Hey guys, I am building my b18A1 head up for my swap... I am ordering an omni power valvetrain, the question I need answered is should I get +1mm oversized valves or +.05 oversized. I heard from a reliable source that if I go +1mm it weakens my head and cause it to crack between the valves. Is this true?

If I go .05mm i can use my stock valve seats right? and will it be safer than going +1mm? and is it worth only going +.05mm, with enough work done to my motor will this benefit me at all? Any info on this will help.

After I decide whether to go +1mm or +.05mm, I need to know what kind of work my head will need, like what all needs to be done, where it can be done at and about how much will it run me.

Any info that can help is very appreciated.