valve seat pressure's
 

Has any one setup their Ls6 heads with the 1.29 diameter spring with a 175 seat and 475 open pressure if so good, or bad results in doing so ??

thanks

I'm using patriot extreme springs on my PRC LS6 heads with large 2.04" intake valve shimmed to 180lbs of seat pressure..2 years and 6000 miles no problems with LS7 lifters..You really only need that kind of seat pressure with large valves and high boost pressures..

Thanks and yes larger valves and boost coming and big cam :)