The answer is no. Don't use the 10w30 with a flat tappet cam . If the oil container says for Gasoline engines only and has the round sunburst symbol, then it has no zinc additives and is unexceptable to use in engines that do not have roller cams. I know of no 10w30 that still has zinc . Valvoline racing oil has zinc and there may be others too but do some research or you may wear the lobes off of the camshaft, scattering that debris all through your engine .