Head Porting Question

[Shane@DBPerformance]

You can't rate them for max RPM without knowing what cams they are used with. They probably aren't even usable with something like an FP2x or FP3x cam that requires some fairly strong springs.

[95talonracer]

So can I use them with the cams listed above that I got?

[Goat Blower]

Yes, the Crowers are fine with the 64114's.