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As an additional data point, i have just had my Z28 upgraded (headers, headwork, stage 3 cam) and have attached the dyno sheet. The dyno run was done in approx 85 degree temps with 93 octane fuel and the engine has done 5000 miles.
Stock numbers were 462HP/438TQ, a little less than the Motortrend Z running 91 octane. Post mods, its a completely different animal though with 577HP/514TQ.
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