titanium valves

hi was wondering how long would you expect a set of titanium valves to last in a set of C heads?
and what is the biggest push rod you can fit into a C head before running into trouble?
thanks

+ =

procharger 528 wrote: hi was wondering how long would you expect a set of titanium valves to last in a set of C heads?
and what is the biggest push rod you can fit into a C head before running into trouble?
thanks

There are several varibles that determine how long the valves last. For example;
1. The valve seat angle. 45* last longer than 55*.
2. Whether or not the valves have ever been floated.
3. Are the valve seat contact surfaces coated with a DLC, CrNi, or TiNi coating?
4. And other factors, such as how often you race, but a set should last 2 to 3 years maybe more.

As for pushrod clearance, if you have never run a set you don't know this, but you are "into trouble" from the get-go with brand new C-460 heads, and intake pushrod clearance. However, after you resolve that problem, you can generally run a 7/16" tapered pushrod.

Hope this helps,
Charlie

the valve seats are 45 the engine has done about 70 passes n/a at about 8400rpm,the valves look good.
i was running 3/8 push rods and had to clearance the push rod holes for those,
the engine is going back together with a procharger on it,
i was hoping to run a bigger pushrod as the old ones had a little flex in them...thanks for the reply

You should be able to get a straight wall 7/16" in the exh. side....more room than on the intake side. Get a .165" wall if you can.

With CNC'd pushrod slots you can put these 7/16" babies in there.