>
> Now for a question: Most posts on engines I think are regarding the 455
> Olds engine. What about any experience in the 403 Chev(?) engine. How does
> one tell the difference. What should one look for that's different than
> with the 455?
Roger,
The 403 used in the 77 & 78 motorhomes is definitely an Oldsmobile
engine. There's a link on Gene Fisher's web page to the Olds FAQ that
explains how to tell the difference between the two. Easiest way to
tell is measure the width of the intake manifold - the 403's is
narrower. The exact dimension is on the aforementioned FAQ page. While
similar in dimensions to the 455, the 403 is referred to as a "small
block" olds engine. As far as performance goes, this has been pretty
well beaten to death so you might want to check the archives, but the
upshot is you won't really be able to tell much difference in
performance and you might get a little better gas mileage.
HTH,
Patrick
- --
Patrick Flowers
Mailto
atri63
The GMC Motorhome Page
http://www.gmcmotorhome.com
> Now for a question: Most posts on engines I think are regarding the 455
> Olds engine. What about any experience in the 403 Chev(?) engine. How does
> one tell the difference. What should one look for that's different than
> with the 455?
Roger,
The 403 used in the 77 & 78 motorhomes is definitely an Oldsmobile
engine. There's a link on Gene Fisher's web page to the Olds FAQ that
explains how to tell the difference between the two. Easiest way to
tell is measure the width of the intake manifold - the 403's is
narrower. The exact dimension is on the aforementioned FAQ page. While
similar in dimensions to the 455, the 403 is referred to as a "small
block" olds engine. As far as performance goes, this has been pretty
well beaten to death so you might want to check the archives, but the
upshot is you won't really be able to tell much difference in
performance and you might get a little better gas mileage.
HTH,
Patrick
- --
Patrick Flowers
Mailto
atri63The GMC Motorhome Page
http://www.gmcmotorhome.com
