427W Ford Stroker Dyno Chart - 568 HP Proformance Unlimited Test Results

This document is a dynamometer test chart produced by Proformance Unlimited Inc. using DYNOmite software, for a test labeled "Johnny J16086 - 427w - 550hp - 2," indicating a 427 cubic inch Windsor-style engine build targeting 550 horsepower. The graph plots torque and horsepower (labeled "#2 Torque" and "#2 Hp") against engine RPM from 3000 to 6000 RPM. The torque curve (blue) stays relatively flat, hovering roughly between 535 and 570 lb-ft across the RPM range, with its highest values around 4400-4650 RPM, then tapering to about 500 near 6000 RPM. The horsepower curve (red) climbs steadily from roughly 315 at 3000 RPM, crossing the torque curve near 5200-5300 RPM, and continues rising to a stated peak power of 568.4 Hp at 5950 RPM. Footnotes indicate the correction method is "Standard" and the engine build notes list AFR CNC Renegade cylinder heads, an Air Gap RPM intake manifold, and MSD ignition. A reader can learn the engine's power and torque characteristics across the operating range, the peak power figure and RPM, and key components used in the build. The chart was uploaded to a 1982 Ford Bronco gallery, presumably documenting the crate/built engine installed in that vehicle.