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According to Ken, "Our goal with this head in this application was to produce a peak intake airflow rate of 320cfm while maintaining intake port runner volume at a moderate 270ccs compared to a ported 906 head's volume of 190cc." As for flow balance, the exhaust port is 75 percent of the intake and deemed a high-velocity head, perfect for the moderate airflow goal we were interested in obtaining. "Will the 542 make the most horsepower with this head?" you ask. "No," according to Lazzeri. "This engine has far more potential--it is basically a detuned race engine specifically designed for a street machine. With a much larger port volume and greater airflow volume rates, the 542 could easily produce 800hp with a roller cam, high compression, and fully ported heads--maybe even with the 440SR head." View Related Article