3 Oct 2012 SKU BC3925 $67.80 Available BC premium valves guides are made from BC guides are resistant to cracking and corrosion, while reducing friction and insures The perfect replacement to worn or damaged guides and 100% compatible 23 Jun 2010 The other day I noticed oil leaking from the exhaust manifold port (cylinder #1). It looks like its coming from a worn out/bad exhaust valve seal. 7 Feb 2008 Are the valve stem seals leaking that bad to where you need to replace them? Are you sure its the valve seals that are making it smoke? 7 Feb 2008 Im about to buy a ka with suposebly 90k but the seller is telling me the valve steam seals are bad and hes giving me a set. now i've pulled a few 30 Oct 2008 ^^^Again, I'm pretty sure it would be bad valve guides. Hence on startup the smoke is worse then after warming up because overnight the oil 18 Jan 2019 Ask a Mechanic. symptoms of bad piston rings and valve seals Although bad valve seals and piston rings have similar symptoms, the time and costs of repairing them are quite different. STD 91-99 Nissan 240SX Altim10 May 2009 if its just the valve stem seals, then all you gotta do is replace em right? If I'm right its not much. All you'll need is a new valve cover gasket and To properly perform a port job it is recommended to drive out stock valve guides and we recommend driving back in a set of bronze guides when the port work is