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SVT Shelby GT500
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<blockquote data-quote="Catmonkey" data-source="post: 16029204" data-attributes="member: 124025"><p>Here's a chart of BJ's (VNMOUS1) GT500 from an article <a href="https://www.fordmuscle.com/tech-stories/engine/building-a-931-horsepower-5-4-liter-on-a-budget/" target="_blank">here</a>. The only difference between these two pulls is the installation of the L&M cams. No doubt, these cams make great power on the top side, with the coveted lumpy idle, but look at the impact in the area I circled. These are typical rpm ranges that you'll encounter on the street, although not necessarily at WOT. What you don't see is the impact at even lower rpm. I can't speak for the exact rpm ranges at lower rpm, but I doubt these cams would be happy at less than 2,000 rpm, possibly more. In my car, with 3.73s, that's 85 mph. Can it be done at lower rpm, sure, but expect to downshift a lot.</p><p></p><p>I drive my car mostly on the street, but it is not my primary driver. I've been wrenching for almost 50 years, so I have made my fair share of camming mistakes. Swapping out cams in an old pushrod V-8 is a cake walk compared with the modular, so they're not so easy to remedy if you don't like the drivability. The end result in this case is a gain of 60 horsepower on the top end. But with even the mild stock cam, you're not going to hook up all that well with 850 rwhp and 825 lb. ft. of torque. The cams in your 2013 are a bit more aggressive than those found in the stock 5.4 too.</p><p></p><p>[ATTACH=full]1521733[/ATTACH]</p></blockquote><p></p>
[QUOTE="Catmonkey, post: 16029204, member: 124025"] Here's a chart of BJ's (VNMOUS1) GT500 from an article [URL='https://www.fordmuscle.com/tech-stories/engine/building-a-931-horsepower-5-4-liter-on-a-budget/']here[/URL]. The only difference between these two pulls is the installation of the L&M cams. No doubt, these cams make great power on the top side, with the coveted lumpy idle, but look at the impact in the area I circled. These are typical rpm ranges that you'll encounter on the street, although not necessarily at WOT. What you don't see is the impact at even lower rpm. I can't speak for the exact rpm ranges at lower rpm, but I doubt these cams would be happy at less than 2,000 rpm, possibly more. In my car, with 3.73s, that's 85 mph. Can it be done at lower rpm, sure, but expect to downshift a lot. I drive my car mostly on the street, but it is not my primary driver. I've been wrenching for almost 50 years, so I have made my fair share of camming mistakes. Swapping out cams in an old pushrod V-8 is a cake walk compared with the modular, so they're not so easy to remedy if you don't like the drivability. The end result in this case is a gain of 60 horsepower on the top end. But with even the mild stock cam, you're not going to hook up all that well with 850 rwhp and 825 lb. ft. of torque. The cams in your 2013 are a bit more aggressive than those found in the stock 5.4 too. [ATTACH=full]1521733[/ATTACH] [/QUOTE]
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