Home » Public Forums » GMCnet » Cadillac 500 Rocker Arm Stands (New Design Rocker Arm Stand for Cadillac 500 engines. )
| Cadillac 500 Rocker Arm Stands [message #298643] |
Tue, 05 April 2016 00:15  |
djeffers
Messages: 219
Registered: June 2004
Karma: 2
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Have these rocker arm stands been discussed on the GMCforum yet? They are on eBay for $44.99 per set.
http://www.ebay.com/itm/262362998710?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
Wolverine WG6090-8 Shaft Rocker Arm Pivot for Cadillac 368/425/472/500 (8/pkg)
These design of these rocker arm stands does away with the stock Cad 500 rocker arm stand stress concentration point that sometimes leads to stand breakage, popping out a lifter and immediate loss of oil pressure.
The fit should be no problem. The only question is metallurgy; are they compatible with the stock 500 rocker arms in the long term?
We have a set coming and will install them for evaluation.
Don and Susan Jeffers
78 Eleganza II Cad 500
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| Re: [GMCnet] Cadillac 500 Rocker Arm Stands [message #298652 is a reply to message #298643] |
Tue, 05 April 2016 06:33  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Don,
After having broken two OEM pedestals during my '13 trip to the west coast,
I changed to a rocker shaft system. That decision was reinforced by
Cad500's statement in their ad for similar new pedestals that they've seen
new ones fail. I'll never run the T-pedestals again. While my trouble was
with the arms themselves breaking off, I never really trusted the sheet
metal spring retainers either.
JMHO,
Ken H.
On Tue, Apr 5, 2016 at 1:15 AM, Don Jeffers
wrote:
> Have these rocker arm stands been discussed on the GMCforum yet? They are
> on eBay for $44.99 per set.
>
>
> http://www.ebay.com/itm/262362998710?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
>
> Wolverine WG6090-8 Shaft Rocker Arm Pivot for Cadillac 368/425/472/500
> (8/pkg)
>
> These design of these rocker arm stands does away with the stock Cad 500
> rocker arm stand stress concentration point that sometimes leads to stand
> breakage, popping out a lifter and immediate loss of oil pressure.
>
> The fit should be no problem. The only question is metallurgy; are they
> compatible with the stock 500 rocker arms in the long term?
>
> We have a set coming and will install them for evaluation.
>
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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: Cadillac 500 Rocker Arm Stands [message #298653 is a reply to message #298643] |
Tue, 05 April 2016 07:16 |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
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Senior Member |
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When I first built my engine, I used all of the original stock rocker parts, and ran them for 50-60K miles. During that time I sent oil samples to find that there was a little more iron in the oil than should be normal. Then on a trip to Florida, a valve stuck in the guide, hit a piston and bent the valve. I drove it home that way. When I pulled the heads, I found that most of the valve guides were worn excessively. The rockers had worn and were not hitting the valve tip squarely, pushing the valve sideways in the guide wearing them out. So I bought new OEM rockers and pedestals off of eBay, and rebuilt the heads with new guides. Then on a trip, one of the sheet metal retainers broke, rocker fell off, pushrod fell out and lifter popped out of the bore sending oil pressure to "0". That did it for the rods and mains. I did replace the whole rocker system with a bullet proof shaft system that I drove another 6K miles, but the Iron, aluminum and copper continued to build, so I am now in the process of replacing that whole engine. IMO, the pedestal type systems are the achilles heal of the Cad500. I would NOT use any of the pedestal type systems on the Cad 500. They may preform well for a while, but I don't think they can be trusted in the long hall. The shaft systems are expensive, but completely trouble free. Again, those pedestals may work just fine for a while, but ask yourself, do you really want potential trouble from these down the road? NOt worth the worry or potential troubles. JMHO.
Larry 
78 Royale w/500 Caddy
Menomonie, WI.
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| Re: [GMCnet] Cadillac 500 Rocker Arm Stands [message #298707 is a reply to message #298703] |
Tue, 05 April 2016 19:25 |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
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Senior Member |
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USAussie wrote on Tue, 05 April 2016 18:38G'day,
Since the Kingsley has a Caddy 500 in it I have been researching the aftermarket and have found the following shaft systems;
Sold by MTS:
http://www.500cid.com/#!product/prd1/4226777041/mts-shaft-rocker-system%28s%29
http://www.500cid.com/#!product/prd1/4226777281/mts-shaft-rocker-system%28s%29
http://www.500cid.com/#!product/prd1/3525907501/mts-shaft-rocker-system%28s%29
As you can see the photos of all three systems are identical. I called MTS and left a voicemail requesting clarification.
Sold by The Cad Co:
http://www.cad500parts.com/catalog/page20.htm
Questions:
Which system have other owners installed?
Regards,
Rob M.
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
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Yes, they used the same photo for all three systems. The most expensive one is fully adjustable...meaning that you can individually adjust preload for each lifter. The other two...IIRC are non adjusting, but can't remember the differences. I bought the fixed least expensive one. It is quite solid and preload adjustment is made using different length pushrods. If you set stem height to factory spec, only their standard length PR is required. If you are adding the shaft system to an existing running engine, depending on how far valves may have sunk into the head, you may need some different length PR's to get the preload into spec. Not hard to do as the spec is .025 to .080, so a minimum of different length PR's may be necessary to get what you want.
BTW, The Cad Company of Alburquerque NM has their own versions of the shaft systems.
http://www.cad500parts.com/catalog/page20.htm
Larry
78 Royale w/500 Caddy
Menomonie, WI.
[Updated on: Wed, 06 April 2016 07:00] Report message to a moderator |
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| Re: [GMCnet] Cadillac 500 Rocker Arm Stands [message #298710 is a reply to message #298703] |
Tue, 05 April 2016 19:31 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Rob,
I went with the CadCo Stage 1. Didn't see any advantage for anything more
complex and expensive in this application. I'm satisfied. I was a little
disappointed in their shim-the-pedestals method of adjusting lifter
preload, but it worked out OK. (In view of the wide tolerance on that
setting, I could probably have just bolted it together.)
Ken H.
On Tue, Apr 5, 2016 at 7:38 PM, Rob Mueller wrote:
> G'day,
>
> Since the Kingsley has a Caddy 500 in it I have been researching the
> aftermarket and have found the following shaft systems;
>
> Sold by MTS:
>
>
> http://www.500cid.com/#!product/prd1/4226777041/mts-shaft-rocker-system%28s%29
>
>
> http://www.500cid.com/#!product/prd1/4226777281/mts-shaft-rocker-system%28s%29
>
>
> http://www.500cid.com/#!product/prd1/3525907501/mts-shaft-rocker-system%28s%29
>
> As you can see the photos of all three systems are identical. I called MTS
> and left a voicemail requesting clarification.
>
> Sold by The Cad Co:
>
> http://www.cad500parts.com/catalog/page20.htm
>
> Questions:
>
> Which system have other owners installed?
>
> Regards,
> Rob M.
> USAussie - Downunder
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
>
>
>
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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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