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Hello everyone, I am preparing myself to rebuild an EJ25 engine in my 2006 Subaru Impreza 2.5i SOHC. I want to make sure my valves are at or near original factory spec. If all I do is lap the valves, I understand that I may need to readjust the stem height. Will this cause any problem with compression or timing? Is there a way to determine if I need to recut the 3 angled surfaces on the valves? If I buy new valves for this used head, it looks like I will need to lap them, but will they sit correctly in the head?
Is there a way to check the valve seats and check it’s angles or is all this that I’m asking about for the machine shop to do?
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If your using stock replacement vales the lapping should be all you need. Since you are
rebuilding the engine, You may want a machine shop to check it. If you were replacing
a burnt valve I would say lapping a valve or two is ok. But with a rebuild You might want
everything checked and and let the machine shop determine in cutting is necessary. I just want
to see you do this once. 😉
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