Quote: I'm running a 260/266 @ .050" cam and I've got 6 1/2" of vac.
As mentioned, I'd degree the cam first [ EDIT: set the timing] then check for vac leaks.
Mine isn't much better but I pull 6" with a 275/275 @.050 solid and that's with initial timing at 20 BTDC. I have the same problem right now too in the fact that mine doesn't seem to want to pull much past 6800 and should hit 7k immediately. Hope you have good luck with it.
