Airflow Research 235 Cylinder Head Performance Test Aftermarket Valvesprings
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For round two, the 235cc upgrade increased horsepower by 11 giving a new peak number of 621 hp at 7,100 rpm. When it came to the torque figures, the peak dropped by 1 lb-ft to 529 lb-ft at 5,300 rpm, however the overall average had improved by 2 lb-ft. View Related Article
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