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Message: <blockquote data-quote="r3dn3ck" data-source="post: 278198" data-attributes="member: 9214">I can rev mine to 7K no problem. My get a little valve float with my cam but the bottom end will easily hold 8K. If you want to rev it, you have to build it for the revs. 4340 i-beams and hard bearings and a set of ARP studs top and bottom. Other than that RPM is all cam and spring selection. I've revved mine all the way to 6300 under load.Doing B-heads will require a modded intake. It's not impossible. B-heads make fat power on the 5.4's thanks to their huge port volume. Al Papito may be able to set you up with one of his short runner intakes, otherwise... make one.</blockquote>