I found this searching for the same answer. http://snow.prohosting.com/~johngift/intakefab.html .The formula is near the bottom of the page have to convert mm. to inches.hope this helps.
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88 5.0l atrim 8rib pulley stock bottom end ported heads & intake stock.T.B stock. c&l 76mm mass air conv.19lbs inj.vortech fmu 255lph intank. man. vlvbdy.c4.3000tci stall b&mpro rachet. 3.73gears tagirdle. ssm lowers all for $10500can including price of car.
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