Thread: Roush 427 & 402 Differences
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Old 03-02-2009, 04:37 PM
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twobjshelbys twobjshelbys is offline
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Join Date: Jan 2009
Location: Las Vegas, NV
Cobra Make, Engine: Shelby CSX4005LA, Roush 427IR
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I agree with the 2000RPM for 427IR. After crawling through the adjustments on the throttle intakes (all 8 of them) I finally got it to idle smoothly and it seems happy at about 1200RPM with no load but does want to be about 1800-2000 when in gear.
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