FE Power Forums
FE Power Forums => FE Technical Forum => Topic started by: Urgefor on July 09, 2024, 01:47:20 PM
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Long story short I had some larger valves put into a set of 6090G heads awhile back. I'm finally ready to get them installed but noticed what appeared to be differing valve stem heights upon closer inspection. A straight edge and feeler gauge says all of the exhaust valve stems are .007 to .008 lower than the intake valve stems. Spring closed height is within the specs I gave the machinist. In retrospect, I probably should have given one specific install height to avoid any confusion. I made the assumption the machinist would make them all the same height but within the range I gave. Live and learn I guess.
This isn't a race engine. Maybe classified as street/strip but in reality mostly street. Thoughts?
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That is not enough to worry about.
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There can be many different reasons for varying valve stem tip heights and not necessarily being a negative indictment of the workmanship by the machine shop. And as stated previously, the sum your encountering shouldn't present a problem. :)
Scott.
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Long story short I had some larger valves put into a set of 6090G heads awhile back. I'm finally ready to get them installed but noticed what appeared to be differing valve stem heights upon closer inspection. A straight edge and feeler gauge says all of the exhaust valve stems are .007 to .008 lower than the intake valve stems. Spring closed height is within the specs I gave the machinist. In retrospect, I probably should have given one specific install height to avoid any confusion. I made the assumption the machinist would make them all the same height but within the range I gave. Live and learn I guess.
This isn't a race engine. Maybe classified as street/strip but in reality mostly street. Thoughts?
Even from the Factory… FE’s came that way. A little shorter on the exhaust valve than the intake valve. I’m sure the reason why, was because the exhaust valve is hotter than the intake side. Little more spring pressure.
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Even from the Factory… FE’s came that way. A little shorter on the exhaust valve than the intake valve. I’m sure the reason why, was because the exhaust valve is hotter than the intake side. Little more spring pressure.
I was under the impression that it was done because the exhaust valve and seat faces were expected to erode faster than that of the intake side and hence provide a bit more time before servicing might be required. :-\
Scott.
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Even from the Factory… FE’s came that way. A little shorter on the exhaust valve than the intake valve. I’m sure the reason why, was because the exhaust valve is hotter than the intake side. Little more spring pressure.
I was under the impression that it was done because the exhaust valve and seat faces were expected to erode faster than that of the intake side and hence provide a bit more time before servicing might be required. :-\
Scott.
Sure, all heat related stuff….