Valve stem heights

[Urgefor]

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?

[frnkeore]

That is not enough to worry about.

[pbf777]

     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. 

[Ford428CJ]

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.

[pbf777]

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.

[Ford428CJ]

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….