Roush 427 & 402 Differences

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#12 (permalink)

03-02-2009, 03:37 PM

twobjshelbys twobjshelbys is offline

CC Member

Join Date: Jan 2009

Location: Las Vegas, NV

Cobra Make, Engine: Shelby CSX4005LA, Roush 427IR

Posts: 5,647

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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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