RE: Engine RPM at highway speed

[Brian Schlump <jsbs@xxxxxxxxxxxxx>]

Jeff,
You are correct.  I put a new tach in the Charger last week, and the rpm 
was 2450 at 62mph.   The Belvedere should be very close to that.


ledman_70@xxxxxxxxxxx wrote:
> 
> 2200 rpm at 62mph sounds pretty low to me Brian. I have a 426 4-spd in a 
> 
> 64 Polara with 3:23 suregrip and mine runs about 3000 rpm at 65 with a 
> 275/60/15 tire, which is a bit taller than yours. If yours is correct, 
> then I guess I better double check mine. I want to install 3:73 gears, 
> but if mine IS correct, I would be running over 3500 rpm at 65.
> Jeff
> Brian Schlump wrote:
> > 
> > I'm puzzled by the difference in engine RPM with my 2 cars, that each 
> > have a 3.23 Sure Grip.  I usually drive at 62 mph on the 2 lane roads in 
> > 
> > 
> > our area.  My '64 Belvedere has a 426 Max Wedge with a 4 speed 
> > transmission and P245/60/15  rear tires.  It tachs at 2,200 rpm at 62 
> > mph.  I recently had a '68 Charger restored and it has a 440 engine with 
> > 
> > 
> > a 727 big block transmission and F70/15 tires.  It tachs at 3,300 rpm at 
> > 
> > 
> > 62 mph.  I've checked the rpm on both cars with a second tach and I've 
> > had my wife follow me in her new car to verify that I'm doing 62 in each 
> > 
> > 
> > one.  The 727 was rebuilt as part of the restoration.  It shifts through 
> > 
> > 
> > all gears and downshifts into 2nd when I hit passing gear on the 
> > highway.  The fluid hasn't discolored in 600 miles, and doesn't smell 
> > burnt.  Today the restoration shop installed a new converter, but that 
> > had no impact on the rpm at highway speed.   Does anyone else have a 727 
> > 
> > 
> > with a 3.23 rear end combo?  If so, what engine rpm do you run at 
> > highway speeds?  Any other ideas?
> > Brian
> > 
> > '64 Belvedere
> > Woodstock, IL.
> > 
> > "The difference between ordinary and extraordinary is that little 
> > extra."
> 
> 
> 
> Jeff Adams
> 64 Polara



'64 Belvedere
Woodstock, IL.

"The difference between ordinary and extraordinary is that little 
extra."


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