I'd check the lifter fit by cleaning each lifter/lifter bore with brake kleen then lightly lube the lifters/bores with WD40 then lift each lifter off of it's lobe with your finger then let loose of it & each one should fall back onto it's respective lobe with a resounding thunk & if any of em dont then they are too tight & will not rotate properly & the cam/lifters will wipe. Other than that if the psi was not excessive & it started immediately then I'd say bad metallurgy in the comp cam and or lifter(s) which I've heard complaints regarding them. Sorry for your misfortune