Home » Public Forums » GMCnet » 455 From a 71 Oldsmobile (How compatible with my 77 Eleganza)
| 455 From a 71 Oldsmobile [message #161203] |
Wed, 22 February 2012 22:04  |
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Bob M
Messages: 100
Registered: August 2005
Location: Carlisle, PA
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How hard is it to take a complete 455 engine from a 1971 Oldsmobile and use it in my 77 Eleganza? I'm not referring to installation but to using it as it exists.
Bob Moss
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| Re: 455 From a 71 Oldsmobile [message #161205 is a reply to message #161203] |
Wed, 22 February 2012 22:10  |
Bob de Kruyff
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Registered: January 2004
Location: Chandler, AZ
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| Bob M wrote on Wed, 22 February 2012 21:04 |
How hard is it to take a complete 455 engine from a 1971 Oldsmobile and use it in my 77 Eleganza? I'm not referring to installation but to using it as it exists.
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Assuming it's not a Toronado, you'll have to switch oil pans and unless you want to raise the hatch, you will have to install the low rise intake manifold. The exhaust manifolds will also need to be switched.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] 455 From a 71 Oldsmobile [message #161217 is a reply to message #161205] |
Wed, 22 February 2012 23:57 |
jimk
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Registered: July 2006
Location: Belmont, CA
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You'll need to use another alternator bracket.
Highly suggest you pull out the distributor point and install the
Pertronic unit to get stronger spark.
On Wed, Feb 22, 2012 at 8:10 PM, Bob de Kruyff <NEXT2POOL@aol.com> wrote:
>
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> Bob M wrote on Wed, 22 February 2012 21:04
>> How hard is it to take a complete 455 engine from a 1971 Oldsmobile and use it in my 77 Eleganza? I'm not referring to installation but to using it as it exists.
>
> Assuming it's not a Toronado, you'll have to switch oil pans and unless you want to raise the hatch, you will have to install the low rise intake manifold. The exhaust manifolds will also need to be switched.
> --
> Bob de Kruyff
> 78 Eleganza
> Chandler, AZ
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Jim Kanomata
Applied/GMC, Fremont,CA
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| Re: [GMCnet] 455 From a 71 Oldsmobile [message #161281 is a reply to message #161246] |
Thu, 23 February 2012 19:25 |
Bob de Kruyff
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Registered: January 2004
Location: Chandler, AZ
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| ahamilto wrote on Thu, 23 February 2012 15:12 |
Where I was going with that question was, in addition to possibly changing the intake manifold (or building a doghouse over the breather), Bob M. might want to install a motorhome cam in his Toro engine.
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I didn't see any mention that this was a Toro engine, so it could be off one of many other models. Also, there is still speculation over what cams actually were in the motorhomes. Although I really like the website, it does contain many inaccuracies. In the case of the 403, I'm pretty sure the cam is the same on a M/H and other than marine engines, I'm suspicious of a specific cam on the 455 as well. I could be wrong as usual.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] 455 From a 71 Oldsmobile [message #161307 is a reply to message #161304] |
Thu, 23 February 2012 21:05 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
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| ahamilto wrote on Thu, 23 February 2012 20:00 |
| Bob de Kruyff wrote on Thu, 23 February 2012 19:25 |
I didn't see any mention that this was a Toro engine, so it could be off one of many other models. Also, there is still speculation over what cams actually were in the motorhomes. Although I really like the website, it does contain many inaccuracies. In the case of the 403, I'm pretty sure the cam is the same on a M/H and other than marine engines, I'm suspicious of a specific cam on the 455 as well. I could be wrong as usual.
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You are right. I just figured when he said Olds engine, it was a toronado.
So the question needs to be reworded. Is there a good chance that GMC used the same cam in the 73 - 78 motorhome as the model of Oldsmobile automobile that Bob M is asking about?
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I suspect that unless it was a hipo version that it will be unoticeable.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: 455 From a 71 Oldsmobile [message #161355 is a reply to message #161203] |
Fri, 24 February 2012 07:12 |
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Matt Colie
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Registered: March 2007
Location: S.E. Michigan
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| Bob M wrote on Wed, 22 February 2012 23:04 |
How hard is it to take a complete 455 engine from a 1971 Oldsmobile and use it in my 77 Eleganza? I'm not referring to installation but to using it as it exists.
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Bob,
The intake, oil pan and FEAD brackets have been covered. We all know that the carburetor was a special number, but some have made others work satisfactorily. As to the cam, given the manufacturing processes used in 1971, unless the engine is out of a 442, it is probably a plain-jane make it run cam. If you actually care, cams can be measured in place quite easily.
Personally, unless I had documented history of a forty one year old, I think I would start by doing a pretty complete tear-down inspection. Unless you are as well set up as KenH, getting engines in and out of a coach is a lot of work.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] 455 From a 71 Oldsmobile [message #161382 is a reply to message #161355] |
Fri, 24 February 2012 11:22 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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After 40 years of service, you couldn't determine the lift or duration that
the camshaft had originally. Or for that matter, the timing either. GM cams
of that era were known to be short lived things due to valve spring tension
as well as rocker arm ratios. With a 1.66 to 1 rocker arm ratio on a
monoball fulcrum, more lift is gained at the expense of camshaft lobe wear.
Just replace it and the lifters when you have it out, and change the timing
chain set with a full roller set, and what the heck, pull the heads and pan
and check the bearings, and valves and head gaskets while you are in there.
JWIWD.
Jim Hupy
Salem, OR
78 GMC Royale 403
On Fri, Feb 24, 2012 at 5:12 AM, Matt Colie <matt7323tze@gmail.com> wrote:
>
>
> Bob M wrote on Wed, 22 February 2012 23:04
> > How hard is it to take a complete 455 engine from a 1971 Oldsmobile and
> use it in my 77 Eleganza? I'm not referring to installation but to using it
> as it exists.
>
> Bob,
>
> The intake, oil pan and FEAD brackets have been covered. We all know that
> the carburetor was a special number, but some have made others work
> satisfactorily. As to the cam, given the manufacturing processes used in
> 1971, unless the engine is out of a 442, it is probably a plain-jane make
> it run cam. If you actually care, cams can be measured in place quite
> easily.
>
> Personally, unless I had documented history of a forty one year old, I
> think I would start by doing a pretty complete tear-down inspection.
> Unless you are as well set up as KenH, getting engines in and out of a
> coach is a lot of work.
>
> Matt
> --
> Matt & Mary Colie
> '73 Glacier 23 Chaumière (say show-me-air) Just about as stock as you will
> find
> SE Michigan - Twixt A2 and Detroit
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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