Re: Driving on the freeway
As said above, it depends on tire size and rear end ratio. What I can add to the equation is that my '51 with a slightly modded '51 Merc engine with a set of Edmunds heads, a Rochester 2G, and a Mallory dual point cruises at a little over 70. This car has 3.55 gears and 225/75R15 tires. The engine is really happy at 2300 RPM, and starts to get unhappy at 2700 RPM.
Just plug that into your equation.
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