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Re: How many rpms does a 454 like on the highway?
Assuming 235/85r16 tire size with that combo of parts --
70 mph -- 3500 rpm
65 mph -- 3300 rpm
60 mph -- 3000 rpm
55 mph -- 2800 rpm
Larger tires would drop these rpms somewhat. These are all spinning the engine faster than ideal for fuel economy, but it's what you have to work with. It's not worth regearing just to save on fuel for that one-time trip. Someone else can answer as to whether continuous 3000+ rpm is okay for a 454 or not.
To check out other tire sizes, punch your numbers into the calculator at grimmjeeper.com. It's the best gear ratio calculator I've seen.
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1987 C6P V20 truck, 2010 LMG 5.3, AFM delete, 2010 Camaro exhaust manifolds, 1997 nv4500, 1991 np241c, hydroboost, 2005 14bff axle & driveshaft, drop-n-lock gooseneck, 4.10 gears, stock suspension, rims, and tires. Still a work in progress. Any questions or suggestions are welcome!
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