Top End Miss

StrokerScamp said
That's what I'm thinkin. I mean I know valve spring pressure is important, but damn, 350 pounds is a ton. I wouldn't dare go to 400 +.

the spring rate maybe 400 but at installed its not anywhere near there... just like my 354's i have now only have just over 300 open... i wouldn't do 400 open either lol...

racerhog said
I'm more worried about the valve failing than I am the spring rate for the RPM....

well i have good stainless valves...