383tpimachine wrote:
Quote:

j3studio wrote:
Quote:

383tpimachine wrote:
For a high RPM I would get rid of the VVT and change heads to a nice cathedral setup like trickflows, PRC, AFR, or TEA. The big valves of the LS3 heads dont like RPM.

A) I totally believe you.

B) We're proud new owners of an LS3.

C) It will never be raced.

D) I'm just curious.

The question: at what kind of RPMs do those big valves cause problems? Can you tell me why?

They are fine up to 6800 or so rpm with STOCK springs. Beyond that better springs/rockers are advised to control the valvetrain events better.

Plus I am not a fan of hollow valves

Those heads are also thin. So I do not like them with boost. Nitrous is more forgiving but I would want to aftermarket castings for boost.