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Message: <blockquote data-quote="sneaky98gt" data-source="post: 711718" data-attributes="member: 11327">Compared to a 4.6, the 5.4 does have quite a bit more rotating mass and pretty good bit more stroke, a little more than half an inch, IIRC, and that's a lot in motor terms. And it's not entirely that it's a heavier rotating mass and longer stroke, but also that the heads, cams, and intake don't flow enough in stock form to benefit from the added cubes.And also, IIRC, the 350 has both a longer stroke, and a larger bore. Apples to oranges here...Equal heads, cams, and intake, the 5.4 will run out of breath WAY before the 4.6, probably close to 1000 rpm before. For as long as I've been around cars, I've ALWAYS been taught that you make power with the top end of the motor (heads, cam(s), intake), not with the bottom end. And while at the same time I've been around the "no replacement for displacement" crowd, the guys that tell me that won't skip a beat saying that the better H/C/I setup will win a race, every time. Displacement isn't everything, as a lot of people like to think it is. I'd still love to see a 4.6 and 5.4 side by side, all other things equal. I never said that boring and stroking will always make you slower, but until I see evidence otherwise, that's the assumption I'm going to make about the 5.4. I can't count the number of very car-knowledgeable people I've heard say that the 5.4 is a waste of time and money. A member on another board I'm on poured tons of money into a 5.4 build: heads, cams, intake, etc, etc, and got like an 8.4 in the 1/8 out of it. I know guys with bolt on/geared 4.6 2 valves that do that all day long. And like I already said, until I see otherwise, that's what I'm going to assume is the limit of them. Maybe I'm right, maybe I'm wrong. I'm honestly ready to see the results of 1996mustangGT's build; I've been keeping an eye on it for several months now. Maybe he'll disprove me. And if he does, then that's great. It'll be a revelation to the 4.6 crowd out there, and it'll probably change some minds. But no one has really done it yet, and till someone does, I'll keep my current opinion.Lost the argument? No, I think I got that under wraps in my first response to 1996mustangGT. Y'all say that there is "no replacement for displacement". I'm making more power than a lot of cars with much larger motors than mine. Therefore, I have proved that there IS a replacement for displacement.  <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite9" alt=":eek:" title="Eek!    :eek:" loading="lazy" data-shortname=":eek:" />ccasion14: Yea, same here. I have probably come off as caring more about this than I really do. I just really love to ruffle the feathers of the "no replacement for displacement" crowd sometimes. Different motors all trying to get the same thing accomplished: go fast. And we ALL have a good time doing it, regardless of how we go about doing it.Different strokes for different folks I guess. Oh, the punnage. I'm sorry; I couldn't help myself.  :laughing4:</blockquote>