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SVT Shelby GT500
1,200-Horsepower Shelby GT500 Build
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<blockquote data-quote="Ben99GT" data-source="post: 15420996" data-attributes="member: 3519"><p>And why are you sure of this? Piston speed, longevity....what is your reasoning? Stroke has essentially nothing to do with the shape of the curve IF the engine has sufficient head flow and cam duration (and/or blower) to feed the given displacement/RPM.</p><p></p><p></p><p></p><p>The importance of an engine being over square, square or under square is widely misunderstood and given far too much importance. There are many, many 8500+ rpm big blocks with a 4.5- 4.9" strokes that make power at 8000+ and live a nice long life; but put a 4.415" stroke in a Modular and people lose their minds. </p><p></p><p></p><p> </p><p>The Coyote's ability to rev to 7500 has nothing to do with its bore and stroke being balanced. The Coyote doesn't rev to 7500 because it is basically a square engine. Coyote's rev to 7500 because they have readily available intake manifolds that facilitate that kind of RPM, factory heads/cams that will support that RPM, and a factory connecting rod robust with withstand that piston speed. </p><p></p><p>I just built a 5.4 for a GT500 that revs to 7800 rpm with no problem, with a 3.554" bore and a 4.165" stroke. All it takes is a decent connecting rod and the right cam profile. 5.4/5.8 GT500s are not hurting in the head flow department and FGT/GT500 heads will easily feed a 5.4 at 7500+ rpm in spite and the small bore and long stroke. </p><p></p><p></p><p></p><p>It is entirely dependent on the criteria of the build.</p></blockquote><p></p>
[QUOTE="Ben99GT, post: 15420996, member: 3519"] And why are you sure of this? Piston speed, longevity....what is your reasoning? Stroke has essentially nothing to do with the shape of the curve IF the engine has sufficient head flow and cam duration (and/or blower) to feed the given displacement/RPM. The importance of an engine being over square, square or under square is widely misunderstood and given far too much importance. There are many, many 8500+ rpm big blocks with a 4.5- 4.9" strokes that make power at 8000+ and live a nice long life; but put a 4.415" stroke in a Modular and people lose their minds. The Coyote's ability to rev to 7500 has nothing to do with its bore and stroke being balanced. The Coyote doesn't rev to 7500 because it is basically a square engine. Coyote's rev to 7500 because they have readily available intake manifolds that facilitate that kind of RPM, factory heads/cams that will support that RPM, and a factory connecting rod robust with withstand that piston speed. I just built a 5.4 for a GT500 that revs to 7800 rpm with no problem, with a 3.554" bore and a 4.165" stroke. All it takes is a decent connecting rod and the right cam profile. 5.4/5.8 GT500s are not hurting in the head flow department and FGT/GT500 heads will easily feed a 5.4 at 7500+ rpm in spite and the small bore and long stroke. It is entirely dependent on the criteria of the build. [/QUOTE]
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SVT Shelby GT500
1,200-Horsepower Shelby GT500 Build
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