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| Re: identifying a Cadillac "500" [message #237727 is a reply to message #237721] |
Mon, 27 January 2014 22:49   |
LarryInSanDiego
Messages: 336
Registered: September 2006
Karma: 0
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IIRC, the 425 S code block has some sort of "lump" sticking up around the distributor I had not seen in 472s and 500s. The 500 S code (and 472 T code) that I have seen do not have this. Also, the 425 has a single plane intake as opposed to the dual plane intake of the 472 and 500. This, of course, is assuming the engine is not a mutt build of parts of various motors. The 368 has very short (in height) exhaust ports. The 425 crank flange has more lightening notches than the 472 and 500 cranks. Maybe get a copy of how to identify Cadillac motors.
The above are merely my recollections and are not necessarily covering every application.
Larry Engelbrecht
San Diego, CA
'73 26' ex-Glacier
TZE063V100319 03/07/73
[Updated on: Mon, 27 January 2014 22:50] Report message to a moderator |
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| Re: identifying a Cadillac "500" [message #237809 is a reply to message #237800] |
Tue, 28 January 2014 11:59 |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
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| Dan Borlase wrote on Tue, 28 January 2014 11:08 |
Larry...thank you...this will be a big help !! I understand that the earlier years were more "preferred" though I'm not clear on why...Does anyone have any good reason why a 1975 would not work well in our coaches??
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Dan, you are welcome. Some say the early years are better, some say the later are. Personally, for our application I don't think it makes a particle bit of difference. You just cannot mix some parts from early to late and visa versa. Unless you want a high compression engine (10.5/1) and don't mind burning high test gas, you need to stay with the 71-76 engines. The 1970 472 and 500's had the 10/1 compression, so I'd avoid that one. The 70-76 472 and 500 eldos had the correct intake, and exhaust manifolds. Also had the correct oil pan. Only the 70-73 eldos had the correct motor mount. 500's from rear wheel drive Cad's will work, but you have to find the motor mount, exhaust and intake manifolds to make it work with our front wheel drive. If you can find a 71-73 eldo, IMO, that makes the best donor car. Has almost everything you need for the swap.
See this for more info:
http://www.gmcws.org/Tech/Caddy_Swap.pdf
Larry 
78 Royale w/500 Caddy
Menomonie, WI.
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| Re: [GMCnet] identifying a Cadillac "500" [message #237834 is a reply to message #237809] |
Tue, 28 January 2014 16:01 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Don,
Don't let the front motor mount be a deciding factor. IIRC, MTS sells a
suitable front mount. OR, it's easy to make your own. The one I made has
served me well for several years now -- and allows the use of your Olds
engine mount, which is probably in better shape than any Cad mount you'll
find (the Cad design holds oil on the rubber). It may even lower the
engine just tad. I haven't measured the difference, but I didn't raise
the hatch as much as most do.
http://www.gmcmhphotos.com/photos/g5259-cad-500.html
Oh yeah: Larry probably knows better than I, but I thought the 68-72 mount
was the one that works.
Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI & EBL
www.gmcwipersetc.com
On Tue, Jan 28, 2014 at 12:59 PM, Larry wrote:
>
>
> Dan Borlase wrote on Tue, 28 January 2014 11:08
> > Larry...thank you...this will be a big help !! I understand that the
> earlier years were more "preferred" though I'm not clear on why...Does
> anyone have any good reason why a 1975 would not work well in our coaches??
>
> ...
>
Only the 70-73 eldos had the correct motor mount.
>
...
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] identifying a Cadillac "500" [message #237853 is a reply to message #237834] |
Tue, 28 January 2014 18:30 |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
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Senior Member |
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| Ken Henderson wrote on Tue, 28 January 2014 16:01 |
Don,
Don't let the front motor mount be a deciding factor. IIRC, MTS sells a
suitable front mount. OR, it's easy to make your own.
http://www.gmcmhphotos.com/photos/g5259-cad-500.html
Oh yeah: Larry probably knows better than I, but I thought the 68-72 mount
was the one that works.
Ken H.
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Ken is right, it is the 68-72 mount that is the one you want. NOT the 73'. And it is The Cad Company in Alburquerque, New Mexico that has a mount for the 500 in a MH. MTS does not. It is not in their catalog, you have to call and ask about it. If you have the equipment and skills, Kens mount is the one you want. JMHO
Larry
78 Royale w/500 Caddy
Menomonie, WI.
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| Re: [GMCnet] identifying a Cadillac "500" [message #259813 is a reply to message #259807] |
Sat, 23 August 2014 10:19 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Bates,
Since I only received your one-sentence message, I can only assume that
"mount" refers to the CadCo front motor mount for the Cad500. If so, this
and following photos may help; they show the one I'm using, which allows
use of the Olds isolator, in the original crossmember holes:
http://www.gmcmhphotos.com/photos/cad-500/p32488-060-cad-500-front-mount-w-olds-rubber.html
The main reason I designed and built that mount was because the Olds
isolator ins inverted from that of the Cad -- it deflects oil away from the
rubber instead of collecting it. I saved the cost of having the Cad
isolator rebuilt -- immediately and frequently in the future.
Ken H.
On Sat, Aug 23, 2014 at 8:41 AM, Bates wrote:
> The Cad Company no longer sells this mount. Is there another source?
> _______________________________________________
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: identifying a Cadillac "500" [message #259842 is a reply to message #259838] |
Sat, 23 August 2014 16:38 |
djeffers
Messages: 219
Registered: June 2004
Karma: 2
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Senior Member |
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John Biwersi wrote on Sat, 23 August 2014 16:33I do have an original Cadillac Port injection manifold, throttle body, and fuel rails for the 472 and 500 Cadillac engines for sale.
Sending PM.
Don and Susan Jeffers
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