D16Z6 Valve Sizing

[MaliWho97]

I'm building a boosted D16Z6, and before I take the head to the machine shop, I need to know what size valves I should do. Should I use the stock size, +.5mm or +1mm???? I've read that opening it up too much will hurt you, but am not exactly sure. Any help is highly appreciated! Thanks!

 

[Loco Honkey]

That kind of work isn't worth it on a D series. Stock size w/ boost will get you into the 11s.

 

[posol]

i agree- doing something like that is going to cost you 1000-1500, if not more.

 

[MaliWho97]

Machine shops charge that much????? Thats crazy........ Thanks guys.