So get ready, this is pretty weird and i need some help on what to do. my friend took my car out awhile back and took it from 60mph to 1st gear, it did some damage but wasnt to major as the car ran for 4 months until the headgasket blew, took apart the motor pulled the valve train cover off, and we noticed i had 4 rockers that were off, we found them no scoring on the cams or rockers, rockers also appear to be fine, but here comes my other problem, i cant seem to find what its called all i have found so far was top hat valve shims, they sit under the rockers its a little cap, we found all 4 rockers but we cannot find the 4 caps, the motor appears to be fine pulled the head off no knicks on the piston so it couldnt have fell in there we checked all passages and cant find them, pulled my oil pan and oil filter and still cannot find them.. Kind of worrying since they are steel and can get knocked around inside the motor but its also been 4 months so it shouldve happened by now, the only reason the car started acting up more is because the headgasket blew. We looked at my vavles and they do not look bent, so were confused on how the rockers were able to get out. were going to be inspecting the bottom end before repairing everything to make sure we do not see the caps, but were can i find the caps and what are they called? the closet thing ive found is top hat vavle shims, or cap vavle stems, with the part number 13716 from toyata. with no picture tho. Can anyone tell me why the rockers fell off where do you think the caps went in the motor? and will everything be fine to put back together? again there is no scoring, on the cam nor the rockers, they are smooth and appear to be fine. everything else in the motor appears to be fine which is amazing and kinda of worrying at the same time...