Really, how long did the cam last?
Not trying to be funny, years back I tried solid flat tappets on a hyd grind and within 100 miles it flatten the cam and dished the lifters. Same springs, Kendall oil 10w-30 oil pressure was normal.
You have to tight lash them. Less than .010 normally. I've never done it myself, but I've seen it done for a long time on street cars successfully. I'm still not sure I'd do it though. Just run a solid cam.
