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Old 08-12-2017, 07:42 PM
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gthompson gthompson is offline
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Cobra Make, Engine: CSX 3020 Competition, 427; CSX 4385 Aluminum Body, 427; CSX 2096, 289
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Quote:
Originally Posted by olddog View Post
Yes your rpm is accurate give or take 200, as I can make those numbers work within that range. Assuming the 4000 rpm 85 mph is the most accurate number and assuming the 3.54 rear gear is a fact, then I calculate a 25.3" tire.

I also calculate 1800 rpm will give you 60 mph with the .64 5th gear.

If the 3000 rpm 60 mph is correct then you have a 23.8" OD tire and 1920 RPM will give you 60 mph.
Sorry
I forgot to mention the tires
I have the Goodyear Billboards
I believe they are 26" OD
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