Engine Power-Second Request

[ml3493]

I can't believe that there isn't some good person out there who knows
the horsepower and torque specs on GMC's 403 engine.

Last week I sent this message to the mailing list with no reply so far.

Does anyone have the horsepower and torque specs for the 403 engine? I
have specs for the 455 engine at 212 HP # 3400 RPM with max torque of
344 lbs ft # 2400 RPM. Going to look over a 77 Royale this weekend.

Clark Searle searlecj

 

[13]

Good Day

The 403 has 200hp at 3600 RPM with torque of 330 at 2400 RPM.
Compression for the 403 is 7.9 , Bore 4.351, and stroke 3.385.
My best mileage ever was "puttering" , if that's a word, around
Prince Edward Island this summer at speeds of 40 to 55mph on reg fuel
and liters converted to Imperial gallons, I'm Canadian eh!,
12.6 mpg.
Generally, I tow a VW Bug , with my 403, and average about 10.5 to 11
mpg (Imperial nor American).

Happy Motoring
Mike Beaton

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Persons at homebase
when they are not at "home" ____________
travel by /_|[_] [] [] |
GMC Motorhome :-O-------OO--*

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

 

[ml3493]

>
> Good Day
>
> The 403 has 200hp at 3600 RPM with torque of 330 at 2400 RPM.
> Compression for the 403 is 7.9 , Bore 4.351, and stroke 3.385.
> My best mileage ever was "puttering" , if that's a word, around
> Prince Edward Island this summer at speeds of 40 to 55mph on reg fuel
> and liters converted to Imperial gallons, I'm Canadian eh!,
> 12.6 mpg.
> Generally, I tow a VW Bug , with my 403, and average about 10.5 to 11
> mpg (Imperial nor American).
>
> Happy Motoring
> Mike Beaton
>
> XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
>
> Persons at homebase
> when they are not at "home" ____________
> travel by /_|[_] [] [] |
> GMC Motorhome :-O-------OO--*
>
> XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Thanks Mike. I wanted this info to do some calculations on the
different final drive ratios (3.07, 3.46, 3.50, 3.66) available. I've
been told that the 403 engine is a little weak, especially hill
climbing, but if you tow a Bug around, it can't be tto bad.
Thanks for the help.

Clark Searle

 

[12]

>

> >
> > Good Day
> >
> > The 403 has 200hp at 3600 RPM with torque of 330 at 2400 RPM.
> > Compression for the 403 is 7.9 , Bore 4.351, and stroke 3.385.
> > My best mileage ever was "puttering" , if that's a word, around
> > Prince Edward Island this summer at speeds of 40 to 55mph on reg fuel
> > and liters converted to Imperial gallons, I'm Canadian eh!,
> > 12.6 mpg.
> > Generally, I tow a VW Bug , with my 403, and average about 10.5 to 11
> > mpg (Imperial nor American).
> >
> > Happy Motoring
> > Mike Beaton
> >
> > XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
> >
> > Persons at homebase
> > when they are not at "home" ____________
> > travel by /_|[_] [] [] |
> > GMC Motorhome :-O-------OO--*
> >
> > XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
> Thanks Mike. I wanted this info to do some calculations on the
> different final drive ratios (3.07, 3.46, 3.50, 3.66) available. I've
> been told that the 403 engine is a little weak, especially hill
> climbing, but if you tow a Bug around, it can't be tto bad.
> Thanks for the help.
>
> Clark Searle
>
> .

I am not sure if the mpg was calculated on imerial or US gallons?? The
conversion factor is: 1 imperial gallon = 1.202 US gallons.

HR