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Part Three of the Project Blackbird build thread documents continued progress on the custom Daytona Coupe, with the car moving deeper into assembly and component integration.

Project Blackbird Part Two picks up where the first installment left off, documenting the next stage of structural and body work on this custom Daytona Coupe build.

Project Blackbird begins. Part one of this build thread documents the early stages of a custom Daytona Coupe project, built with Speedmaster components from the ground up.

A 347-stroker small-block Ford fitted with Speedmaster connecting rods and a Zex Perimeter Plate nitrous system picked up 171 horsepower on the dyno - demonstrating what a well-matched nitrous setup makes possible on a purpose-built engine.

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.

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.

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.

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.

Spirit Cars selected a Speedmaster Aluminum 9-inch rear end as the foundation for the Black Knight hot rod build, pairing modern engineering with a deliberate mechanical aesthetic.

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 Side Draft EFI System for the Chevy LS3 combines individual throttle body design with electronic fuel injection, producing 546 HP and 520 ft-lbs of torque. The system earned a 2015 SEMA Award for its engineering and design.

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.

A Gen VI 454 pulled from a wrecking yard produced 369 hp in baseline trim. After installing Edelbrock RPM 454-O aluminum heads, a Performer RPM Air Gap intake, and a COMP XR271HR12 hydraulic roller cam, output climbed to 481 hp and 527 lb-ft of torque.

A 383 cubic-inch LS stroker built around a 4.8L iron block produced 527 hp naturally aspirated. After installing the Speedmaster 6-71 supercharger kit with a dual-quad carburetor setup at 7.3 psi, output reached 753 hp and 625 lb-ft of torque.

A full-length 2.5-inch Hooker Blackheart exhaust system was tested against open headers on a 383 LS stroker to measure the actual power cost of running a street-legal exhaust. The results showed a difference of just 9 hp at peak, with the street system delivering 542 hp at 6,000 rpm.

A stock LQ4 6.0L truck engine was upgraded with LQ9 flat-top pistons, a COMP 54-454-11 cam, Stage 2 ported 317 heads from Total Engine Airflow, and a FAST LSXR intake. The result: 549 hp at 6,700 rpm and 481 lb-ft of torque at 4,900 rpm.