please bare with me first off and thanks in advance..

so heres the problem, i blew my head unknown miles but looks really good as in no dark oil stains. its been port/ polished considered to be a stage one.

anyways so i bought a head with really dark oil stains which means could have really high miles.. or just boosted/ nitrious...got it back from the machine shop had them presssure test, resurfaced, hot tanked, new valve seals... ect ..

i found that the thing circled in red on the head i just got back from machine shop has these things ( im guessing has to do with vtec ) with springs in the middle to activate oil pressure.. well these are really hard like picture you trying to click a pen up and down with your thumb.. hard ones are from the older head that got back from the machine shop, like really hard/alot of resistence. and the ones from my head that looks like lower miles, but only because of the port and polish, are really soft.. so which one do i use?? both are 92-95 heads both single vtec.... help me out master techs??

any advice would be great..

fyi.. setup was a boosted greddy kit vitara pistons.. cam seized looked like oil journals to middle of cam bearings went dry and just ran really hot and eventually locked up... thinking it had to be a lube problem within the head?? would block go out too with this happening to the head?

 

Lost motion assemblies is what those are. I think new ones would be stiffer, or at least ones that weren't used as rough. I can't guarantee that, but maybe it helps.

 

yeah i was thinking the same thing with soft ones having more miles and new ones more firm.. it would only make sense... im gona do more research and see what my options are.. thanks..