Hi guys! I have a little problem.... I have a A14 racecamshaft without any specs and now I am going to manufacture a 4-1 race header for my race engine. I have all the formulas (Four stroke performance tuning, Graham Bell) but the spec of the cam is still missing! I have measured it but I am having problem to know which numbers to use!? I have measured it straight of the cam and the cam timing from 0mm lift should be IN 80/115 EX 115/80, measured from 1,27mm lift (0,050") the cam timing should be IN 15/50 EX 50/15, max lift measured of the camshaft is 8,15mm (0,320")! Which camtimes shall I use when I calculate what length the pipes should be..... I have also measured the cam from the valves, with the cylinderhead and rockerarms installed, IN 25/55 EX 55/25 (measured at 1,27mm valvelift) maxlift 12,25mm (0,480")!! Can anyone give me a clue??