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SVT contracted heavily with Roush Industries on development of the 5.8 engine, including at least some of the dyno work seen here. Like everything else, computers have exponentially increased what's possible with test equipment, including replicating exact test-track conditions on engine dynos for faster, more scientific testing. SVT did a lot of that with the 5.8, along with the usual endless hours of validation tests and data gathering, such as what this engine is undergoing. This angle does a good job of showing off the 5.8's impressively wide 10-rib supercharger belt.