Here is what will warp the valves... Detonation....make the valves real hot.
(usually too much timing @ WOT)
lack of idle timing on a cammed up motor... makes the valves real hot.
lean AFR @WOT (usually from a stock fuel system that cannot keep up) makes the valves real hot.
Add these three together and you are guaranteed warped-tuliped valves.
What happens when you run a engine with open ex manifolds or no manifolds at all is raw cold air (oxygen gets to the valves
(THAT ARE ALREADY WAY TOO HOT) and warps them. Sometimes the valves even crack.
One or more of these hot valves overheated valves conditions has to be present. (the valves actually glow red hot)
When the engine is running correctly, without one of these conditions present causing the valves to overheat, open manifolds, no manifolds, open headers etc etc
WILL NEVER warp valves.
All three of these tuning errors are common with inexperienced tuners.
Last edited by F-BIRD'88; 11-17-2012 at 07:49 AM.