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.
You could have a fuel delivery problem. If you have enough head on it to use that cam, it shouldn't nose over.
I'm running 24* initial just to get off the transition circuit onto the idle circuit and I'm still running rich. It's a fairly new motor but I think I hit 6500 a few times last summer. Mine ought to spin up to 7K as well.
I had as much bad luck as a guy could have putting this one together. It fought us every step of the way. How 'bout it Lyle? I mean really, when was the last time you've seen a core shifted cam??
