 246 hp, this dyno test walks through three distinct power phases, each built on deliberate component choices. The final combination reached 543 hp at 6,900 rpm from 355 cubic inches.

Starting at 388 hp, a Speedmaster 383 stroker gained nearly 100 horsepower through three targeted upgrades: CNC-ported heads, a more aggressive cam, and a single-plane intake. Each swap shifted the torque curve higher in the rev range, illustrating the direct relationship between component selection and where an engine makes its power.

This original Cobra build features a Speedmaster down draft manifold, combining classic American performance heritage with precision-engineered induction technology.

We pulled a running small block from a wrecking yard for under $300, baselined it at 312 hp on the dyno, and then upgraded the heads and cam to reach 420 hp and 415 lb-ft of torque - all on the original short block.

The factory-rated 365-hp L76 327 and the truck-duty 5.3L LM7 are separated by decades of engineering evolution but share nearly identical displacement. We ran both on the dyno in stock and modified configurations to see where the numbers actually land.

Speedmaster and Nelson Competition Products are collaborating on Project X360 - a 427 small block Chevy engine build for a 1969 Camaro. The project targets 600 to 650 horsepower on pump gas, with the completed car set to appear at SEMA.

This installation guide covers the essential steps involved in fitting a Speedmaster stroker kit, from initial teardown through final assembly. Watch the full walkthrough from Sydney Speed Supplies.

This video covers a Ford 302 to 347 cubic inch Windsor stroker motor assembled with Speedmaster components. Watch the full build overview from Sydney Speed Supplies.

Watch Sydney Speed Supplies run in a Speedmaster Chevy 350 to 383 stroker crate motor. This video covers the initial break-in process for a freshly assembled engine.

A Speedmaster Chevy 383 stroker crate motor completes its initial run-in at Sydney Speed Supplies, demonstrating what a complete, engineered rotating assembly delivers out of the crate.

Watch Sydney Speed Supplies run a Speedmaster 434 Windsor crate motor on the engine dyno. This video captures the dyno session and shows the stroker combination in action.

Watch Sydney Speed Supplies run in a blown 383 Chevy stroker motor built with Speedmaster components. This video captures the initial break-in of a supercharged small block Chevy combination.

This video features a Speedmaster 383 blown small block Chevy motor built by Sydney Speed Supplies. Watch the full showcase of this supercharged stroker combination.