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Message: <blockquote data-quote="garrittpwl" data-source="post: 1490643" data-attributes="member: 21560"><p>So going to revive an old thread here but I've been freaking out in my head. I'm literally writing this as I file fit my rings lol. I've been talking for some time about building a 5.4 and have gotten to the assembly stage (probably too late to ask these questions but it is what it is). Current build is forged rotating assembly, flat top pistons, PI heads and comp xe278ah cams. Per what I've read, pump gas doesnt like above 8.5:1 dynamic. per the calculators out there, my engine will have 8.9:1 dynamic. Should I be worried about this?</p></blockquote><p></p>