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Old 10-22-2013, 05:46 PM   #1
lostsoul23m
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Valves

When I do upgrade my cams, should I also have the valves changed out? I am at 87k miles, getting ready to get a tune and running an SRI, header, and race exhaust with more mods to come.


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Old 10-22-2013, 07:27 PM   #2
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You don't just "change out" valves

If you really want to, then remove the head, take it to a machine shop to have them vacuum test the combustion chambers to check the valve to head seal. If necessary, they will regrind the valves and seats. this is expensive, a good valvejob is labor intensive. Unless you have good reason to think there is an issue, don't bother.

Valve springs on the other hand, perhaps, depending on what the new cam needs for seat pressure and on the nose pressure. But overhead cam motors run weak springs to begin with unless you are going absolutely nuts with the new cams, not needed.
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Old 10-22-2013, 07:49 PM   #3
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Why would you need to change out your valve's? Are you going w/ bigger ones or what? I'd install the cams & enjoy. What cams do you have?
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Old 10-23-2013, 07:29 AM   #4
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You don't have to mess with valves, but you should know that most all engines do begin to show some exhaust valveseat wear around 100K miles. The parts now are better than days of old but my zetecs show they could use exhaust valve grinding around that mileage. Engine will still run fine without it but you DO pick up some small amount of power when they are recut that you will feel when stomping on it. The intakes are not a problem, they pretty much are just like new. 100% unleaded fuel is hard on exhausts though, they still try to recede and the sealing surfaces will get a little rough by around 100K.

You can check that with a compression leakdown test which is different from a standard compression test. And without pulling head.
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