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Re: How many rpms does a 454 like on the highway?
RPM won't hurt anything. Mileage will be low 6 to 8 MPG range. Put a 4L80E in it and reap the rewards of 20-25% better mileage. Close to a Bolt in swap for a TH400. I have a 85 C20 Suburban that was 454/TH400 3.73 235/85/16 changed to 4L80E and really like it.
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