Thread: 427 RPM at 60 mile per hour
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Old 07-15-2008, 08:20 PM
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SCOBRAC SCOBRAC is offline
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Join Date: Jan 2002
Location: Northern California, CA
Cobra Make, Engine: -Sold- Contemporary 427S/C # CCX-3152 1966 427 Med Rise Side Oiler, 8v 3.54:1 Salisbury IRS, Koni's.. (Now I'm riding Harleys)
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Seems a little high to me (for my preference) but if you have a tall tire maybe not. Based on your numbers you are in the 30 1/2" rear tire range. The motor makes no difference it's all in the math that gets you to a final drive ratio. I have a 3.54:1 rear and I see 2800-2900 with a 1:1 fourth gear (toploader) and a 315 35 17 (26") rear tire.

Is it possible your rear is lower than 3.55:1? The number you list put your tire in the 275 70 15- 305 65 15 range.
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Last edited by SCOBRAC; 07-15-2008 at 08:31 PM..
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