I think that the IVO means Intake Valve Opening, Maybe not shruggyI have seen solid lifter cams have a much different rate of IVO, IVC, EVO and EVC than the same duration, lift and LSA on a solid roller cam has, much different work Way more valve to piston clearances on the solid roller cams in relationship to TDC shock shruggy

Last edited by Cab_Burge; 05/27/15 01:11 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)