* Higher Compression Ratio: The HO engine usually had a higher compression ratio than the standard 5.0L. This allows for more efficient combustion and thus more power.
* Improved Camshaft: The HO version typically featured a more aggressive camshaft profile. This resulted in improved valve timing, leading to increased power and potentially a broader power band, but might also affect low-end torque.
* Performance Intake Manifold: The HO engines often utilized a different intake manifold design, optimized for better airflow and improved cylinder filling at higher RPMs.
* Exhaust System: The exhaust system on an HO engine might have less restriction (larger diameter pipes, different mufflers) to allow for better exhaust flow and increased power.
* Other Potential Differences: Depending on the specific application and year, other differences might include things like different pistons, connecting rods, or heads (though this wasn't always the case; the difference often lay primarily in the components listed above).
In short, while both are 5.0L engines, the HO version was tuned for performance, leading to significantly higher horsepower and torque compared to the standard 5.0L engine. The standard 5.0L prioritized fuel economy and lower emissions to some extent.
