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SVT Shelby GT500
What cam for JDM 5.4 with a 4.0
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<blockquote data-quote="Catmonkey" data-source="post: 16068779" data-attributes="member: 124025"><p>I can tell you there are no cams with an EO number for 5.4. I don't know what your state emissions laws are, so I have no idea what they look for, but found <a href="https://www.dmv.com/ri/rhode-island/emissions-testing" target="_blank">this</a> on the internet after search. What they do is going to be pretty tough with much modifications. I think the 13-14 could be a safe bet, but there is no guaranty, because the 5.8 has 25 more cubic inches to "tame" that cam. I'd be pretty reluctant to go beyond that. Any tuner will tell you that the idle a/f ratios jump around quite a bit with any amount of overlap. The more overlap, the worse it becomes. </p><p></p><p>You have to ask yourself what your fall back position is if it doesn't pass. Swapping out cams is not a cheap endeavor, unless you're doing it yourself. I hope you're planning on using cats with your long tubes for the emissions test. I'd look for a some high performance shops in your area and speak with them about what their customers have been able to get away with on the emissions angle.</p></blockquote><p></p>
[QUOTE="Catmonkey, post: 16068779, member: 124025"] I can tell you there are no cams with an EO number for 5.4. I don't know what your state emissions laws are, so I have no idea what they look for, but found [URL='https://www.dmv.com/ri/rhode-island/emissions-testing']this[/URL] on the internet after search. What they do is going to be pretty tough with much modifications. I think the 13-14 could be a safe bet, but there is no guaranty, because the 5.8 has 25 more cubic inches to "tame" that cam. I'd be pretty reluctant to go beyond that. Any tuner will tell you that the idle a/f ratios jump around quite a bit with any amount of overlap. The more overlap, the worse it becomes. You have to ask yourself what your fall back position is if it doesn't pass. Swapping out cams is not a cheap endeavor, unless you're doing it yourself. I hope you're planning on using cats with your long tubes for the emissions test. I'd look for a some high performance shops in your area and speak with them about what their customers have been able to get away with on the emissions angle. [/QUOTE]
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SVT Shelby GT500
What cam for JDM 5.4 with a 4.0
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