474ci Engine Build - Pump-Gas Poncho Power
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At the console of the Superflow SF-901 engine dynamometer sits Chuck Spanel. After proper engine warm-up, he starts each pull around 3,200 and allows the computer software to increase rpm 300 per second until it reaches approximately 5,800. A series of eight pulls were made, each incorporating a plethora of carburetor and timing settings. Corrected peak power numbers of 578 hp at 5,500 rpm and 588 lb-ft of torque at 4,700 rpm were achieved with No. 81 and 89 jets (front/rear) in the Demon carburetor and 42 degrees of total spark lead. View Related Article
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