3 angl valve grind

[STL17]

Just wondering wat a 3 angl valve grind is and wat power gains would u see from them in na form

Pics would be helpful

[Adamvr93]

A normal valve grind is ony ground at one angle, and a 3 angle is ground at a a 30 degree, 45 degree (the sealing surface) and 60 degree angle (i think those are the correct angles).
so it makes the valve seat more rounded and aerodynamic.
it increases the flow of the port quite alot at low lift...

you would only really get this done if you were doing a full port & polish of the heads.... so with a port and polish plus 3 angle valve job you would get a good gain... probably 10 - 15KW?
i guess it depends on what other mods you have done also.

someone else will probably know a bit more about it than me.

Adam.