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"Number of exhaust valves per cylinder (usually 1, 2 for 4-valve)    p 28"
"Outside diameter of one exhaust valve in inches                     p 28"
"Avg diameter of runner or header pipe (enter 'C' to calc)           p 29"
"Length of header pipe & port in inches from collector to valve      p 29"
"Port/valve flow efficiency (enter 'C' to calc from flow bench data) p 29"
"Flow efficiency of header (enter 'C' to calc from flow bench data)  p 30"
"CFM flow of exh @1.5''Hg, Open Headers=100000 (enter 'C' to calc)   p 30"
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"Enter 'Y' or press <F1> to accept values and return to MAIN MENU"
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