These are just single springs with damper,911 springs.Last engine before this one was 5 years ago my 451, I used John Deere break in 30w for diesels very high zinc and then dumped it and put in the VR1 I'm sure this is a well discussed subject on here, but flat tappet users are going the way of the DeSotos but I've never had a wiped lobe but bought a few that were,I just getting my ducks in a row.Thanks Criterion, I know it's the two faces and the clamping force but seen a horror story on YT and freaked me out the older I get the more I worry about fresh engines,thank you guys for revisiting this subject,hate to be wishy-washy but the VR1 and bottle of ZDDP is already in it think 383man I'll just go with it,thanks guys