Heres some good 5.4 4v reading... 1. TT 5.4 4v Build ---http://www.modularfords.com/threads/182016-Well-it-s-time-for-a-rebuild 2. 5.4 4v in expedition ---5.4 DOHC going in Expy this weekend... - F150online Forums 3. Eaton blower on 4v 5.4Eaton 4v Question - Lightning Forum | LightningRodder.com 4. 98 F150 - 4v Navigator engine ---4.6 to 5.4 DOHC and tranny swap - F150online Forums the way i look at it, the 4v will be a very rare and unique build and if im building an engine, might as well make it worth it. BUT if i go with the 4v there is a very low possibility that i run a turbo or a s/c just because i dont know that much about whats required for boost and it would be more custom fab work.. Here we go...