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SVT Shelby GT500
Another build thread
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<blockquote data-quote="RBB" data-source="post: 15891968" data-attributes="member: 152686"><p>The initial runs were from 2000-5000. It was picking up knock the entire time. I figured the pulley combo was borderline for 93 octane. The cams and cut/port job on the lower intake manifold really helped to bring the boost down, but it still spiked lower in the RPMs. Tuner said let’s roll with that combo, but I don’t trust it so that’s why I put the stock upper back on for now. I don’t need to trash an engine for a couple more lbs of boost.</p></blockquote><p></p>
[QUOTE="RBB, post: 15891968, member: 152686"] The initial runs were from 2000-5000. It was picking up knock the entire time. I figured the pulley combo was borderline for 93 octane. The cams and cut/port job on the lower intake manifold really helped to bring the boost down, but it still spiked lower in the RPMs. Tuner said let’s roll with that combo, but I don’t trust it so that’s why I put the stock upper back on for now. I don’t need to trash an engine for a couple more lbs of boost. [/QUOTE]
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Another build thread
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