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Message: <blockquote data-quote="r3dn3ck" data-source="post: 279412" data-attributes="member: 9214">4v motors can make easily upwards of 500rwhp if you spin them to 7K+. Besides the block and heads for a 4v you'll need some .4" spacers for the K-member (this is not mandatory but makes it lots easier), .2" spacers for the tranny mount, a 4v 5.4L front cover and tensioner and your donor 4.6 for accessories and stuff. There's bound to be a grip of little things but nothing you can't get from Kragen.I would start with a 4v navigator block so you don't have to drill any holes but a 2v block will work with 1 hole drilled. After that, it's all the same stuff that changes from 4.6 to 5.4. B-head intakes are modded by Al Papito for about 1000 bucks.Figure with longtubes and a proper intake, done right with stage 2 cams and lightly ported heads in each case you can expect to be able to make as much as (+/- 20%):5.4 2v ~ 340rwhp/tq5.4 3v ~ 375rwhp/350tq5.4 4v ~ 425+rwhp/400tqThose are good numbers to shoot for. If you use stock headers or shorties, then you'll have a hard time ever reaching much more than about 300rwhp and 380rwtq. Remember, nothing is certain except that longtubes make the swap worth it on paper, but any header makes it worth it to your butt.</blockquote>