Bad valve seals impact performance?

[NeEmO6]

As i recently had my exhaust manifold off i looked into the head to see if my valve seals were leaking since i was blowing smoke. Sure enough they are leaking. What im wondering is how bad is it to performance wise to have bad valve seals?? Im wondering on how big a priority i should make it.

 

[oldman]

As i recently had my exhaust manifold off i looked into the head to see if my valve seals were leaking since i was blowing smoke. Sure enough they are leaking. What im wondering is how bad is it to performance wise to have bad valve seals?? Im wondering on how big a priority i should make it.

You can easily over pressurize the crankcase which can lead to a lot of other issues. The important question is how did this happen in the first place. I blew my turbo and valve seals last year because my oil catch can froze on me, how are your pcv and breather valve routed? Dipstick popping? Oil leaks?

 

[NeEmO6]

Im not sure how the valve seals went out, i would assume theyre were like that when i got the head over a year ago. I dont have a pcv valve, i plugged up the nipple from the intake manifold and have breather filters on the valve cover nipples. This dipstick does not pop out, i used to when i had a pcv valve on.

 

[Defiant]

http://vfaq.com/mods/Valvestem-seals.html