bukbukintegra

my friend says that this should be done on strictly race motors... the wear on the head will be greater than stock... i was wondering if you all would reccomend a 3 angle valve job for a daily driven b18b1 @ 8psi...

ProjectDarkBlack

thats a standard valve job, 5 angle is what your friend is thinking of but that just wears out quicker not right away

blackeg

yea 3 angle is standard. to the best of my knowledge it should be done anytime the valves are removed, to ensure they seat properly again. either way it should be way less than 100 bucks

Fkned

Yes a stock head has a 3 angle valve job from the factory to begin with,it's just not very good for performance other then the ITR valve job.The amount of angles has nothing to do with the life of a valve job,for the most part.A performance/street valve job should be able to live in a street motor for as long as the rest of the engine stays tight.However this isn't a concern for a race valve job where HP is what's wanted most,in this case the valve job is made with a somewhat narrow seat (where the valve head and the port seal)for a greater amount of flow usually.
The valve job doesn't need to be redone just because you removed the valves,you can replace the valves w/o redoing the valve job as long as the valve job is still concentric to the valve guide and they still seal well.The longevity of a valve job is more determined by the guide clearences and spring pressures then anything else for the most part.
I don't feel I'd trust some place that charges less then a couplea hundred bucks for a valve job,the amount of time/tooling/equipment involved to do a good job makes that a very low price and they must not do very good work imo,due to the fact of the low price they obviously have to charge to get work.

HEAD

you should stop talking to your friend that told you that


...great answer Ed.

bukbukintegra

thank you all for the very helpful answers... i was wondering... what exactly people do to the valves? i read somewhere that the cuts in the valve help smooth out the airflow... is this right?