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Message: <blockquote data-quote="drummydrew" data-source="post: 1064660036" data-attributes="member: 172853">good evening all, i started asking for advice under Car Talk section but i believe it's more appropriate to discuss real car problems in this section. to cut story short, my car started spitting and rumbling few days ago and sent it in, these are the identified problems as of now:1. broken valve spring 2. broken inlet valve 3. broken inlet valve guide4. chipped water vents on the cylinder head (requires welding and sanding according to mechanic)5. dents on piston heads, caused by what seems like the valves due to the round-edged dents for further details of discussion please refer to pix attached and link below:http://www.zerotohundred.com/newforums/showthread.php?t=461048&page=2my main concern now:1. should i replace the valve spring/inlet valves/valve guides by the sets of 8 or it is ok to replace just the broken ones? 2. can't find ori parts, will the japanese made oem parts work just as well? 3. i'm totally clueless on the marks on the piston heads<img src="https://zerotohundred.com/forums/styles/default/xenforo/smilies/banghead.gif"  class="smilie" loading="lazy" alt=":banghead:" title="Banghead    :banghead:" data-shortname=":banghead:" /><img src="https://zerotohundred.com/forums/styles/default/xenforo/smilies/banghead.gif"  class="smilie" loading="lazy" alt=":banghead:" title="Banghead    :banghead:" data-shortname=":banghead:" /><img src="https://zerotohundred.com/forums/styles/default/xenforo/smilies/banghead.gif"  class="smilie" loading="lazy" alt=":banghead:" title="Banghead    :banghead:" data-shortname=":banghead:" /></blockquote>