What revs at 60MPH

[Kurt in NJ]

50 year old bald tires at 67 MPH?

Please let me know when you are driving the car. I don't want me or my family near you.

I work on modern cars, next time you are stopped in traffic and there are cars on each side, in front, and back one of those cars has a much more serious problem than old near bald tires ---- tires,suspension,brakes that the owner knows about and declined the repair ---tires showing 2 layers of cord, inch or more play in ball joint ---siezed brake calipers, rusted brake pipes with one line crimped off ----I see this work declined every day, but the radio, sunroof get fixed!

 

[Ruth]

Anytime I try to drive 45 i end up over 50----the second day after I rebuilt it I knew it would go 67, I have original stock head, no overdrive, have driven over 65 all day...

What rear end ratio are you running? With stock gearing (3.78's), at 67 your engine would be spinning ~3000 RPM (on paper). More in real life.

I thought 2200 - 2400 was max safe RPM on an A stock motor.
Yes, No?

That is similar to what I have heard... At 50 MPH my engine is at 2200 RPM. (Using Tach and GPS).

 

[GRutter]

You would also need to consider 28-28 vs 30-31 (21" vs 19") wheel diameter, as the rolling diameter of the tire will have an impact on speed at any given RPM with the same ratio rear

 

[Tom Wesenberg]

I thought 2200 - 2400 was max safe RPM on an A stock motor.


Yes, No?

I would say yes, and for more speed, I'd install 3.27 gears or overdrive.
40 to 45 is an enjoyable speed, but you need to find some good Wisconsin roads for that. Too many fool drivers in Minnesota.

 

[Ruth]

You would also need to consider 28-28 vs 30-31 (21" vs 19") wheel diameter, as the rolling diameter of the tire will have an impact on speed at any given RPM with the same ratio rear

According to Lucas Classic Tires a 28/29 tire (4.40/4.50-21) is a ¼" taller than a 30/31 tire (4.75/5.00-19). I don't think you would see much impact.

 

[30 Closed Cab PU]

I would say yes, and for more speed, I'd install 3.27 gears or overdrive.
40 to 45 is an enjoyable speed, but you need to find some good Wisconsin roads for that. Too many fool drivers in Minnesota.

My Truck had 4.11, could not keep up with others, so had 3.54 installed.


I like a relaxed slower pace and drive anywhere from 30 - 45 mph max. Live in a small town of about 20,000 people in Wisc, stay away from Interstates, busy state and county roads as much as possible. I tense up and do not enjoy those roads. Some times go out exploring, getting lost, and use Google Maps on my cell phone to find my way home.

 

[ryanheacox]

I like this website for calculating RPMs and speed at a given RPM. http://www.grimmjeeper.com/gears.html



Like others, I don't think I'd want to cruise at 60 for many reasons. I did see if my car with it's new engine could do it and yes, it can do 65 but I didn't keep it there more than 30 seconds.



In my rural area cruising at 50-55 is safely doable and my car seems perfectly happy to do it. That's about 2200-2400RPM.

 

[Jim Mason]

From 32-37 service bulletins

 

[Dick Steinkamp]

From 32-37 service bulletins

Too small to see.

 

[Jim Mason]

....

 

[NZ28ModelA]

That is a fantastic chart..

Thank you all for your responses.

Steve N.Z.