So i picked my head up from the machine shop yesterday afternoon( i had valve guides installed, valve job, springs installed), after getting home and inspecting it i notice that one of the guides appeared to be a 1\4 shorter than the rest while looking at them through the exhaust port. I took the head back to the machine shop 1st thing this morning and showed them the guide. The machinest told me that one of the guides that i supplied was shorter than the rest but this should not cause a problem with it fuctioning properly. Does any know if this will cause any problems and if so why? I can also provied pics if needed. This is on a p72 honda head if it makes a diffrence.